diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 00000000..1521c8b7
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1 @@
+dist
diff --git a/.eslintrc.js b/.eslintrc.js
index 5c8b7758..376253c3 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,346 +1,358 @@
+'use strict';
+
+const degreeOfComplexity = 20;
+
 module.exports = {
-	"env": {
-		"browser": true,
-		"jquery": true,
-		"node": true,
-		"amd": true
+	env : {
+		amd     : true,
+		browser : true,
+		jquery  : true,
+		node    : true
 	},
-	"parserOptions": {
-		"ecmaVersion": 5,
-		"sourceType": "script"
+	extends   : 'eslint:recommended',
+	overrides : [{
+		files : ['.eslintrc.js', 'Gruntfile.js'],
+		rules : {
+			strict : [
+				'warn',
+				'safe'
+			]
+		}
+	}],
+	parserOptions : {
+		ecmaVersion : 2015,
+		sourceType  : 'script'
 	},
-	"extends": "eslint:recommended",
-	"rules": {
-		"array-bracket-spacing": [
-			"warn",
-			"never"
-		],
-		"array-callback-return": "warn",
-		"arrow-body-style": "error",
-		"arrow-parens": "error",
-		"arrow-spacing": "error",
-		"block-scoped-var": "warn",
-		"block-spacing": [
-			"warn",
-			"always"
-		],
-		"brace-style": [
-			"error",
-			"1tbs"
-		],
-		"callback-return": "error",
-		"camelcase": [
-			"warn",
-			{ "properties": "always" }
-		],
-		"class-methods-use-this": "error",
-		"comma-dangle": [
-			"error",
-			"never"
-		],
-		"comma-spacing": "error",
-		"comma-style": "error",
-		"complexity": [
-			"warn",
-			20
-		],
-		"computed-property-spacing": "error",
-		"consistent-return": "error",
-		"consistent-this": [
-			"error",
-			"that",
-			"outerThis",
-			"self"
-		],
-		"curly": [
-			"error",
-			"all"
-		],
-		"default-case": "error",
-		"dot-location": [
-			"error",
-			"property"
-		],
-		"dot-notation": "error",
-		"eol-last": "error",
-		"eqeqeq": "error",
-		"func-call-spacing": "error",
-		"func-name-matching": "error",
-		"id-length": [
-			"warn",
-			{ "exceptions": ["$","e","i","j"] }
-		],
-		"indent": [
-			"error",
-			"tab"
-		],
-		"key-spacing": [
-			"warn", {
-				"singleLine": {
-					"beforeColon": false,
-					"afterColon": true
+	rules : {
+		'array-bracket-spacing' : [
+			'warn',
+			'never'
+		],
+		'array-callback-return' : 'warn',
+		'arrow-body-style'      : 'error',
+		'arrow-parens'          : 'error',
+		'arrow-spacing'         : 'error',
+		'block-scoped-var'      : 'warn',
+		'block-spacing'         : [
+			'warn',
+			'always'
+		],
+		'brace-style' : [
+			'error',
+			'1tbs'
+		],
+		'callback-return' : 'error',
+		'camelcase'       : [
+			'warn',
+			{allow: ['clk_x', 'clk_y'], properties: 'always'}
+		],
+		'class-methods-use-this' : 'error',
+		'comma-dangle'           : [
+			'error',
+			'never'
+		],
+		'comma-spacing' : 'error',
+		'comma-style'   : 'error',
+		'complexity'    : [
+			'warn',
+			degreeOfComplexity
+		],
+		'computed-property-spacing' : 'error',
+		'consistent-return'         : 'error',
+		'consistent-this'           : [
+			'error',
+			'that',
+			'outerThis',
+			'self'
+		],
+		'curly' : [
+			'error',
+			'all'
+		],
+		'default-case' : 'error',
+		'dot-location' : [
+			'error',
+			'property'
+		],
+		'dot-notation'       : 'error',
+		'eol-last'           : 'error',
+		'eqeqeq'             : 'error',
+		'func-call-spacing'  : 'error',
+		'func-name-matching' : 'error',
+		'id-length'          : [
+			'warn',
+			{exceptions: ['$', 'e', 'i', 'j'] }
+		],
+		'indent' : [
+			'error',
+			'tab'
+		],
+		'key-spacing' : [
+			'warn', {
+				multiLine : {
+					afterColon  : true,
+					align       : 'colon',
+					beforeColon : true
 				},
-				"multiLine": {
-					"beforeColon": true,
-					"afterColon": true,
-					"align": "colon"
+				singleLine : {
+					afterColon  : true,
+					beforeColon : false
 				}
 			}
 		],
-		"keyword-spacing": "error",
-		"linebreak-style": [
-			"warn",
-			"unix"
-		],
-		"max-depth": "warn",
-		"max-nested-callbacks": "error",
-		"max-params": [
-			"warn",
-			{ "max": 4 }
-		],
-		"max-statements": [
-			"warn",
-			{ "max": 20 }
-		],
-		"max-statements-per-line": [
-			"error",
-			{ "max": 2 }
-		],
-		"multiline-ternary": [
-			"error",
-			"never"
-		],
-		"new-parens": "error",
-		"newline-per-chained-call": [
-			"warn",
-			{ "ignoreChainWithDepth": 3 }
-		],
-		"no-alert": "error",
-		"no-array-constructor": "error",
-		"no-await-in-loop": "error",
-		"no-bitwise": "error",
-		"no-caller": "error",
-		"no-compare-neg-zero": "error",
-		"no-confusing-arrow": "error",
-		"no-continue": "warn",
-		"no-div-regex": "error",
-		"no-duplicate-imports": "error",
-		"no-else-return": [
-			"error",
-			{ "allowElseIf": false }
-		],
-		"no-empty": [
-			"error",
-			{ "allowEmptyCatch": true }
-		],
-		"no-empty-function": [
-			"error",
-			{ "allow": ["functions"] }
-		],
-		"no-eq-null": "error",
-		"no-eval": [
-			"error",
-			{ "allowIndirect": true }
-		],
-		"no-extend-native": "error",
-		"no-extra-bind": "error",
-		"no-extra-label": "error",
-		"no-extra-parens": [
-			"warn",
-			"all",
+		'keyword-spacing' : 'error',
+		'linebreak-style' : [
+			'warn',
+			'unix'
+		],
+		'max-depth'            : 'warn',
+		'max-nested-callbacks' : 'error',
+		'max-params'           : [
+			'warn',
+			{max: 4}
+		],
+		'max-statements' : [
+			'warn',
+			{max: 20}
+		],
+		'max-statements-per-line' : [
+			'error',
+			{max: 2}
+		],
+		'multiline-ternary' : [
+			'error',
+			'never'
+		],
+		'new-parens'               : 'error',
+		'newline-per-chained-call' : [
+			'warn',
+			{ignoreChainWithDepth: 3}
+		],
+		'no-alert'             : 'error',
+		'no-array-constructor' : 'error',
+		'no-await-in-loop'     : 'error',
+		'no-bitwise'           : 'error',
+		'no-caller'            : 'error',
+		'no-compare-neg-zero'  : 'error',
+		'no-confusing-arrow'   : 'error',
+		'no-continue'          : 'warn',
+		'no-div-regex'         : 'error',
+		'no-duplicate-imports' : 'error',
+		'no-else-return'       : [
+			'error',
+			{allowElseIf: false}
+		],
+		'no-empty' : [
+			'error',
+			{allowEmptyCatch: true}
+		],
+		'no-empty-function' : [
+			'error',
+			{allow: ['functions'] }
+		],
+		'no-eq-null' : 'error',
+		'no-eval'    : [
+			'error',
+			{allowIndirect: true}
+		],
+		'no-extend-native' : 'error',
+		'no-extra-bind'    : 'error',
+		'no-extra-label'   : 'error',
+		'no-extra-parens'  : [
+			'warn',
+			'all',
 			{
-				"returnAssign": false,
-				"nestedBinaryExpressions": false
+				nestedBinaryExpressions : false,
+				returnAssign            : false
 			}
 		],
-		"no-floating-decimal": "error",
-		"no-global-assign": "error",
-		"no-implicit-globals": "error",
-		"no-implied-eval": "error",
-		"no-inner-declarations": [
-			"warn",
-			"both"
-		],
-		"no-invalid-this": "warn",
-		"no-iterator": "error",
-		"no-label-var": "error",
-		"no-labels": "error",
-		"no-lone-blocks": "error",
-		"no-lonely-if": "error",
-		"no-loop-func": "error",
-		"no-magic-numbers": [
-			"warn",
+		'no-floating-decimal'   : 'error',
+		'no-global-assign'      : 'error',
+		'no-implicit-globals'   : 'error',
+		'no-implied-eval'       : 'error',
+		'no-inner-declarations' : [
+			'warn',
+			'both'
+		],
+		// 'no-invalid-this'  : 'warn', // Not practical for jQuery
+		'no-iterator'      : 'error',
+		'no-label-var'     : 'error',
+		'no-labels'        : 'error',
+		'no-lone-blocks'   : 'error',
+		'no-lonely-if'     : 'error',
+		'no-loop-func'     : 'error',
+		'no-magic-numbers' : [
+			'warn',
 			{
-				"ignore": [0,1],
-				"ignoreArrayIndexes": true
+				ignore             : [0, 1],
+				ignoreArrayIndexes : true
 			}
 		],
-		"no-mixed-operators": "error",
-		"no-mixed-requires": "error",
-		"no-multi-assign": "warn",
-		"no-multi-spaces": "error",
-		"no-multi-str": "error",
-		"no-multiple-empty-lines": [
-			"error",
+		'no-mixed-operators'      : 'error',
+		'no-mixed-requires'       : 'error',
+		'no-multi-assign'         : 'warn',
+		'no-multi-spaces'         : 'error',
+		'no-multi-str'            : 'error',
+		'no-multiple-empty-lines' : [
+			'error',
 			{
-				max: 2,
-				maxEOF: 1,
-				maxBOF: 0
+				max    : 2,
+				maxBOF : 0,
+				maxEOF : 1
 			}
 		],
-		"no-negated-condition": "warn",
-		"no-nested-ternary": "error",
-		"no-new": "error",
-		"no-new-func": "error",
-		"no-new-object": "error",
-		"no-new-require": "error",
-		"no-new-wrappers": "error",
-		"no-octal-escape": "error",
-		"no-path-concat": "error",
-		"no-process-env": "error",
-		"no-process-exit": "error",
-		"no-proto": "error",
-		"no-prototype-builtins": "warn",
-		"no-restricted-globals": "error",
-		"no-restricted-imports": "error",
-		"no-restricted-modules": "error",
-		"no-restricted-properties": "error",
-		"no-restricted-syntax": "error",
-		"no-return-assign": "error",
-		"no-return-await": "error",
-		"no-script-url": "error",
-		"no-self-compare": "error",
-		"no-sequences": "error",
-		"no-shadow": "warn",
-		"no-shadow-restricted-names": "error",
-		"no-sync": "warn",
-		"no-template-curly-in-string": "error",
-		"no-ternary": "warn",
-		"no-throw-literal": "warn",
-		"no-trailing-spaces": "error",
-		"no-undef-init": "error",
-		"no-undefined": "warn",
-		"no-underscore-dangle": "error",
-		"no-unmodified-loop-condition": "error",
-		"no-unneeded-ternary": "error",
-		"no-unsafe-negation": "error",
-		"no-unused-expressions": "error",
-		"no-unused-vars": [
-			"warn",
+		'no-negated-condition'         : 'warn',
+		'no-nested-ternary'            : 'error',
+		'no-new'                       : 'error',
+		'no-new-func'                  : 'error',
+		'no-new-object'                : 'error',
+		'no-new-require'               : 'error',
+		'no-new-wrappers'              : 'error',
+		'no-octal-escape'              : 'error',
+		'no-path-concat'               : 'error',
+		'no-process-env'               : 'error',
+		'no-process-exit'              : 'error',
+		'no-proto'                     : 'error',
+		'no-prototype-builtins'        : 'warn',
+		'no-restricted-globals'        : 'error',
+		'no-restricted-imports'        : 'error',
+		'no-restricted-modules'        : 'error',
+		'no-restricted-properties'     : 'error',
+		'no-restricted-syntax'         : 'error',
+		'no-return-assign'             : 'error',
+		'no-return-await'              : 'error',
+		'no-script-url'                : 'error',
+		'no-self-compare'              : 'error',
+		'no-sequences'                 : 'error',
+		'no-shadow'                    : 'warn',
+		'no-shadow-restricted-names'   : 'error',
+		'no-sync'                      : 'warn',
+		'no-template-curly-in-string'  : 'error',
+		// 'no-ternary'                   : 'warn',
+		'no-throw-literal'             : 'warn',
+		'no-trailing-spaces'           : 'error',
+		'no-undef-init'                : 'error',
+		'no-underscore-dangle'         : 'error',
+		'no-unmodified-loop-condition' : 'error',
+		'no-unneeded-ternary'          : 'error',
+		'no-unsafe-negation'           : 'error',
+		'no-unused-expressions'        : 'error',
+		'no-unused-vars'               : [
+			'warn',
 			{
-				"vars": "local",
-				"args": "none"
+				args : 'none',
+				vars : 'local'
 			}
 		],
-		"no-use-before-define": [
-			"error",
+		'no-use-before-define' : [
+			'error',
 			{
-				"functions": false
+				functions : false
 			}
 		],
-		"no-useless-call": "error",
-		"no-useless-computed-key": "error",
-		"no-useless-concat": "error",
-		"no-useless-constructor": "error",
-		"no-useless-escape": "error",
-		"no-useless-rename": "error",
-		"no-useless-return": "error",
-		"no-var": "warn",
-		"no-void": "error",
-		"no-warning-comments": "warn",
-		"no-whitespace-before-property": "error",
-		"no-with": "error",
-		"nonblock-statement-body-position": "error",
-		"object-curly-newline": "error",
-		"object-curly-spacing": [
-			"error",
-			"never",
+		'no-useless-call'                  : 'error',
+		'no-useless-computed-key'          : 'error',
+		'no-useless-concat'                : 'error',
+		'no-useless-constructor'           : 'error',
+		'no-useless-escape'                : 'error',
+		'no-useless-rename'                : 'error',
+		'no-useless-return'                : 'error',
+		'no-var'                           : 'warn',
+		'no-void'                          : 'error',
+		'no-warning-comments'              : 'warn',
+		'no-whitespace-before-property'    : 'error',
+		'no-with'                          : 'error',
+		'nonblock-statement-body-position' : 'error',
+		'object-curly-newline'             : 'error',
+		'object-curly-spacing'             : [
+			'error',
+			'never',
 			{
-				"arraysInObjects": true,
-				"objectsInObjects": true
+				arraysInObjects  : true,
+				objectsInObjects : true
 			}
 		],
-		"object-property-newline": [
-			"error",
+		'object-property-newline' : [
+			'error',
 			{
-				"allowMultiplePropertiesPerLine": true
+				allowMultiplePropertiesPerLine : true
 			}
 		],
-		"object-shorthand": [
-			"warn",
-			"consistent"
-		],
-		"operator-assignment": [
-			"error",
-			"always"
-		],
-		"operator-linebreak": "error",
-		"padding-line-between-statements": [
-			"warn",
-			{ "blankLine": "always", "prev": ["const", "let", "var"], "next": "*"},
-			{ "blankLine": "any", "prev": ["const", "let", "var"], "next": ["const", "let", "var"]},
-			{ "blankLine": "always", "prev": "directive", "next": "*" },
-			{ "blankLine": "any", "prev": "directive", "next": "directive" },
-			{ "blankLine": "always", "prev": "*", "next": "return" }
-		],
-		"prefer-const": "error",
-		"prefer-promise-reject-errors": "error",
-		"quote-props": [
-			"warn",
-			"consistent-as-needed"
-		],
-		"quotes": [
-			"error",
-			"single",
+		'object-shorthand' : [
+			'warn',
+			'consistent'
+		],
+		'operator-assignment' : [
+			'error',
+			'always'
+		],
+		'operator-linebreak'              : 'error',
+		'padding-line-between-statements' : [
+			'warn',
+			{blankLine: 'always', next: '*', prev: ['const', 'let', 'var'] },
+			{blankLine: 'any', next: ['const', 'let', 'var'], prev: ['const', 'let', 'var'] },
+			{blankLine: 'always', next: '*', prev: 'directive'},
+			{blankLine: 'any', next: 'directive', prev: 'directive'},
+			{blankLine: 'always', next: 'return', prev: '*'}
+		],
+		'prefer-const'                 : 'error',
+		'prefer-promise-reject-errors' : 'error',
+		'quote-props'                  : [
+			'warn',
+			'consistent-as-needed'
+		],
+		'quotes' : [
+			'error',
+			'single',
 			{
-				"avoidEscape": true,
-				"allowTemplateLiterals": true
+				allowTemplateLiterals : true,
+				avoidEscape           : true
 			}
 		],
-		"radix": "error",
-		"require-await": "error",
-		"rest-spread-spacing": "error",
-		"semi": [
-			"error",
-			"always"
-		],
-		"semi-spacing": "error",
-		"sort-imports": "error",
-		"sort-keys": "warn",
-		"sort-vars": "warn",
-		"space-before-blocks": "warn",
-		"space-before-function-paren": [
-			"warn",
+		'radix'               : 'error',
+		'require-await'       : 'error',
+		'rest-spread-spacing' : 'error',
+		'semi'                : [
+			'error',
+			'always'
+		],
+		'semi-spacing'                : 'error',
+		'sort-imports'                : 'error',
+		'sort-keys'                   : 'warn',
+		'sort-vars'                   : 'warn',
+		'space-before-blocks'         : 'warn',
+		'space-before-function-paren' : [
+			'warn',
 			{
-				"anonymous": "ignore",
-				"named": "never",
-				"asyncArrow": "ignore"
+				anonymous  : 'ignore',
+				asyncArrow : 'ignore',
+				named      : 'never'
 			}
 		],
-		"space-in-parens": "warn",
-		"space-infix-ops": "error",
-		"space-unary-ops": "error",
-		"spaced-comment": ["error", "always", {
-			"line": {
-				"markers": ["/"],
-				"exceptions": ["-", "+"]
+		'space-in-parens' : 'warn',
+		'space-infix-ops' : 'error',
+		'space-unary-ops' : 'error',
+		'spaced-comment'  : ['error', 'always', {
+			block : {
+				balanced   : true,
+				exceptions : ['*'],
+				markers    : ['!']
 			},
-			"block": {
-				"markers": ["!"],
-				"exceptions": ["*"],
-				"balanced": true
+			line : {
+				exceptions : ['-', '+'],
+				markers    : ['/']
 			}
 		}],
-		"strict": [
-			"warn",
-			"function"
-		],
-		"template-curly-spacing": "error",
-		"template-tag-spacing": "error",
-		"unicode-bom": "error",
-		"vars-on-top": "warn",
-		"wrap-iife": "error",
-		"yield-star-spacing": "error",
-		"yoda": "error"
+		'strict' : [
+			'warn',
+			'function'
+		],
+		'template-curly-spacing' : 'error',
+		'template-tag-spacing'   : 'error',
+		'unicode-bom'            : 'error',
+		'vars-on-top'            : 'warn',
+		'wrap-iife'              : 'error',
+		'yield-star-spacing'     : 'error',
+		'yoda'                   : 'error'
 	}
 };
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a603da09..5eeb5a87 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -33,7 +33,7 @@ Here are a couple of guidelines that will help you contribute. Before we get sta
     ```shell
     $ git commit -m "A brief summary of the commit"
     >
-    > A paragraph describing what changed and its impact."
+    > A paragraph describing what changed and its impact.
     ```
   * If your PR fixes a separate issue number, include it in the commit message.
 
diff --git a/Gruntfile.js b/Gruntfile.js
index 926abb55..ea517de9 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,57 +1,60 @@
+'use strict';
+
 module.exports = function(grunt) {
 	grunt.initConfig({
-		pkg: grunt.file.readJSON('package.json'),
-		meta: {
-			banner: '/*! <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd HH:MM:ss") %> */'
+		eslint : {
+			options : {
+				quiet : true
+			},
+			target : ['src/**/*.js']
 		},
 
-		githooks: {
-			options: {
-				hashbang: '#!/bin/sh',
-				template: 'install/template/shell.hb',
-				startMarker: '# GRUNT-GITHOOKS START',
-				endMarker: '# GRUNT-GITHOOKS END'
+		githooks : {
+			all : {
+				'pre-commit' : 'pre-commit'
 			},
-			all: {
-				'pre-commit': 'pre-commit'
+			options : {
+				endMarker   : '# GRUNT-GITHOOKS END',
+				hashbang    : '#!/bin/sh',
+				startMarker : '# GRUNT-GITHOOKS START',
+				template    : 'install/template/shell.hb'
 			}
 		},
 
-		eslint: {
-			options: {
-				quiet: true
-			},
-			target: ['src/**/*.js']
+		meta : {
+			banner : '/*! <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd HH:MM:ss") %> */'
 		},
 
-		mocha: {
-			all: {
-				src: ['test/*.html']
+		mocha : {
+			all : {
+				src : ['test/*.html']
 			},
-			options: {
-				run: true,
-				growlOnSuccess: false
+			options : {
+				growlOnSuccess : false,
+				run            : true
 			}
 		},
 
+		pkg : grunt.file.readJSON('package.json'),
+
 		// Minifies JS files
-		uglify: {
-			options: {
-				output: {
-					comments: /^!|@preserve|@license|@cc_on/i
-				},
-				sourceMap: true,
-				footer: '\n'
-			},
-			dist: {
-				files: [{
-					expand:	true,
-					cwd:	'src',
-					src:	['*.js','!*.min.js'],
-					dest:	'dist',
-					ext:	'.min.js',
-					extDot:	'last'
+		uglify : {
+			dist : {
+				files : [{
+					cwd    :	'src',
+					dest   :	'dist',
+					expand :	true,
+					ext    :	'.min.js',
+					extDot :	'last',
+					src    :	['*.js', '!*.min.js']
 				}]
+			},
+			options : {
+				footer : '\n',
+				output : {
+					comments : /^!|@preserve|@license|@cc_on/i
+				},
+				sourceMap : true
 			}
 		}
 	});
@@ -63,8 +66,8 @@ module.exports = function(grunt) {
 	grunt.loadNpmTasks('grunt-githooks');
 
 	// Default task.
-	grunt.registerTask('lint', [ 'eslint' ]);
-	grunt.registerTask('test', [ 'lint', 'mocha' ]);
-	grunt.registerTask('pre-commit', [ 'test' ]);
-	grunt.registerTask('default', [ 'test', 'uglify' ]);
+	grunt.registerTask('lint', ['eslint']);
+	grunt.registerTask('test', ['lint', 'mocha']);
+	grunt.registerTask('pre-commit', ['test']);
+	grunt.registerTask('default', ['test', 'uglify']);
 };
diff --git a/README.md b/README.md
index e506fc09..031e54b3 100644
--- a/README.md
+++ b/README.md
@@ -47,8 +47,8 @@ The jqXHR object is stored in element <em>data</em>-cache with the <code>jqxhr</
 call. It can be accessed like this:
 
 ````javascript
-var form = $('#myForm').ajaxSubmit({ /* options */ });
-var xhr = form.data('jqxhr');
+const form = $('#myForm').ajaxSubmit({ /* options */ });
+const xhr = form.data('jqxhr');
 
 xhr.done(function() {
 ...
@@ -89,7 +89,7 @@ $('form').on('submit', function(e) {
 Callback function invoked before form serialization. Provides an opportunity to manipulate the form before its values are retrieved. Returning `false` from the callback will prevent the form from being submitted. The callback is invoked with two arguments: the jQuery wrapped form object and the options object.
 
 ````javascript
-beforeSerialize: function($form, options) {
+beforeSerialize ($form, options) {
     // return false to cancel submit
 }
 ````
@@ -98,7 +98,7 @@ beforeSerialize: function($form, options) {
 Callback function invoked before form submission. Returning `false` from the callback will prevent the form from being submitted. The callback is invoked with three arguments: the form data in array format, the jQuery wrapped form object, and the options object.
 
 ````javascript
-beforeSubmit: function(arr, $form, options) {
+beforeSubmit (arr, $form, options) {
     // form data array is an array of objects with name and value properties
     // [ { name: 'username', value: 'jresig' }, { name: 'password', value: 'secret' } ]
     // return false to cancel submit
@@ -109,7 +109,7 @@ beforeSubmit: function(arr, $form, options) {
 Callback function invoked before form events unbind and bind again. Provides an opportunity to manipulate the form before events will be remounted. The callback is invoked with two arguments: the jQuery wrapped form object and the options object.
 
 ````javascript
-beforeFormUnbind: function($form, options) {
+beforeFormUnbind ($form, options) {
     // your callback code
 }
 ````
@@ -118,7 +118,7 @@ beforeFormUnbind: function($form, options) {
 Callback function invoked before processing fields. This provides a way to filter elements.
 
 ````javascript
-filtering: function(el, index) {
+filtering (el, index) {
     if ( !$(el).hasClass('ignore') ) {
         return el;
     }
@@ -216,14 +216,14 @@ URL to which the form data will be submitted.
 Serializes the form into a query string. This method will return a string in the format: `name1=value1&name2=value2`
 
 ````javascript
-var queryString = $('#myFormId').formSerialize();
+const queryString = $('#myFormId').formSerialize();
 ````
 
 ### fieldSerialize
 Serializes field elements into a query string. This is handy when you need to serialize only part of a form. This method will return a string in the format: `name1=value1&name2=value2`
 
 ````javascript
-var queryString = $('#myFormId .specialFields').fieldSerialize();
+const queryString = $('#myFormId .specialFields').fieldSerialize();
 ````
 
 ### fieldValue
diff --git a/docs/_layouts/default.html b/docs/_layouts/default.html
index 66491228..90ff3fee 100644
--- a/docs/_layouts/default.html
+++ b/docs/_layouts/default.html
@@ -3,7 +3,7 @@
   <head>
 	<meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="chrome=1">
-    <link href='https://fonts.googleapis.com/css?family=Chivo:900' rel='stylesheet' type='text/css'>
+    <link href="https://fonts.googleapis.com/css?family=Chivo:900" rel="stylesheet" type="text/css">
     <link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}">
     <link rel="stylesheet" type="text/css" href="{{ '/assets/css/print.css' | relative_url }}" media="print">
     <!--[if lt IE 9]>
@@ -33,12 +33,12 @@ <h2>{{ site.description | default: site.github.project_tagline }}</h2>
 
 		<nav>
 			<ul>
-				<li class="{% if page.url == "/" %}active{% endif %}"><a href="{{ site.baseurl }}/">Getting Started</a></li>
-				<li class="{% if page.url == "/api/" %}active{% endif %}"><a href="{{ site.baseurl }}/api/">API</a></li>
-				<li class="{% if page.url == "/options/" %}active{% endif %}"><a href="{{ site.baseurl }}/options/">Options</a></li>
-				<li class="{% if page.url == "/examples/" %}active{% endif %}"><a href="{{ site.baseurl }}/examples/">Examples</a></li>
-				<li class="{% if page.url == "/form-fields/" %}active{% endif %}"><a href="{{ site.baseurl }}/form-fields/">Form Fields</a></li>
-				<li class="{% if page.url == "/faq/" %}active{% endif %}"><a href="{{ site.baseurl }}/faq/">FAQ</a></li>
+				<li class="{% if page.url == '/' %}active{% endif %}"><a href="{{ site.baseurl }}/">Getting Started</a></li>
+				<li class="{% if page.url == '/api/' %}active{% endif %}"><a href="{{ site.baseurl }}/api/">API</a></li>
+				<li class="{% if page.url == '/options/' %}active{% endif %}"><a href="{{ site.baseurl }}/options/">Options</a></li>
+				<li class="{% if page.url == '/examples/' %}active{% endif %}"><a href="{{ site.baseurl }}/examples/">Examples</a></li>
+				<li class="{% if page.url == '/form-fields/' %}active{% endif %}"><a href="{{ site.baseurl }}/form-fields/">Form Fields</a></li>
+				<li class="{% if page.url == '/faq/' %}active{% endif %}"><a href="{{ site.baseurl }}/faq/">FAQ</a></li>
 				<li><a href="{{ site.github.repository_url | replace_first: 'http:', 'https:' }}#download">Download</a></li>
 			</ul>
 		</nav>
diff --git a/package-lock.json b/package-lock.json
index 503290a2..aae8939b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,51 +5,29 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.10.1",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.1.tgz",
-      "integrity": "sha512-IGhtTmpjGbYzcEDOw7DcQtbQSXcG9ftmAXtWTu9V936vDye4xjjekktFAtgZsWpzTj/X01jocB46mTywm/4SZw==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "^7.10.1"
+        "@babel/highlight": "^7.10.4"
       }
     },
     "@babel/helper-validator-identifier": {
-      "version": "7.10.1",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.1.tgz",
-      "integrity": "sha512-5vW/JXLALhczRCWP0PnFDMCJAchlBvM7f4uk/jXritBnIa6E1KmqmtrS3yn1LAnxFBypQ3eneLuXjsnfQsgILw==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
       "dev": true
     },
     "@babel/highlight": {
-      "version": "7.10.1",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.1.tgz",
-      "integrity": "sha512-8rMof+gVP8mxYZApLF/JgNDAkdKa+aJt3ZYxF8z6+j/hpeXL7iMsKCPHa2jNMHu/qqBwzQF4OHNoYi8dMA/rYg==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
       "dev": true,
       "requires": {
-        "@babel/helper-validator-identifier": "^7.10.1",
+        "@babel/helper-validator-identifier": "^7.10.4",
         "chalk": "^2.0.0",
         "js-tokens": "^4.0.0"
-      },
-      "dependencies": {
-        "ansi-styles": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^1.9.0"
-          }
-        },
-        "chalk": {
-          "version": "2.4.2",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^3.2.1",
-            "escape-string-regexp": "^1.0.5",
-            "supports-color": "^5.3.0"
-          }
-        }
       }
     },
     "@types/color-name": {
@@ -59,15 +37,15 @@
       "dev": true
     },
     "abbrev": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.0.tgz",
-      "integrity": "sha1-0FVMIlZjbi9W58LlrRg/hZQo2B8=",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
       "dev": true
     },
     "acorn": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.2.0.tgz",
-      "integrity": "sha512-apwXVmYVpQ34m/i71vrApRrRKCWQnZZF1+npOD0WV5xZFfwWOmKGQ2RWlfdy9vWITsenisM8M0Qeq8agcFHNiQ==",
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
+      "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
       "dev": true
     },
     "acorn-jsx": {
@@ -77,48 +55,23 @@
       "dev": true
     },
     "ajv": {
-      "version": "6.12.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.2.tgz",
-      "integrity": "sha512-k+V+hzjm5q/Mr8ef/1Y9goCmlsK4I6Sm74teeyGvFk1XrOsbsKLjEdrvny42CZ+a8sXbk8KWpY/bDwS+FLL2UQ==",
+      "version": "6.12.3",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.3.tgz",
+      "integrity": "sha512-4K0cK3L1hsqk9xIb2z9vs/XU+PGJZ9PNpJRDS9YLzmNdX6jmVPfamLvTJr0aDAusnHyCHO6MjzlkAsgtqp9teA==",
       "dev": true,
       "requires": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
         "json-schema-traverse": "^0.4.1",
         "uri-js": "^4.2.2"
-      },
-      "dependencies": {
-        "fast-deep-equal": {
-          "version": "3.1.1",
-          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.1.tgz",
-          "integrity": "sha512-8UEa58QDLauDNfpbrX55Q9jrGHThw2ZMdOky5Gl1CDtVeJDPVrG4Jxx1N8jw2gkWaff5UUuX1KJd+9zGe2B+ZA==",
-          "dev": true
-        }
       }
     },
     "ansi-colors": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
-      "integrity": "sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
       "dev": true
     },
-    "ansi-escapes": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
-      "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
-      "dev": true,
-      "requires": {
-        "type-fest": "^0.11.0"
-      },
-      "dependencies": {
-        "type-fest": {
-          "version": "0.11.0",
-          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
-          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
-          "dev": true
-        }
-      }
-    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -151,14 +104,6 @@
       "dev": true,
       "requires": {
         "sprintf-js": "~1.0.2"
-      },
-      "dependencies": {
-        "sprintf-js": {
-          "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-          "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
-          "dev": true
-        }
       }
     },
     "arr-diff": {
@@ -185,12 +130,6 @@
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
       "dev": true
     },
-    "array-find-index": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
-      "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
-      "dev": true
-    },
     "array-slice": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
@@ -261,9 +200,9 @@
       "dev": true
     },
     "aws4": {
-      "version": "1.8.0",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
-      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.10.0.tgz",
+      "integrity": "sha512-3YDiu347mtVtjpyV3u5kVqQLP242c06zwDOgpeRnybmXlYYsLbtTrUBUm8i8srONt+FWobl5aibnU1030PeeuA==",
       "dev": true
     },
     "balanced-match": {
@@ -337,9 +276,9 @@
       }
     },
     "binary-extensions": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
-      "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.1.0.tgz",
+      "integrity": "sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==",
       "dev": true
     },
     "brace-expansion": {
@@ -387,18 +326,18 @@
       "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
       "dev": true
     },
+    "buffer-crc32": {
+      "version": "0.2.13",
+      "resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
+      "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=",
+      "dev": true
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
       "dev": true
     },
-    "buffer-shims": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz",
-      "integrity": "sha1-mXjOMXOIxkmth5MCjDR37wRKi1E=",
-      "dev": true
-    },
     "cache-base": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
@@ -423,21 +362,11 @@
       "dev": true
     },
     "camelcase": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
-      "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
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     },
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-      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
+      "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
       "dev": true,
       "requires": {
-        "psl": "^1.1.24",
-        "punycode": "^1.4.1"
-      },
-      "dependencies": {
-        "punycode": {
-          "version": "1.4.1",
-          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
-          "dev": true
-        }
+        "psl": "^1.1.28",
+        "punycode": "^2.1.1"
       }
     },
-    "trim-newlines": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
-      "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
-      "dev": true
-    },
-    "tslib": {
-      "version": "1.13.0",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
-      "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
-      "dev": true
-    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -4613,13 +3771,10 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.9.4",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.4.tgz",
-      "integrity": "sha512-8RZBJq5smLOa7KslsNsVcSH+KOXf1uDU8yqLeNuVKwmT0T3FA0ZoXlinQfRad7SDcbZZRZE4ov+2v71EnxNyCA==",
-      "dev": true,
-      "requires": {
-        "commander": "~2.20.3"
-      }
+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.10.0.tgz",
+      "integrity": "sha512-Esj5HG5WAyrLIdYU74Z3JdG2PxdIusvj6IWHMtlyESxc7kcDz7zYlYjpnSokn1UbpV0d/QX9fan7gkCNd/9BQA==",
+      "dev": true
     },
     "unc-path-regex": {
       "version": "0.1.2",
@@ -4723,9 +3878,9 @@
       "dev": true
     },
     "uuid": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
       "dev": true
     },
     "v8-compile-cache": {
@@ -4735,24 +3890,14 @@
       "dev": true
     },
     "v8flags": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.2.tgz",
-      "integrity": "sha512-MtivA7GF24yMPte9Rp/BWGCYQNaUj86zeYxV/x2RRJMKagImbbv3u8iJC57lNhWLPcGLJmHcHmFWkNsplbbLWw==",
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.3.tgz",
+      "integrity": "sha512-amh9CCg3ZxkzQ48Mhcb8iX7xpAfYJgePHxWMQCBWECpOSqJUXgY26ncA61UTV0BkPqfhcy6mzwCIoP4ygxpW8w==",
       "dev": true,
       "requires": {
         "homedir-polyfill": "^1.0.1"
       }
     },
-    "validate-npm-package-license": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
-      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
-      "dev": true,
-      "requires": {
-        "spdx-correct": "^3.0.0",
-        "spdx-expression-parse": "^3.0.0"
-      }
-    },
     "verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
@@ -4765,9 +3910,9 @@
       }
     },
     "which": {
-      "version": "1.2.14",
-      "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
-      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
       "dev": true,
       "requires": {
         "isexe": "^2.0.0"
@@ -4786,39 +3931,6 @@
       "dev": true,
       "requires": {
         "string-width": "^1.0.2 || 2"
-      },
-      "dependencies": {
-        "ansi-regex": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
-          "dev": true
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        },
-        "string-width": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
-          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
-          "dev": true,
-          "requires": {
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^4.0.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
-          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^3.0.0"
-          }
-        }
       }
     },
     "word-wrap": {
@@ -4844,27 +3956,6 @@
           "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
           "dev": true
         },
-        "ansi-styles": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^1.9.0"
-          }
-        },
-        "emoji-regex": {
-          "version": "7.0.3",
-          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
-          "dev": true
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -4900,17 +3991,6 @@
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
-      },
-      "dependencies": {
-        "mkdirp": {
-          "version": "0.5.5",
-          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
-          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
-          "dev": true,
-          "requires": {
-            "minimist": "^1.2.5"
-          }
-        }
       }
     },
     "y18n": {
@@ -4943,27 +4023,6 @@
           "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
           "dev": true
         },
-        "emoji-regex": {
-          "version": "7.0.3",
-          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
-          "dev": true
-        },
-        "find-up": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
-          "dev": true,
-          "requires": {
-            "locate-path": "^3.0.0"
-          }
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -4994,14 +4053,6 @@
       "requires": {
         "camelcase": "^5.0.0",
         "decamelize": "^1.2.0"
-      },
-      "dependencies": {
-        "camelcase": {
-          "version": "5.3.1",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
-          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
-          "dev": true
-        }
       }
     },
     "yargs-unparser": {
@@ -5016,12 +4067,13 @@
       }
     },
     "yauzl": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.4.1.tgz",
-      "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
       "dev": true,
       "requires": {
-        "fd-slicer": "~1.0.1"
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
       }
     }
   }
diff --git a/package.json b/package.json
index e412a8e9..5135aecf 100644
--- a/package.json
+++ b/package.json
@@ -26,11 +26,19 @@
     "type": "git",
     "url": "https://github.com/jquery-form/form.git"
   },
+  "scripts": {
+    "lint": "eslint --report-unused-disable-directives .",
+    "test": "grunt test"
+  },
+  "engines": {
+    "node": ">=8.0.0"
+  },
   "dependencies": {
-    "jquery": ">=1.7.2"
+    "jquery": ">=1.9.1"
   },
   "devDependencies": {
     "chai": "^4.2.0",
+    "eslint": "^7.4.0",
     "grunt": "^1.1.0",
     "grunt-cli": "^1.3.2",
     "grunt-contrib-uglify": "^4.0.1",
diff --git a/src/jquery.form.js b/src/jquery.form.js
index 168d4b8b..c18d0d30 100644
--- a/src/jquery.form.js
+++ b/src/jquery.form.js
@@ -21,25 +21,25 @@
  */
 /* global ActiveXObject */
 
-/* eslint-disable */
+/* eslint-disable strict, max-statements */
 (function (factory) {
 	if (typeof define === 'function' && define.amd) {
 		// AMD. Register as an anonymous module.
 		define(['jquery'], factory);
 	} else if (typeof module === 'object' && module.exports) {
 		// Node/CommonJS
-		module.exports = function( root, jQuery ) {
+		module.exports = function(root, jQuery) {
 			if (typeof jQuery === 'undefined') {
 				// require('jQuery') returns a factory that requires window to build a jQuery instance, we normalize how we use modules
 				// that require this pattern but the window provided is a noop if it's defined (how jquery works)
-				if (typeof window !== 'undefined') {
-					jQuery = require('jquery');
-				}
-				else {
+				if (typeof window === 'undefined') {
 					jQuery = require('jquery')(root);
+				} else {
+					jQuery = require('jquery');
 				}
 			}
 			factory(jQuery);
+
 			return jQuery;
 		};
 	} else {
@@ -48,7 +48,7 @@
 	}
 
 }(function ($) {
-/* eslint-enable */
+	/* eslint-enable strict, max-statements */
 	'use strict';
 
 	/*
@@ -88,17 +88,27 @@
 		at the appropriate time.
 	*/
 
-	var rCRLF = /\r?\n/g;
+	const rCRLF = /\r?\n/g;
+
+	const SUCCESS = 200;
+	const REDIRECT = 300;
+	const NOT_MODIFIED = 304;
+
+	const MULTIPART = 'multipart/form-data';
+
+	const hasOwn = function (obj, prop) {
+		return {}.hasOwnProperty.call(obj, prop);
+	};
 
 	/**
 	 * Feature detection
 	 */
-	var feature = {};
+	const feature = {};
 
 	feature.fileapi = $('<input type="file">').get(0).files !== undefined;
-	feature.formdata = (typeof window.FormData !== 'undefined');
+	feature.formdata = typeof window.FormData !== 'undefined';
 
-	var hasProp = !!$.fn.prop;
+	const hasProp = !!$.fn.prop;
 
 	// attr2 uses prop when it can but checks the return type for
 	// an expected string. This accounts for the case where a form
@@ -109,7 +119,7 @@
 			return this.attr.apply(this, arguments);
 		}
 
-		var val = this.prop.apply(this, arguments);
+		const val = this.prop.apply(this, arguments);
 
 		if ((val && val.jquery) || typeof val === 'string') {
 			return val;
@@ -118,6 +128,7 @@
 		return this.attr.apply(this, arguments);
 	};
 
+	/* eslint-disable complexity, max-statements */
 	/**
 	 * ajaxSubmit() provides a mechanism for immediately submitting
 	 * an HTML form using AJAX.
@@ -136,16 +147,16 @@
 		}
 
 		/* eslint consistent-this: ["error", "$form"] */
-		var method, action, url, isMsie, iframeSrc, $form = this;
+		const $form = this;
 
 		if (typeof options === 'function') {
 			options = {success: options};
 
 		} else if (typeof options === 'string' || (options === false && arguments.length > 0)) {
 			options = {
-				'url'      : options,
-				'data'     : data,
-				'dataType' : dataType
+				data     : data,
+				dataType : dataType,
+				url      : options
 			};
 
 			if (typeof onSuccess === 'function') {
@@ -156,10 +167,11 @@
 			options = {};
 		}
 
-		method = options.method || options.type || this.attr2('method');
-		action = options.url || this.attr2('action');
+		const method = options.method || options.type || this.attr2('method');
+		const action = options.url || this.attr2('action');
+
+		let url = typeof action === 'string' ? $.trim(action) : '';
 
-		url = (typeof action === 'string') ? $.trim(action) : '';
 		url = url || window.location.href || '';
 		if (url) {
 			// clean url (don't include hash vaue)
@@ -167,19 +179,19 @@
 		}
 		// IE requires javascript:false in https, but this breaks chrome >83 and goes against spec.
 		// Instead of using javascript:false always, let's only apply it for IE.
-		isMsie = /(MSIE|Trident)/.test(navigator.userAgent || '');
-		iframeSrc = (isMsie && /^https/i.test(window.location.href || '')) ? 'javascript:false' : 'about:blank'; // eslint-disable-line no-script-url
+		const isMsie = /(MSIE|Trident)/.test(navigator.userAgent || '');
+		const iframeSrc = isMsie && /^https/i.test(window.location.href || '') ? 'javascript:false' : 'about:blank'; // eslint-disable-line no-script-url
 
 		options = $.extend(true, {
-			url       : url,
+			iframeSrc : iframeSrc,
 			success   : $.ajaxSettings.success,
 			type      : method || $.ajaxSettings.type,
-			iframeSrc : iframeSrc
+			url       : url
 		}, options);
 
 		// hook for manipulating the form data before it is extracted;
 		// convenient for use with rich editors like tinyMCE or FCKEditor
-		var veto = {};
+		const veto = {};
 
 		this.trigger('form-pre-serialize', [this, options, veto]);
 
@@ -196,51 +208,51 @@
 			return this;
 		}
 
-		var traditional = options.traditional;
+		const {
+			traditional = $.ajaxSettings.traditional
+		} = options;
 
-		if (typeof traditional === 'undefined') {
-			traditional = $.ajaxSettings.traditional;
-		}
+		const elements = [];
+		const arr = this.formToArray(options.semantic, elements, options.filtering);
 
-		var elements = [];
-		var qx, a = this.formToArray(options.semantic, elements, options.filtering);
+		let qx;
 
 		if (options.data) {
-			var optionsData = $.isFunction(options.data) ? options.data(a) : options.data;
+			const optionsData = $.isFunction(options.data) ? options.data(arr) : options.data;
 
 			options.extraData = optionsData;
 			qx = $.param(optionsData, traditional);
 		}
 
 		// give pre-submit callback an opportunity to abort the submit
-		if (options.beforeSubmit && options.beforeSubmit(a, this, options) === false) {
+		if (options.beforeSubmit && options.beforeSubmit(arr, this, options) === false) {
 			log('ajaxSubmit: submit aborted via beforeSubmit callback');
 
 			return this;
 		}
 
 		// fire vetoable 'validate' event
-		this.trigger('form-submit-validate', [a, this, options, veto]);
+		this.trigger('form-submit-validate', [arr, this, options, veto]);
 		if (veto.veto) {
 			log('ajaxSubmit: submit vetoed via form-submit-validate trigger');
 
 			return this;
 		}
 
-		var q = $.param(a, traditional);
+		let queryStr = $.param(arr, traditional);
 
 		if (qx) {
-			q = (q ? (q + '&' + qx) : qx);
+			queryStr = queryStr ? queryStr + '&' + qx : qx;
 		}
 
 		if (options.type.toUpperCase() === 'GET') {
-			options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + q;
+			options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + queryStr;
 			options.data = null;	// data is null for 'get'
 		} else {
-			options.data = q;		// data is the query string for 'post'
+			options.data = queryStr;		// data is the query string for 'post'
 		}
 
-		var callbacks = [];
+		const callbacks = [];
 
 		if (options.resetForm) {
 			callbacks.push(function() {
@@ -256,13 +268,13 @@
 
 		// perform a load on the target only if dataType is not provided
 		if (!options.dataType && options.target) {
-			var oldSuccess = options.success || function(){};
+			const oldSuccess = options.success || function() {};
 
-			callbacks.push(function(data, textStatus, jqXHR) {
-				var successArguments = arguments,
-					fn = options.replaceTarget ? 'replaceWith' : 'html';
+			callbacks.push(function(dta, textStatus, jqXHR) {
+				const fn = options.replaceTarget ? 'replaceWith' : 'html',
+					successArguments = arguments;
 
-				$(options.target)[fn](data).each(function(){
+				$(options.target)[fn](dta).each(function() {
 					oldSuccess.apply(this, successArguments);
 				});
 			});
@@ -275,29 +287,29 @@
 			}
 		}
 
-		options.success = function(data, status, xhr) { // jQuery 1.4+ passes xhr as 3rd arg
-			var context = options.context || this;		// jQuery 1.4+ supports scope context
+		options.success = function(dta, status, xhr) { // jQuery 1.4+ passes xhr as 3rd arg
+			const context = options.context || this;		// jQuery 1.4+ supports scope context
 
-			for (var i = 0, max = callbacks.length; i < max; i++) {
-				callbacks[i].apply(context, [data, status, xhr || $form, $form]);
+			for (const callback of callbacks) {
+				callback.apply(context, [dta, status, xhr || $form, $form]);
 			}
 		};
 
 		if (options.error) {
-			var oldError = options.error;
+			const oldError = options.error;
 
 			options.error = function(xhr, status, error) {
-				var context = options.context || this;
+				const context = options.context || this;
 
 				oldError.apply(context, [xhr, status, error, $form]);
 			};
 		}
 
 		if (options.complete) {
-			var oldComplete = options.complete;
+			const oldComplete = options.complete;
 
 			options.complete = function(xhr, status) {
-				var context = options.context || this;
+				const context = options.context || this;
 
 				oldComplete.apply(context, [xhr, status, $form]);
 			};
@@ -307,18 +319,17 @@
 
 		// [value] (issue #113), also see comment:
 		// https://github.com/malsup/form/commit/588306aedba1de01388032d5f42a60159eea9228#commitcomment-2180219
-		var fileInputs = $('input[type=file]:enabled', this).filter(function() {
+		const fileInputs = $('input[type=file]:enabled', this).filter(function() {
 			return $(this).val() !== '';
 		});
-		var hasFileInputs = fileInputs.length > 0;
-		var mp = 'multipart/form-data';
-		var multipart = ($form.attr('enctype') === mp || $form.attr('encoding') === mp);
-		var fileAPI = feature.fileapi && feature.formdata;
+		const hasFileInputs = fileInputs.length > 0;
+		const multipart = $form.attr('enctype') === MULTIPART || $form.attr('encoding') === MULTIPART;
+		const fileAPI = feature.fileapi && feature.formdata;
 
 		log('fileAPI :' + fileAPI);
 
-		var shouldUseFrame = (hasFileInputs || multipart) && !fileAPI;
-		var jqxhr;
+		const shouldUseFrame = (hasFileInputs || multipart) && !fileAPI;
+		let jqxhr;
 
 		// options.iframe allows user to force iframe mode
 		// 06-NOV-09: now defaulting to iframe mode if file input is detected
@@ -327,15 +338,15 @@
 			// see: http://groups.google.com/group/jquery-dev/browse_thread/thread/36395b7ab510dd5d
 			if (options.closeKeepAlive) {
 				$.get(options.closeKeepAlive, function() {
-					jqxhr = fileUploadIframe(a);
+					jqxhr = fileUploadIframe(arr);
 				});
 
 			} else {
-				jqxhr = fileUploadIframe(a);
+				jqxhr = fileUploadIframe(arr);
 			}
 
 		} else if ((hasFileInputs || multipart) && fileAPI) {
-			jqxhr = fileUploadXhr(a);
+			jqxhr = fileUploadXhr(arr);
 
 		} else {
 			jqxhr = $.ajax(options);
@@ -344,8 +355,8 @@
 		$form.removeData('jqxhr').data('jqxhr', jqxhr);
 
 		// clear element array
-		for (var k = 0; k < elements.length; k++) {
-			elements[k] = null;
+		for (let i = 0; i < elements.length; i++) {
+			elements[i] = null;
 		}
 
 		// fire 'notify' event
@@ -355,15 +366,13 @@
 
 		// utility fn for deep serialization
 		function deepSerialize(extraData) {
-			var serialized = $.param(extraData, options.traditional).split('&');
-			var len = serialized.length;
-			var result = [];
-			var i, part;
+			const serialized = $.param(extraData, options.traditional).split('&');
+			const result = [];
 
-			for (i = 0; i < len; i++) {
+			for (const ser of serialized) {
 				// #252; undo param space replacement
-				serialized[i] = serialized[i].replace(/\+/g, ' ');
-				part = serialized[i].split('=');
+				const part = ser.replace(/\+/g, ' ').split('=');
+
 				// #278; use array instead of object storage, favoring array serializations
 				result.push([decodeURIComponent(part[0]), decodeURIComponent(part[1])]);
 			}
@@ -372,45 +381,47 @@
 		}
 
 		// XMLHttpRequest Level 2 file uploads (big hat tip to francois2metz)
-		function fileUploadXhr(a) {
-			var formdata = new FormData();
+		function fileUploadXhr(array) {
+			const formdata = new FormData();
 
-			for (var i = 0; i < a.length; i++) {
-				formdata.append(a[i].name, a[i].value);
+			for (const {name, value} of array) {
+				formdata.append(name, value);
 			}
 
 			if (options.extraData) {
-				var serializedData = deepSerialize(options.extraData);
+				const serializedData = deepSerialize(options.extraData);
 
-				for (i = 0; i < serializedData.length; i++) {
-					if (serializedData[i]) {
-						formdata.append(serializedData[i][0], serializedData[i][1]);
+				for (const serData of serializedData) {
+					if (serData) {
+						formdata.append(serData[0], serData[1]);
 					}
 				}
 			}
 
 			options.data = null;
 
-			var s = $.extend(true, {}, $.ajaxSettings, options, {
+			const settings = $.extend(true, {}, $.ajaxSettings, options, {
+				cache       : false,
 				contentType : false,
 				processData : false,
-				cache       : false,
 				type        : method || 'POST'
 			});
 
 			if (options.uploadProgress) {
 				// workaround because jqXHR does not expose upload property
-				s.xhr = function() {
-					var xhr = $.ajaxSettings.xhr();
+				settings.xhr = function() {
+					const xhr = $.ajaxSettings.xhr();
 
 					if (xhr.upload) {
 						xhr.upload.addEventListener('progress', function(event) {
-							var percent = 0;
-							var position = event.loaded || event.position;			/* event.position is deprecated */
-							var total = event.total;
+							let percent = 0;
+							const position = event.loaded || event.position;			/* event.position is deprecated */
+							const total = event.total;
 
 							if (event.lengthComputable) {
-								percent = Math.ceil(position / total * 100);
+								const pct = 100;
+
+								percent = Math.ceil(position / total * pct);
 							}
 
 							options.uploadProgress(event, position, total, percent);
@@ -421,40 +432,35 @@
 				};
 			}
 
-			s.data = null;
+			settings.data = null;
 
-			var beforeSend = s.beforeSend;
+			const beforeSend = settings.beforeSend;
 
-			s.beforeSend = function(xhr, o) {
+			settings.beforeSend = function(xhr, optns) {
 				// Send FormData() provided by user
 				if (options.formData) {
-					o.data = options.formData;
+					optns.data = options.formData;
 				} else {
-					o.data = formdata;
+					optns.data = formdata;
 				}
 
 				if (beforeSend) {
-					beforeSend.call(this, xhr, o);
+					beforeSend.call(this, xhr, optns);
 				}
 			};
 
-			return $.ajax(s);
+			return $.ajax(settings);
 		}
 
 		// private function for handling file uploads (hat tip to YAHOO!)
-		function fileUploadIframe(a) {
-			var form = $form[0], el, i, s, g, id, $io, io, xhr, sub, n, timedOut, timeoutHandle;
-			var deferred = $.Deferred();
-
-			// #341
-			deferred.abort = function(status) {
-				xhr.abort(status);
-			};
+		function fileUploadIframe(array) {
+			const form = $form[0];
 
-			if (a) {
+			if (array) {
 				// ensure that every serialized input is still enabled
-				for (i = 0; i < elements.length; i++) {
-					el = $(elements[i]);
+				for (const element of elements) {
+					const el = $(element);
+
 					if (hasProp) {
 						el.prop('disabled', false);
 					} else {
@@ -463,39 +469,36 @@
 				}
 			}
 
-			s = $.extend(true, {}, $.ajaxSettings, options);
-			s.context = s.context || s;
-			id = 'jqFormIO' + new Date().getTime();
-			var ownerDocument = form.ownerDocument;
-			var $body = $form.closest('body');
+			const settings = $.extend(true, {}, $.ajaxSettings, options);
 
-			if (s.iframeTarget) {
-				$io = $(s.iframeTarget, ownerDocument);
-				n = $io.attr2('name');
-				if (!n) {
-					$io.attr2('name', id);
+			settings.context = settings.context || settings;
+			let id = 'jqFormIO' + new Date().getTime();
+			const ownerDocument = form.ownerDocument;
+			const $body = $form.closest('body');
+
+			let $io;
+
+			if (settings.iframeTarget) {
+				$io = $(settings.iframeTarget, ownerDocument);
+				const name = $io.attr2('name');
+
+				if (name) {
+					id = name;
 				} else {
-					id = n;
+					$io.attr2('name', id);
 				}
 
 			} else {
-				$io = $('<iframe name="' + id + '" src="' + s.iframeSrc + '" />', ownerDocument);
-				$io.css({position: 'absolute', top: '-1000px', left: '-1000px'});
+				$io = $('<iframe name="' + id + '" src="' + settings.iframeSrc + '" />', ownerDocument);
+				$io.css({left: '-1000px', position: 'absolute', top: '-1000px'});
 			}
-			io = $io[0];
+			const io = $io[0];
 
+			const glbl = settings.global;
 
-			xhr = { // mock object
-				aborted               : 0,
-				responseText          : null,
-				responseXML           : null,
-				status                : 0,
-				statusText            : 'n/a',
-				getAllResponseHeaders : function() {},
-				getResponseHeader     : function() {},
-				setRequestHeader      : function() {},
-				abort                 : function(status) {
-					var e = (status === 'timeout' ? 'timeout' : 'aborted');
+			const xhr = { // mock object
+				abort : function(status) {
+					const e = status === 'timeout' ? 'timeout' : 'aborted';
 
 					log('aborting upload... ' + e);
 					this.aborted = 1;
@@ -506,33 +509,47 @@
 						}
 					} catch (ignore) {}
 
-					$io.attr('src', s.iframeSrc); // abort op in progress
+					$io.attr('src', settings.iframeSrc); // abort op in progress
 					xhr.error = e;
-					if (s.error) {
-						s.error.call(s.context, xhr, e, status);
+					if (settings.error) {
+						settings.error.call(settings.context, xhr, e, status);
 					}
 
-					if (g) {
-						$.event.trigger('ajaxError', [xhr, s, e]);
+					if (glbl) {
+						$.event.trigger('ajaxError', [xhr, settings, e]);
 					}
 
-					if (s.complete) {
-						s.complete.call(s.context, xhr, e);
+					if (settings.complete) {
+						settings.complete.call(settings.context, xhr, e);
 					}
-				}
+				},
+				aborted               : 0,
+				getAllResponseHeaders : function() {},
+				getResponseHeader     : function() {},
+				responseText          : null,
+				responseXML           : null,
+				setRequestHeader      : function() {},
+				status                : 0,
+				statusText            : 'n/a'
 			};
 
-			g = s.global;
 			// trigger ajax global events so that activity/block indicators work like normal
-			if (g && $.active++ === 0) {
+			if (glbl && $.active++ === 0) {
 				$.event.trigger('ajaxStart');
 			}
-			if (g) {
-				$.event.trigger('ajaxSend', [xhr, s]);
+			if (glbl) {
+				$.event.trigger('ajaxSend', [xhr, settings]);
 			}
 
-			if (s.beforeSend && s.beforeSend.call(s.context, xhr, s) === false) {
-				if (s.global) {
+			const deferred = $.Deferred();
+
+			// #341
+			deferred.abort = function(status) {
+				xhr.abort(status);
+			};
+
+			if (settings.beforeSend && settings.beforeSend.call(settings.context, xhr, settings) === false) {
+				if (settings.global) {
 					$.active--;
 				}
 				deferred.reject();
@@ -547,21 +564,23 @@
 			}
 
 			// add submitting element to data if we know it
-			sub = form.clk;
+			const sub = form.clk;
+
 			if (sub) {
-				n = sub.name;
-				if (n && !sub.disabled) {
-					s.extraData = s.extraData || {};
-					s.extraData[n] = sub.value;
+				const {name} = sub;
+
+				if (name && !sub.disabled) {
+					settings.extraData = settings.extraData || {};
+					settings.extraData[name] = sub.value;
 					if (sub.type === 'image') {
-						s.extraData[n + '.x'] = form.clk_x;
-						s.extraData[n + '.y'] = form.clk_y;
+						settings.extraData[name + '.x'] = form.clk_x;
+						settings.extraData[name + '.y'] = form.clk_y;
 					}
 				}
 			}
 
-			var CLIENT_TIMEOUT_ABORT = 1;
-			var SERVER_ABORT = 2;
+			const CLIENT_TIMEOUT_ABORT = 1;
+			const SERVER_ABORT = 2;
 
 			function getDoc(frame) {
 				/* it looks like contentWindow or contentDocument do not
@@ -571,7 +590,7 @@
 				 * "Same origin policy" http://en.wikipedia.org/wiki/Same_origin_policy
 				 */
 
-				var doc = null;
+				let doc = null;
 
 				// IE8 cascading access check
 				try {
@@ -599,33 +618,34 @@
 			}
 
 			// Rails CSRF hack (thanks to Yvan Barthelemy)
-			var csrf_token = $('meta[name=csrf-token]').attr('content');
-			var csrf_param = $('meta[name=csrf-param]').attr('content');
+			const csrfToken = $('meta[name=csrf-token]').attr('content');
+			const csrfParam = $('meta[name=csrf-param]').attr('content');
 
-			if (csrf_param && csrf_token) {
-				s.extraData = s.extraData || {};
-				s.extraData[csrf_param] = csrf_token;
+			if (csrfParam && csrfToken) {
+				settings.extraData = settings.extraData || {};
+				settings.extraData[csrfParam] = csrfToken;
 			}
 
+			let timedOut, timeoutHandle;
+
 			// take a breath so that pending repaints get some cpu time before the upload starts
 			function doSubmit() {
 				// make sure form attrs are set
-				var t = $form.attr2('target'),
-					a = $form.attr2('action'),
-					mp = 'multipart/form-data',
-					et = $form.attr('enctype') || $form.attr('encoding') || mp;
+				const actn = $form.attr2('action'),
+					et = $form.attr('enctype') || $form.attr('encoding') || MULTIPART,
+					target = $form.attr2('target');
 
 				// update form attrs in IE friendly way
 				form.setAttribute('target', id);
 				if (!method || /post/i.test(method)) {
 					form.setAttribute('method', 'POST');
 				}
-				if (a !== s.url) {
-					form.setAttribute('action', s.url);
+				if (actn !== settings.url) {
+					form.setAttribute('action', settings.url);
 				}
 
 				// ie borks in some cases when setting encoding
-				if (!s.skipEncodingOverride && (!method || /post/i.test(method))) {
+				if (!settings.skipEncodingOverride && (!method || /post/i.test(method))) {
 					$form.attr({
 						encoding : 'multipart/form-data',
 						enctype  : 'multipart/form-data'
@@ -633,20 +653,22 @@
 				}
 
 				// support timout
-				if (s.timeout) {
+				if (settings.timeout) {
 					timeoutHandle = setTimeout(function() {
 						timedOut = true; cb(CLIENT_TIMEOUT_ABORT);
-					}, s.timeout);
+					}, settings.timeout);
 				}
 
 				// look for server aborts
 				function checkState() {
 					try {
-						var state = getDoc(io).readyState;
+						const state = getDoc(io).readyState;
 
 						log('state = ' + state);
 						if (state && state.toLowerCase() === 'uninitialized') {
-							setTimeout(checkState, 50);
+							const timeout = 50;
+
+							setTimeout(checkState, timeout);
 						}
 
 					} catch (e) {
@@ -660,27 +682,25 @@
 				}
 
 				// add "extra" data to form if provided in options
-				var extraInputs = [];
+				const extraInputs = [];
 
 				try {
-					if (s.extraData) {
-						for (var n in s.extraData) {
-							if (s.extraData.hasOwnProperty(n)) {
-								// if using the $.param format that allows for multiple values with the same name
-								if ($.isPlainObject(s.extraData[n]) && s.extraData[n].hasOwnProperty('name') && s.extraData[n].hasOwnProperty('value')) {
-									extraInputs.push(
-										$('<input type="hidden" name="' + s.extraData[n].name + '">', ownerDocument).val(s.extraData[n].value)
-											.appendTo(form)[0]);
-								} else {
-									extraInputs.push(
-										$('<input type="hidden" name="' + n + '">', ownerDocument).val(s.extraData[n])
-											.appendTo(form)[0]);
-								}
+					if (settings.extraData) {
+						for (const nExtraData of Object.values(settings.extraData)) {
+							// if using the $.param format that allows for multiple values with the same name
+							if ($.isPlainObject(nExtraData) && hasOwn(nExtraData, 'name') && hasOwn(nExtraData, 'value')) {
+								extraInputs.push(
+									$('<input type="hidden" name="' + nExtraData.name + '">', ownerDocument).val(nExtraData.value)
+										.appendTo(form)[0]);
+							} else {
+								extraInputs.push(
+									$('<input type="hidden" name="' + name + '">', ownerDocument).val(nExtraData)
+										.appendTo(form)[0]);
 							}
 						}
 					}
 
-					if (!s.iframeTarget) {
+					if (!settings.iframeTarget) {
 						// add iframe to doc and submit the form
 						$io.appendTo($body);
 					}
@@ -691,24 +711,26 @@
 						io.addEventListener('load', cb, false);
 					}
 
-					setTimeout(checkState, 15);
+					const timeout = 15;
+
+					setTimeout(checkState, timeout);
 
 					try {
 						form.submit();
 
 					} catch (err) {
 						// just in case form has element with name/id of 'submit'
-						var submitFn = document.createElement('form').submit;
+						const submitFn = document.createElement('form').submit;
 
 						submitFn.apply(form);
 					}
 
 				} finally {
 					// reset attrs and remove "extra" input elements
-					form.setAttribute('action', a);
+					form.setAttribute('action', actn);
 					form.setAttribute('enctype', et); // #380
-					if (t) {
-						form.setAttribute('target', t);
+					if (target) {
+						form.setAttribute('target', target);
 					} else {
 						$form.removeAttr('target');
 					}
@@ -716,20 +738,39 @@
 				}
 			}
 
-			if (s.forceSync) {
+			// eslint-disable-next-line no-sync
+			if (settings.forceSync) {
 				doSubmit();
 			} else {
-				setTimeout(doSubmit, 10); // this lets dom updates render
+				const timeout = 10;
+
+				setTimeout(doSubmit, timeout); // this lets dom updates render
 			}
 
-			var data, doc, domCheckCount = 50, callbackProcessed;
+			const toXml = $.parseXML || function(str, docum) { // use parseXML if available (jQuery 1.5+)
+				if (window.ActiveXObject) {
+					docum = new ActiveXObject('Microsoft.XMLDOM');
+					docum.async = 'false';
+					docum.loadXML(str);
+
+				} else {
+					docum = new DOMParser().parseFromString(str, 'text/xml');
+				}
+
+				return docum && docum.documentElement && docum.documentElement.nodeName !== 'parsererror' ? docum : null;
+			};
+
+			// eslint-disable-next-line prefer-const
+			let httpData;
+			let callbackProcessed, domCheckCount = 50;
 
 			function cb(e) {
 				if (xhr.aborted || callbackProcessed) {
 					return;
 				}
 
-				doc = getDoc(io);
+				const doc = getDoc(io);
+
 				if (!doc) {
 					log('cannot access response document');
 					e = SERVER_ABORT;
@@ -748,7 +789,7 @@
 					return;
 				}
 
-				if (!doc || doc.location.href === s.iframeSrc) {
+				if (!doc || doc.location.href === settings.iframeSrc) {
 					// response not received yet
 					if (!timedOut) {
 						return;
@@ -761,14 +802,14 @@
 					io.removeEventListener('load', cb, false);
 				}
 
-				var status = 'success', errMsg;
+				let dta, errMsg, status = 'success';
 
 				try {
 					if (timedOut) {
-						throw 'timeout';
+						throw new Error('timeout');
 					}
 
-					var isXml = s.dataType === 'xml' || doc.XMLDocument || $.isXMLDoc(doc);
+					const isXml = settings.dataType === 'xml' || doc.XMLDocument || $.isXMLDoc(doc);
 
 					log('isXml=' + isXml);
 
@@ -777,7 +818,10 @@
 							// in some browsers (Opera) the iframe DOM is not always traversable when
 							// the onload callback fires, so we loop a bit to accommodate
 							log('requeing onLoad callback, DOM not available');
-							setTimeout(cb, 250);
+
+							const timeout = 250;
+
+							setTimeout(cb, timeout);
 
 							return;
 						}
@@ -787,15 +831,15 @@
 					}
 
 					// log('response detected');
-					var docRoot = doc.body ? doc.body : doc.documentElement;
+					const docRoot = doc.body ? doc.body : doc.documentElement;
 
 					xhr.responseText = docRoot ? docRoot.innerHTML : null;
 					xhr.responseXML = doc.XMLDocument ? doc.XMLDocument : doc;
 					if (isXml) {
-						s.dataType = 'xml';
+						settings.dataType = 'xml';
 					}
-					xhr.getResponseHeader = function(header){
-						var headers = {'content-type': s.dataType};
+					xhr.getResponseHeader = function(header) {
+						const headers = {'content-type': settings.dataType};
 
 						return headers[header.toLowerCase()];
 					};
@@ -805,12 +849,12 @@
 						xhr.statusText = docRoot.getAttribute('statusText') || xhr.statusText;
 					}
 
-					var dt = (s.dataType || '').toLowerCase();
-					var scr = /(json|script|text)/.test(dt);
+					const dt = (settings.dataType || '').toLowerCase();
+					const scr = /(json|script|text)/.test(dt);
 
-					if (scr || s.textarea) {
+					if (scr || settings.textarea) {
 						// see if user embedded response in textarea
-						var ta = doc.getElementsByTagName('textarea')[0];
+						const ta = doc.getElementsByTagName('textarea')[0];
 
 						if (ta) {
 							xhr.responseText = ta.value;
@@ -820,32 +864,33 @@
 
 						} else if (scr) {
 							// account for browsers injecting pre around json response
-							var pre = doc.getElementsByTagName('pre')[0];
-							var b = doc.getElementsByTagName('body')[0];
+							const pre = doc.getElementsByTagName('pre')[0];
+							const body = doc.getElementsByTagName('body')[0];
 
 							if (pre) {
 								xhr.responseText = pre.textContent ? pre.textContent : pre.innerText;
-							} else if (b) {
-								xhr.responseText = b.textContent ? b.textContent : b.innerText;
+							} else if (body) {
+								xhr.responseText = body.textContent ? body.textContent : body.innerText;
 							}
 						}
 
 					} else if (dt === 'xml' && !xhr.responseXML && xhr.responseText) {
-						xhr.responseXML = toXml(xhr.responseText);			// eslint-disable-line no-use-before-define
+						xhr.responseXML = toXml(xhr.responseText);
 					}
 
 					try {
-						data = httpData(xhr, dt, s);						// eslint-disable-line no-use-before-define
-
+						dta = httpData(xhr, dt, settings);
 					} catch (err) {
 						status = 'parsererror';
-						xhr.error = errMsg = (err || status);
+						errMsg = err || status;
+						xhr.error = errMsg;
 					}
 
 				} catch (err) {
 					log('error caught: ', err);
 					status = 'error';
-					xhr.error = errMsg = (err || status);
+					errMsg = err || status;
+					xhr.error = errMsg;
 				}
 
 				if (xhr.aborted) {
@@ -854,107 +899,97 @@
 				}
 
 				if (xhr.status) { // we've set xhr.status
-					status = ((xhr.status >= 200 && xhr.status < 300) || xhr.status === 304) ? 'success' : 'error';
+					status = (xhr.status >= SUCCESS && xhr.status < REDIRECT) || xhr.status === NOT_MODIFIED ? 'success' : 'error';
 				}
 
 				// ordering of these callbacks/triggers is odd, but that's how $.ajax does it
 				if (status === 'success') {
-					if (s.success) {
-						s.success.call(s.context, data, 'success', xhr);
+					if (settings.success) {
+						settings.success.call(settings.context, dta, 'success', xhr);
 					}
 
 					deferred.resolve(xhr.responseText, 'success', xhr);
 
-					if (g) {
-						$.event.trigger('ajaxSuccess', [xhr, s]);
+					if (glbl) {
+						$.event.trigger('ajaxSuccess', [xhr, settings]);
 					}
 
 				} else if (status) {
 					if (typeof errMsg === 'undefined') {
 						errMsg = xhr.statusText;
 					}
-					if (s.error) {
-						s.error.call(s.context, xhr, status, errMsg);
+					if (settings.error) {
+						settings.error.call(settings.context, xhr, status, errMsg);
 					}
 					deferred.reject(xhr, 'error', errMsg);
-					if (g) {
-						$.event.trigger('ajaxError', [xhr, s, errMsg]);
+					if (glbl) {
+						$.event.trigger('ajaxError', [xhr, settings, errMsg]);
 					}
 				}
 
-				if (g) {
-					$.event.trigger('ajaxComplete', [xhr, s]);
+				if (glbl) {
+					$.event.trigger('ajaxComplete', [xhr, settings]);
 				}
 
-				if (g && !--$.active) {
+				if (glbl && !--$.active) {
 					$.event.trigger('ajaxStop');
 				}
 
-				if (s.complete) {
-					s.complete.call(s.context, xhr, status);
+				if (settings.complete) {
+					settings.complete.call(settings.context, xhr, status);
 				}
 
 				callbackProcessed = true;
-				if (s.timeout) {
+				if (settings.timeout) {
 					clearTimeout(timeoutHandle);
 				}
 
 				// clean up
+				const timeout = 100;
+
 				setTimeout(function() {
-					if (!s.iframeTarget) {
-						$io.remove();
+					if (settings.iframeTarget) {
+						$io.attr('src', settings.iframeSrc);
 					} else { // adding else to clean up existing iframe response.
-						$io.attr('src', s.iframeSrc);
+						$io.remove();
 					}
 					xhr.responseXML = null;
-				}, 100);
+				}, timeout);
 			}
 
-			var toXml = $.parseXML || function(s, doc) { // use parseXML if available (jQuery 1.5+)
-				if (window.ActiveXObject) {
-					doc = new ActiveXObject('Microsoft.XMLDOM');
-					doc.async = 'false';
-					doc.loadXML(s);
-
-				} else {
-					doc = (new DOMParser()).parseFromString(s, 'text/xml');
-				}
-
-				return (doc && doc.documentElement && doc.documentElement.nodeName !== 'parsererror') ? doc : null;
-			};
-			var parseJSON = $.parseJSON || function(s) {
-				/* jslint evil:true */
-				return window['eval']('(' + s + ')');			// eslint-disable-line dot-notation
+			const parseJSON = $.parseJSON || function(str) {
+				return window['eval']('(' + str + ')');			// eslint-disable-line dot-notation
 			};
 
-			var httpData = function(xhr, type, s) { // mostly lifted from jq1.4.4
+			httpData = function(xhr$, type, settngs) { // mostly lifted from jq1.4.4
 
-				var ct = xhr.getResponseHeader('content-type') || '',
-					xml = ((type === 'xml' || !type) && ct.indexOf('xml') >= 0),
-					data = xml ? xhr.responseXML : xhr.responseText;
+				const ct = xhr$.getResponseHeader('content-type') || '',
+					xml = (type === 'xml' || !type) && ct.indexOf('xml') >= 0;
+				let dta = xml ? xhr$.responseXML : xhr$.responseText;
 
-				if (xml && data.documentElement.nodeName === 'parsererror') {
+				if (xml && dta.documentElement.nodeName === 'parsererror') {
 					if ($.error) {
 						$.error('parsererror');
 					}
 				}
-				if (s && s.dataFilter) {
-					data = s.dataFilter(data, type);
+				if (settngs && settngs.dataFilter) {
+					dta = settngs.dataFilter(dta, type);
 				}
-				if (typeof data === 'string') {
+				if (typeof dta === 'string') {
 					if ((type === 'json' || !type) && ct.indexOf('json') >= 0) {
-						data = parseJSON(data);
+						dta = parseJSON(dta);
 					} else if ((type === 'script' || !type) && ct.indexOf('javascript') >= 0) {
-						$.globalEval(data);
+						$.globalEval(dta);
 					}
 				}
 
-				return data;
+				return dta;
 			};
 
 			return deferred;
 		}
 	};
+	/* eslint-enable complexity, max-statements */
 
 	/**
 	 * ajaxForm() provides a mechanism for fully automating form submission.
@@ -974,9 +1009,9 @@
 	$.fn.ajaxForm = function(options, data, dataType, onSuccess) {
 		if (typeof options === 'string' || (options === false && arguments.length > 0)) {
 			options = {
-				'url'      : options,
-				'data'     : data,
-				'dataType' : dataType
+				data     : data,
+				dataType : dataType,
+				url      : options
 			};
 
 			if (typeof onSuccess === 'function') {
@@ -989,12 +1024,12 @@
 
 		// in jQuery 1.3+ we can fix mistakes with the ready state
 		if (!options.delegation && this.length === 0) {
-			var o = {s: this.selector, c: this.context};
+			const ctxt = this.context, sel = this.selector;
 
-			if (!$.isReady && o.s) {
+			if (!$.isReady && sel) {
 				log('DOM not ready, queuing ajaxForm');
 				$(function() {
-					$(o.s, o.c).ajaxForm(options);
+					$(sel, ctxt).ajaxForm(options);
 				});
 
 				return this;
@@ -1027,8 +1062,7 @@
 
 	// private event handlers
 	function doAjaxSubmit(e) {
-		/* jshint validthis:true */
-		var options = e.data;
+		const options = e.data;
 
 		if (!e.isDefaultPrevented()) { // if event has been canceled, don't proceed
 			e.preventDefault();
@@ -1037,21 +1071,20 @@
 	}
 
 	function captureSubmittingElement(e) {
-		/* jshint validthis:true */
-		var target = e.target;
-		var $el = $(target);
+		let {target} = e;
+		const $el = $(target);
 
 		if (!$el.is('[type=submit],[type=image]')) {
 			// is this a child element of the submit el?  (ex: a span within a button)
-			var t = $el.closest('[type=submit]');
+			const submit = $el.closest('[type=submit]');
 
-			if (t.length === 0) {
+			if (submit.length === 0) {
 				return;
 			}
-			target = t[0];
+			target = submit[0];
 		}
 
-		var form = target.form;
+		const form = target.form;
 
 		form.clk = target;
 
@@ -1061,7 +1094,7 @@
 				form.clk_y = e.offsetY;
 
 			} else if (typeof $.fn.offset === 'function') {
-				var offset = $el.offset();
+				const offset = $el.offset();
 
 				form.clk_x = e.pageX - offset.left;
 				form.clk_y = e.pageY - offset.top;
@@ -1072,9 +1105,13 @@
 			}
 		}
 		// clear form vars
+		const timeout = 100;
+
 		setTimeout(function() {
-			form.clk = form.clk_x = form.clk_y = null;
-		}, 100);
+			form.clk = null;
+			form.clk_x = null;
+			form.clk_y = null;
+		}, timeout);
 	}
 
 
@@ -1083,6 +1120,7 @@
 		return this.off('submit.form-plugin click.form-plugin');
 	};
 
+	/* eslint-disable complexity, max-statements */
 	/**
 	 * formToArray() gathers form element data into an array of objects that can
 	 * be passed to any of the following ajax functions: $.get, $.post, or load.
@@ -1095,16 +1133,15 @@
 	 * ajaxSubmit() and ajaxForm() methods.
 	 */
 	$.fn.formToArray = function(semantic, elements, filtering) {
-		var a = [];
+		const arr = [];
 
 		if (this.length === 0) {
-			return a;
+			return arr;
 		}
 
-		var form = this[0];
-		var formId = this.attr('id');
-		var els = (semantic || typeof form.elements === 'undefined') ? form.getElementsByTagName('*') : form.elements;
-		var els2;
+		const form = this[0];
+		const formId = this.attr('id');
+		let els = semantic || typeof form.elements === 'undefined' ? form.getElementsByTagName('*') : form.elements;
 
 		if (els) {
 			els = $.makeArray(els); // convert to standard array
@@ -1113,45 +1150,47 @@
 		// #386; account for inputs outside the form which use the 'form' attribute
 		// FinesseRus: in non-IE browsers outside fields are already included in form.elements.
 		if (formId && (semantic || /(Edge|Trident)\//.test(navigator.userAgent))) {
-			els2 = $(':input[form="' + formId + '"]').get(); // hat tip @thet
+			const els2 = $(':input[form="' + formId + '"]').get(); // hat tip @thet
+
 			if (els2.length) {
 				els = (els || []).concat(els2);
 			}
 		}
 
 		if (!els || !els.length) {
-			return a;
+			return arr;
 		}
 
 		if ($.isFunction(filtering)) {
 			els = $.map(els, filtering);
 		}
 
-		var i, j, n, v, el, max, jmax;
+		for (const el of els) {
+			const {name} = el;
 
-		for (i = 0, max = els.length; i < max; i++) {
-			el = els[i];
-			n = el.name;
-			if (!n || el.disabled) {
+			if (!name || el.disabled) {
+				// eslint-disable-next-line no-continue
 				continue;
 			}
 
 			if (semantic && form.clk && el.type === 'image') {
 				// handle image inputs on the fly when semantic == true
 				if (form.clk === el) {
-					a.push({name: n, value: $(el).val(), type: el.type});
-					a.push({name: n + '.x', value: form.clk_x}, {name: n + '.y', value: form.clk_y});
+					arr.push({name: name, type: el.type, value: $(el).val()});
+					arr.push({name: name + '.x', value: form.clk_x}, {name: name + '.y', value: form.clk_y});
 				}
+				// eslint-disable-next-line no-continue
 				continue;
 			}
 
-			v = $.fieldValue(el, true);
-			if (v && v.constructor === Array) {
+			const val = $.fieldValue(el, true);
+
+			if (val && Array.isArray(val)) {
 				if (elements) {
 					elements.push(el);
 				}
-				for (j = 0, jmax = v.length; j < jmax; j++) {
-					a.push({name: n, value: v[j]});
+				for (const value of val) {
+					arr.push({name: name, value: value});
 				}
 
 			} else if (feature.fileapi && el.type === 'file') {
@@ -1159,39 +1198,40 @@
 					elements.push(el);
 				}
 
-				var files = el.files;
+				const files = el.files;
 
 				if (files.length) {
-					for (j = 0; j < files.length; j++) {
-						a.push({name: n, value: files[j], type: el.type});
+					for (const file of files) {
+						arr.push({name: name, type: el.type, value: file});
 					}
 				} else {
 					// #180
-					a.push({name: n, value: '', type: el.type});
+					arr.push({name: name, type: el.type, value: ''});
 				}
 
-			} else if (v !== null && typeof v !== 'undefined') {
+			} else if (val !== null && typeof val !== 'undefined') {
 				if (elements) {
 					elements.push(el);
 				}
-				a.push({name: n, value: v, type: el.type, required: el.required});
+				arr.push({name: name, required: el.required, type: el.type, value: val});
 			}
 		}
 
 		if (!semantic && form.clk) {
 			// input type=='image' are not found in elements array! handle it here
-			var $input = $(form.clk), input = $input[0];
+			const $input = $(form.clk), input = $input[0];
 
-			n = input.name;
+			const {name} = input;
 
-			if (n && !input.disabled && input.type === 'image') {
-				a.push({name: n, value: $input.val()});
-				a.push({name: n + '.x', value: form.clk_x}, {name: n + '.y', value: form.clk_y});
+			if (name && !input.disabled && input.type === 'image') {
+				arr.push({name: name, value: $input.val()});
+				arr.push({name: name + '.x', value: form.clk_x}, {name: name + '.y', value: form.clk_y});
 			}
 		}
 
-		return a;
+		return arr;
 	};
+	/* eslint-enable complexity, max-statements */
 
 	/**
 	 * Serializes form data into a 'submittable' string. This method will return a string
@@ -1207,29 +1247,29 @@
 	 * This method will return a string in the format: name1=value1&amp;name2=value2
 	 */
 	$.fn.fieldSerialize = function(successful) {
-		var a = [];
+		const arr = [];
 
 		this.each(function() {
-			var n = this.name;
+			const {name} = this;
 
-			if (!n) {
+			if (!name) {
 				return;
 			}
 
-			var v = $.fieldValue(this, successful);
+			const val = $.fieldValue(this, successful);
 
-			if (v && v.constructor === Array) {
-				for (var i = 0, max = v.length; i < max; i++) {
-					a.push({name: n, value: v[i]});
+			if (val && Array.isArray(val)) {
+				for (const value of val) {
+					arr.push({name: name, value: value});
 				}
 
-			} else if (v !== null && typeof v !== 'undefined') {
-				a.push({name: this.name, value: v});
+			} else if (val !== null && typeof val !== 'undefined') {
+				arr.push({name: name, value: val});
 			}
 		});
 
 		// hand off to jQuery.param for proper encoding
-		return $.param(a);
+		return $.param(arr);
 	};
 
 	/**
@@ -1271,77 +1311,80 @@
 	 *	array will be empty, otherwise it will contain one or more values.
 	 */
 	$.fn.fieldValue = function(successful) {
-		for (var val = [], i = 0, max = this.length; i < max; i++) {
-			var el = this[i];
-			var v = $.fieldValue(el, successful);
+		const val = [];
 
-			if (v === null || typeof v === 'undefined' || (v.constructor === Array && !v.length)) {
+		for (let i = 0, max = this.length; i < max; i++) {
+			const el = this[i];
+			const value = $.fieldValue(el, successful);
+
+			if (value === null || typeof value === 'undefined' || (Array.isArray(value) && !value.length)) {
+				// eslint-disable-next-line no-continue
 				continue;
 			}
 
-			if (v.constructor === Array) {
-				$.merge(val, v);
+			if (Array.isArray(value)) {
+				$.merge(val, value);
 			} else {
-				val.push(v);
+				val.push(value);
 			}
 		}
 
 		return val;
 	};
 
+	/* eslint-disable complexity, max-statements */
 	/**
 	 * Returns the value of the field element.
 	 */
 	$.fieldValue = function(el, successful) {
-		var n = el.name, t = el.type, tag = el.tagName.toLowerCase();
+		const {name} = el, {type} = el, tag = el.tagName.toLowerCase();
 
 		if (typeof successful === 'undefined') {
 			successful = true;
 		}
 
-		/* eslint-disable no-mixed-operators */
-		if (successful && (!n || el.disabled || t === 'reset' || t === 'button' ||
-			(t === 'checkbox' || t === 'radio') && !el.checked ||
-			(t === 'submit' || t === 'image') && el.form && el.form.clk !== el ||
-			tag === 'select' && el.selectedIndex === -1)) {
-		/* eslint-enable no-mixed-operators */
+		if (successful && (
+			!name || el.disabled || type === 'reset' || type === 'button' ||
+			((type === 'checkbox' || type === 'radio') && !el.checked) ||
+			((type === 'submit' || type === 'image') && el.form && el.form.clk !== el) ||
+			(tag === 'select' && el.selectedIndex < 0)
+		)) {
 			return null;
 		}
 
 		if (tag === 'select') {
-			var index = el.selectedIndex;
+			const index = el.selectedIndex;
 
 			if (index < 0) {
 				return null;
 			}
 
-			var a = [], ops = el.options;
-			var one = (t === 'select-one');
-			var max = (one ? index + 1 : ops.length);
+			const arr = [], ops = el.options;
+			const one = type === 'select-one';
+			const max = one ? index + 1 : ops.length;
 
-			for (var i = (one ? index : 0); i < max; i++) {
-				var op = ops[i];
+			for (let i = one ? index : 0; i < max; i++) {
+				const op = ops[i];
 
 				if (op.selected && !op.disabled) {
-					var v = op.value;
-
-					if (!v) { // extra pain for IE...
-						v = (op.attributes && op.attributes.value && !(op.attributes.value.specified)) ? op.text : op.value;
-					}
+					const val = op.value ||
+						// extra pain for IE...
+						(op.attributes && op.attributes.value && !op.attributes.value.specified ? op.text : op.value);
 
 					if (one) {
-						return v;
+						return val;
 					}
 
-					a.push(v);
+					arr.push(val);
 				}
 			}
 
-			return a;
+			return arr;
 		}
 
 		return $(el).val().replace(rCRLF, '\r\n');
 	};
+	/* eslint-enable complexity, max-statements */
 
 	/**
 	 * Clears the form data. Takes the following actions on the form's input fields:
@@ -1357,25 +1400,27 @@
 		});
 	};
 
+	/* eslint-disable no-multi-assign */
 	/**
 	 * Clears the selected form elements.
 	 */
 	$.fn.clearFields = $.fn.clearInputs = function(includeHidden) {
-		var re = /^(?:color|date|datetime|email|month|number|password|range|search|tel|text|time|url|week)$/i; // 'hidden' is not in this list
+		/* eslint-enable no-multi-assign */
+		const re = /^(?:color|date|datetime|email|month|number|password|range|search|tel|text|time|url|week)$/i; // 'hidden' is not in this list
 
 		return this.each(function() {
-			var t = this.type, tag = this.tagName.toLowerCase();
+			const {type} = this, tag = this.tagName.toLowerCase();
 
-			if (re.test(t) || tag === 'textarea') {
+			if (re.test(type) || tag === 'textarea') {
 				this.value = '';
 
-			} else if (t === 'checkbox' || t === 'radio') {
+			} else if (type === 'checkbox' || type === 'radio') {
 				this.checked = false;
 
 			} else if (tag === 'select') {
 				this.selectedIndex = -1;
 
-			} else if (t === 'file') {
+			} else if (type === 'file') {
 				if (/MSIE/.test(navigator.userAgent)) {
 					$(this).replaceWith($(this).clone(true));
 				} else {
@@ -1387,7 +1432,7 @@
 				// indicating a special test; for example:
 				// $('#myForm').clearForm('.special:hidden')
 				// the above would clean hidden inputs that have the class of 'special'
-				if ((includeHidden === true && /hidden/.test(t)) ||
+				if ((includeHidden === true && /hidden/.test(type)) ||
 					(typeof includeHidden === 'string' && $(this).is(includeHidden))) {
 					this.value = '';
 				}
@@ -1408,8 +1453,8 @@
 	 */
 	$.fn.resetForm = function() {
 		return this.each(function() {
-			var el = $(this);
-			var tag = this.tagName.toLowerCase();
+			const el = $(this);
+			const tag = this.tagName.toLowerCase();
 
 			switch (tag) {
 			case 'input':
@@ -1422,8 +1467,8 @@
 				return true;
 
 			case 'option':
-			case 'optgroup':
-				var select = el.parents('select');
+			case 'optgroup': {
+				const select = el.parents('select');
 
 				if (select.length && select[0].multiple) {
 					if (tag === 'option') {
@@ -1436,7 +1481,7 @@
 				}
 
 				return true;
-
+			}
 			case 'select':
 				el.find('option').each(function(i) {				// eslint-disable-line consistent-return
 					this.selected = this.defaultSelected;
@@ -1449,9 +1494,9 @@
 
 				return true;
 
-			case 'label':
-				var forEl = $(el.attr('for'));
-				var list = el.find('input,select,textarea');
+			case 'label': {
+				const forEl = $(el.attr('for'));
+				const list = el.find('input,select,textarea');
 
 				if (forEl[0]) {
 					list.unshift(forEl[0]);
@@ -1460,7 +1505,7 @@
 				list.resetForm();
 
 				return true;
-
+			}
 			case 'form':
 				// guard against an input with the name of 'reset'
 				// note that IE reports the reset function as an 'object'
@@ -1481,13 +1526,13 @@
 	/**
 	 * Enables or disables any matching elements.
 	 */
-	$.fn.enable = function(b) {
-		if (typeof b === 'undefined') {
-			b = true;
+	$.fn.enable = function(elem) {
+		if (typeof elem === 'undefined') {
+			elem = true;
 		}
 
 		return this.each(function() {
-			this.disabled = !b;
+			this.disabled = !elem;
 		});
 	};
 
@@ -1501,13 +1546,13 @@
 		}
 
 		return this.each(function() {
-			var t = this.type;
+			const {type} = this;
 
-			if (t === 'checkbox' || t === 'radio') {
+			if (type === 'checkbox' || type === 'radio') {
 				this.checked = select;
 
 			} else if (this.tagName.toLowerCase() === 'option') {
-				var $sel = $(this).parent('select');
+				const $sel = $(this).parent('select');
 
 				if (select && $sel[0] && $sel[0].type === 'select-one') {
 					// deselect all other options
@@ -1528,7 +1573,7 @@
 			return;
 		}
 
-		var msg = '[jquery.form] ' + Array.prototype.join.call(arguments, '');
+		const msg = '[jquery.form] ' + Array.prototype.join.call(arguments, '');
 
 		if (window.console && window.console.log) {
 			window.console.log(msg);
diff --git a/test/.eslintrc.js b/test/.eslintrc.js
index edd586ad..842fc606 100644
--- a/test/.eslintrc.js
+++ b/test/.eslintrc.js
@@ -1,32 +1,34 @@
+'use strict';
+
 module.exports = {
-	"env": {
-		"browser": true,
-		"jquery": true,
-		"node": true,
-		"mocha": true
+	env : {
+		browser : true,
+		jquery  : true,
+		mocha   : true,
+		node    : true
 	},
-	"parserOptions": {
-		"ecmaVersion": 5,
-		"sourceType": "script"
+	parserOptions : {
+		ecmaVersion : 2015,
+		sourceType  : 'script'
 	},
-	"rules": {
-		"comma-spacing": "warn",
-		"eqeqeq": "warn",
-		"newline-after-var": "off",
-		"newline-before-return": "off",
-		"no-multi-spaces": "warn",
-		"object-curly-spacing": [
-			"warn",
-			"never",
+	rules : {
+		'comma-spacing'         : 'warn',
+		'eqeqeq'                : 'warn',
+		'newline-after-var'     : 'off',
+		'newline-before-return' : 'off',
+		'no-multi-spaces'       : 'warn',
+		'object-curly-spacing'  : [
+			'warn',
+			'never',
 			{
-				"arraysInObjects": true,
-				"objectsInObjects": true
+				arraysInObjects  : true,
+				objectsInObjects : true
 			}
 		],
-		"strict": [
-			"warn",
-			"global"
+		'strict' : [
+			'warn',
+			'global'
 		],
-		"yoda": "warn"
+		'yoda' : 'warn'
 	}
 };
diff --git a/test/ajax/doc-with-scripts.html b/test/ajax/doc-with-scripts.html
index 8e5fa6d6..763f2813 100644
--- a/test/ajax/doc-with-scripts.html
+++ b/test/ajax/doc-with-scripts.html
@@ -1,27 +1,28 @@
-<div>
-
-Lorem ipsum dolor sit amet
-
-<script type="text/javascript">
-    // set global var
-    var unitTestVariable1 = true;
-</script>
-
-Lorem ipsum dolor sit amet
-
-<script type="text/javascript">
-    // set another global var
-    var unitTestVariable2 = true;
-</script>
-
-<script type="text/javascript">
-    // set global var
-    if (typeof scriptCount == 'undefined')
-        var scriptCount = 1;
-    else
-        scriptCount++;
-</script>
-
-Lorem ipsum dolor sit amet
-
-</div>
+<!DOCTYPE html>
+<div>
+
+Lorem ipsum dolor sit amet
+
+<script type="text/javascript">
+    // set global var
+    var unitTestVariable1 = true;
+</script>
+
+Lorem ipsum dolor sit amet
+
+<script type="text/javascript">
+    // set another global var
+    var unitTestVariable2 = true;
+</script>
+
+<script type="text/javascript">
+    // set global var
+    if (typeof scriptCount == 'undefined')
+        var scriptCount = 1;
+    else
+        scriptCount++;
+</script>
+
+Lorem ipsum dolor sit amet
+
+</div>
diff --git a/test/ajax/text.html b/test/ajax/text.html
index c06ef4b8..1b0ab84b 100644
--- a/test/ajax/text.html
+++ b/test/ajax/text.html
@@ -1,12 +1,13 @@
-Lorem ipsum dolor sit amet
-consectetuer adipiscing elit
-Sed lorem leo
-lorem leo consectetuer adipiscing elit
-Sed lorem leo
-rhoncus sit amet
-elementum at
-bibendum at, eros
-Cras at mi et tortor egestas vestibulum
-sed Cras at mi vestibulum
-Phasellus sed felis sit amet
-orci dapibus semper.
+<!DOCTYPE html>
+Lorem ipsum dolor sit amet
+consectetuer adipiscing elit
+Sed lorem leo
+lorem leo consectetuer adipiscing elit
+Sed lorem leo
+rhoncus sit amet
+elementum at
+bibendum at, eros
+Cras at mi et tortor egestas vestibulum
+sed Cras at mi vestibulum
+Phasellus sed felis sit amet
+orci dapibus semper.
diff --git a/test/test.html b/test/test.html
index 96783b20..f1677379 100644
--- a/test/test.html
+++ b/test/test.html
@@ -154,8 +154,8 @@
 			<input type="checkbox" name="Check" value="1">
 			<input type="checkbox" name="Check" value="2" checked="checked">
 			<select name="Select">
-				<option value="opt1">
-				<option value="opt2" selected="selected">
+				<option value="opt1" />
+				<option value="opt2" selected="selected" />
 			</select>
 			<input type="submit" value="button">
 		</div>
diff --git a/test/test.js b/test/test.js
index 5f8c9951..c2b936d2 100644
--- a/test/test.js
+++ b/test/test.js
@@ -3,30 +3,34 @@
 'use strict';
 
 // helper method
-var arrayCount = function(arr, key) {
-	var count = 0;
-	for (var i = 0; i < arr.length; i++) {
-		if (arr[i].name === key) {
+const arrayCount = function(arr, key) {
+	let count = 0;
+
+	for (const {name} of arr) {
+		if (name === key) {
 			count++;
 		}
 	}
+
 	return count;
 };
 
 // helper method
-var arrayValue = function(arr, key) {
-	for (var i = 0; i < arr.length; i++) {
-		if (arr[i].name === key) {
-			return arr[i].value;
+const arrayValue = function(arr, key) {
+	for (const {name, value} of arr) {
+		if (name === key) {
+			return value;
 		}
 	}
+
 	return undefined;
 };
 
 
-var assert = chai.assert;
-var fixture;
+const {assert} = chai;
+let fixture;
 
+// eslint-disable-next-line max-statements
 describe('form', function() {
 	before(function() {
 		fixture = $('#main').html();
@@ -38,112 +42,128 @@ describe('form', function() {
 
 
 	it('"action" and "method" form attributes', function() {
-		var f = $('#form1');
-		assert.strictEqual(f.attr('action'), 'ajax/text.html', 'form "action"');
-		assert.strictEqual(f.attr('method'), 'get', 'form "method"');
+		const form = $('#form1');
+
+		assert.strictEqual(form.attr('action'), 'ajax/text.html', 'form "action"');
+		assert.strictEqual(form.attr('method'), 'get', 'form "method"');
 	});
 
 	it('formToArray: multi-select', function() {
-		var a = $('#form1').formToArray();
-		assert.strictEqual(a.constructor, Array, 'type check');
-		assert.strictEqual(a.length, 13, 'array length');
-		assert.strictEqual(arrayCount(a, 'Multiple'), 3, 'multi-select');
+		const arr = $('#form1').formToArray();
+		const expectedLength = 13;
+		const expectedMultipleCount = 3;
+
+		assert.instanceOf(arr, Array, 'type check');
+		assert.strictEqual(arr.length, expectedLength, 'array length');
+		assert.strictEqual(arrayCount(arr, 'Multiple'), expectedMultipleCount, 'multi-select');
 	});
 
 	it('formToArray: "action" and "method" inputs', function() {
-		var a = $('#form1').formToArray();
-		assert.strictEqual(a.constructor, Array, 'type check');
-		assert.strictEqual(arrayValue(a, 'action'), '1', 'input name=action');
-		assert.strictEqual(arrayValue(a, 'method'), '2', 'input name=method');
+		const arr = $('#form1').formToArray();
+
+		assert.instanceOf(arr, Array, 'type check');
+		assert.strictEqual(arrayValue(arr, 'action'), '1', 'input name=action');
+		assert.strictEqual(arrayValue(arr, 'method'), '2', 'input name=method');
 	});
 
 	it('formToArray: semantic test', function() {
-		var formData = $('#form2').formToArray(true);
-		var testData = ['a','b','c','d','e','f'];
-		for (var i = 0; i < 6; i++) {
+		const formData = $('#form2').formToArray(true);
+		const testData = ['a', 'b', 'c', 'd', 'e', 'f'];
+
+		for (let i = 0; i < testData.length; i++) {
 			assert.strictEqual(formData[i].name, testData[i], 'match value at index=' + i);
 		}
 	});
 
 	it('formToArray: text promotion for missing value attributes', function() {
-		var expected = [
-			{ name: 'A', value: ''},
-			{ name: 'B', value: 'MISSING_ATTR'},
-			{ name: 'C', value: ''},
-			{ name: 'C', value: 'MISSING_ATTR'}
+		const expected = [
+			{name: 'A', value: ''},
+			{name: 'B', value: 'MISSING_ATTR'},
+			{name: 'C', value: ''},
+			{name: 'C', value: 'MISSING_ATTR'}
 		];
-		var a = $('#form6').formToArray(true);
+		const arr = $('#form6').formToArray(true);
 
 		// verify all the option values
-		for (var i = 0; i < a.length; i++) {
-			assert.strictEqual(a[i].name, expected[i].name, 'Name: ' + a[i].name + ' = ' + expected[i].name);
-			assert.strictEqual(a[i].value, expected[i].value, 'Value: ' + a[i].value + ' = ' + expected[i].value);
+		for (let i = 0; i < arr.length; i++) {
+			assert.strictEqual(arr[i].name, expected[i].name, 'Name: ' + arr[i].name + ' = ' + expected[i].name);
+			assert.strictEqual(arr[i].value, expected[i].value, 'Value: ' + arr[i].value + ' = ' + expected[i].value);
 		}
 	});
 
 	it('formToArray: outside fields', function() {
-		var formData = $('#form10').formToArray();
-		assert.strictEqual(formData.length, 2, 'There are two "successful" elements of the form');
+		const formData = $('#form10').formToArray();
+		const expectedLength = 2;
+
+		assert.strictEqual(formData.length, expectedLength, 'There are two "successful" elements of the form');
 	});
 
 	// test string serialization
 	it('serialize: param count', function() {
-		var s = $('#form1').formSerialize();
-		assert.ok(s.constructor == String, 'type check');
-		assert.ok(s.split('&').length == 13, 'string array length');
+		const ser = $('#form1').formSerialize();
+		const expectedStringArrayLength = 13;
+
+		assert.instanceOf(ser, String, 'type check');
+		assert.ok(ser.split('&').length === expectedStringArrayLength, 'string array length');
 	});
 
 	// test support for input elements not contained within a form
 	it('serialize: pseudo form', function() {
-		var s = $('#pseudo *').fieldSerialize();
-		assert.ok(s.constructor == String, 'type check');
-		assert.ok(s.split('&').length == 3, 'string array length');
+		const ser = $('#pseudo *').fieldSerialize();
+		const expectedStringArrayLength = 3;
+
+		assert.instanceOf(ser, String, 'type check');
+		assert.ok(ser.split('&').length === expectedStringArrayLength, 'string array length');
 	});
 
 
 	// test resetForm
 	it('resetForm (text input)', function() {
-		var $el = $('#form1 input[name=Name]');
-		var val = $el.val();
-		assert.ok('MyName1' == val, 'beforeSubmit: ' + val);
+		const $el = $('#form1 input[name=Name]');
+		let val = $el.val();
+
+		assert.ok(val === 'MyName1', 'beforeSubmit: ' + val);
 		$el.val('test');
 		val = $el.val();
-		assert.ok('test' == $el.val(), 'update: ' + val);
+		assert.ok($el.val() === 'test', 'update: ' + val);
 		$('#form1').resetForm();
 		val = $el.val();
-		assert.ok('MyName1' == val, 'success: ' + val);
+		assert.ok(val === 'MyName1', 'success: ' + val);
 	});
 
 	// test resetForm
 	it('resetForm (select)', function() {
-		var $el = $('#form1 select[name=Single]');
-		var val = $el.val();
-		assert.ok('one' == val, 'beforeSubmit: ' + val);
+		const $el = $('#form1 select[name=Single]');
+		let val = $el.val();
+
+		assert.ok(val === 'one', 'beforeSubmit: ' + val);
 		$el.val('two');
 		val = $el.val();
-		assert.ok('two' == $el.val(), 'update: ' + val);
+		assert.ok($el.val() === 'two', 'update: ' + val);
 		$('#form1').resetForm();
 		val = $el.val();
-		assert.ok('one' == val, 'success: ' + val);
+		assert.ok(val === 'one', 'success: ' + val);
 	});
 
 	// test resetForm
 	it('resetForm (textarea)', function() {
-		var $el = $('#form1 textarea');
-		var val = $el.val();
-		assert.ok('This is Form1' == val, 'beforeSubmit: ' + val);
+		const $el = $('#form1 textarea');
+		let val = $el.val();
+
+		assert.ok(val === 'This is Form1', 'beforeSubmit: ' + val);
 		$el.val('test');
 		val = $el.val();
-		assert.ok('test' == val, 'udpate: ' + val);
+		assert.ok(val === 'test', 'udpate: ' + val);
 		$('#form1').resetForm();
 		val = $el.val();
-		assert.ok('This is Form1' == val, 'success: ' + val);
+		assert.ok(val === 'This is Form1', 'success: ' + val);
 	});
 
 	// test resetForm
 	it('resetForm (checkbox)', function() {
-		var el = $('#form1 input:checkbox:checked')[0];
-		var val = el.value;
+		const el = $('#form1 input:checkbox:checked')[0];
+		// const val = el.value;
+
 		assert.ok(el.checked, 'beforeSubmit: ' + el.checked);
 		el.checked = false;
 		assert.ok(!el.checked, 'update: ' + el.checked);
@@ -153,8 +173,9 @@ describe('form', function() {
 
 	// test resetForm
 	it('resetForm (radio)', function() {
-		var el = $('#form1 input:radio:checked')[0];
-		var val = el.value;
+		const el = $('#form1 input:radio:checked')[0];
+		// const val = el.value;
+
 		assert.ok(el.checked, 'beforeSubmit: ' + el.checked);
 		el.checked = false;
 		assert.ok(!el.checked, 'update: ' + el.checked);
@@ -165,19 +186,21 @@ describe('form', function() {
 
 	// test clearForm
 	it('clearForm (text input)', function() {
-		var $el = $('#form1 input[name=Name]');
-		var val = $el.val();
-		assert.ok('MyName1' == val, 'beforeSubmit: ' + val);
+		const $el = $('#form1 input[name=Name]');
+		let val = $el.val();
+
+		assert.ok(val === 'MyName1', 'beforeSubmit: ' + val);
 		$('#form1').clearForm();
 		val = $el.val();
-		assert.ok('' == val, 'success: ' + val);
+		assert.ok(val === '', 'success: ' + val);
 	});
 
 	// test clearForm
 	it('clearForm (select)', function() {
-		var $el = $('#form1 select[name=Single]');
-		var val = $el.val();
-		assert.ok('one' == val, 'beforeSubmit: ' + val);
+		const $el = $('#form1 select[name=Single]');
+		let val = $el.val();
+
+		assert.ok(val === 'one', 'beforeSubmit: ' + val);
 		$('#form1').clearForm();
 		val = $el.val();
 		assert.ok(!val, 'success: ' + val);
@@ -185,28 +208,31 @@ describe('form', function() {
 
 	// test clearForm; here we're testing that a hidden field is NOT cleared
 	it('clearForm: (hidden input)', function() {
-		var $el = $('#form1 input:hidden');
-		var val = $el.val();
-		assert.ok('hiddenValue' == val, 'beforeSubmit: ' + val);
+		const $el = $('#form1 input:hidden');
+		let val = $el.val();
+
+		assert.ok(val === 'hiddenValue', 'beforeSubmit: ' + val);
 		$('#form1').clearForm();
 		val = $el.val();
-		assert.ok('hiddenValue' == val, 'success: ' + val);
+		assert.ok(val === 'hiddenValue', 'success: ' + val);
 	});
 
 
 	// test clearForm; here we're testing that a submit element is NOT cleared
 	it('clearForm: (submit input)', function() {
-		var $el = $('#form1 input:submit');
-		var val = $el.val();
-		assert.ok('Submit1' == val, 'beforeSubmit: ' + val);
+		const $el = $('#form1 input:submit');
+		let val = $el.val();
+
+		assert.ok(val === 'Submit1', 'beforeSubmit: ' + val);
 		$('#form1').clearForm();
 		val = $el.val();
-		assert.ok('Submit1' == val, 'success: ' + val);
+		assert.ok(val === 'Submit1', 'success: ' + val);
 	});
 
 	// test clearForm
 	it('clearForm (checkbox)', function() {
-		var el = $('#form1 input:checkbox:checked')[0];
+		const el = $('#form1 input:checkbox:checked')[0];
+
 		assert.ok(el.checked, 'beforeSubmit: ' + el.checked);
 		$('#form1').clearForm();
 		assert.ok(!el.checked, 'success: ' + el.checked);
@@ -214,7 +240,8 @@ describe('form', function() {
 
 	// test clearForm
 	it('clearForm (radio)', function() {
-		var el = $('#form1 input:radio:checked')[0];
+		const el = $('#form1 input:radio:checked')[0];
+
 		assert.ok(el.checked, 'beforeSubmit: ' + el.checked);
 		$('#form1').clearForm();
 		assert.ok(!el.checked, 'success: ' + el.checked);
@@ -224,13 +251,13 @@ describe('form', function() {
 	it('ajaxSubmit: target == String', function() {
 		$('#targetDiv').empty();
 		// stop();
-		var opts = {
-			target: '#targetDiv',
-			success: function() { // post-callback
+		const opts = {
+			success : function() { // post-callback
 				assert.ok(true, 'post-callback');
 				assert.ok($('#targetDiv').text().match('Lorem ipsum'), 'targetDiv updated');
 				// start();
-			}
+			},
+			target : '#targetDiv'
 		};
 
 		// expect(2);
@@ -240,16 +267,17 @@ describe('form', function() {
 	// test passing jQuery object as the target
 	it('ajaxSubmit: target == jQuery object', function() {
 		// stop();
-		var target = $('#targetDiv');
+		const target = $('#targetDiv');
+
 		target.empty();
 
-		var opts = {
-			target: target,
-			success: function(responseText) { // post-callback
+		const opts = {
+			success : function(responseText) { // post-callback
 				assert.ok(true, 'post-callback');
 				assert.ok($('#targetDiv').text().match('Lorem ipsum'), 'targetDiv updated');
 				// start();
-			}
+			},
+			target : target
 		};
 
 		// expect(2);
@@ -260,15 +288,15 @@ describe('form', function() {
 	it('ajaxSubmit: target == DOM element', function() {
 		// stop();
 		$('#targetDiv').empty();
-		var el = $('#targetDiv')[0];
+		// const el = $('#targetDiv')[0];
 
-		var opts = {
-			target: '#targetDiv',
-			success: function(responseText) { // post-callback
+		const opts = {
+			success : function(responseText) { // post-callback
 				assert.ok(true, 'post-callback');
 				assert.ok($('#targetDiv').text().match('Lorem ipsum'), 'targetDiv updated');
 				// start();
-			}
+			},
+			target : '#targetDiv'
 		};
 
 		// expect(2);
@@ -280,18 +308,18 @@ describe('form', function() {
 		// stop();
 		$('#targetDiv').empty();
 
-		var opts = {
-			target: '#targetDiv',
-			url:	'ajax/doc-with-scripts.html?' + new Date().getTime(),
-			success: function(responseText) { // post-callback
+		const opts = {
+			success : function(responseText) { // post-callback
 				assert.ok(true, 'success-callback');
 				assert.ok($('#targetDiv').text().match('Lorem ipsum'), 'targetDiv updated');
-				assert.ok(typeof unitTestVariable1 != 'undefined', 'first script block executed');
-				assert.ok(typeof unitTestVariable2 != 'undefined', 'second script block executed');
-				assert.ok(typeof scriptCount != 'undefined', 'third script block executed');
-				assert.ok(scriptCount == 1, 'scripts executed once: ' + scriptCount);
+				assert.ok(typeof unitTestVariable1 !== 'undefined', 'first script block executed');
+				assert.ok(typeof unitTestVariable2 !== 'undefined', 'second script block executed');
+				assert.ok(typeof scriptCount !== 'undefined', 'third script block executed');
+				assert.ok(scriptCount === 1, 'scripts executed once: ' + scriptCount);
 				// start();
-			}
+			},
+			target : '#targetDiv',
+			url    : 'ajax/doc-with-scripts.html?' + new Date().getTime()
 		};
 
 		// expect(6);
@@ -300,12 +328,12 @@ describe('form', function() {
 
 	// test ajaxSubmit pre-submit callback
 	it('ajaxSubmit: pre-submit callback', function() {
-		var opts = {
-			beforeSubmit: function(a, jq) { // pre-submit callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-submit callback
 				assert.ok(true, 'pre-submit callback');
-				assert.ok(a.constructor == Array, 'type check array');
+				assert.instanceOf(arr, Array, 'type check array');
 				assert.ok(jq.jquery, 'type check jQuery');
-				assert.ok(jq[0].tagName.toLowerCase() == 'form', 'jQuery arg == "form": ' + jq[0].tagName.toLowerCase());
+				assert.ok(jq[0].tagName.toLowerCase() === 'form', 'jQuery arg == "form": ' + jq[0].tagName.toLowerCase());
 			}
 		};
 
@@ -317,11 +345,11 @@ describe('form', function() {
 	it('ajaxSubmit: post-submit callback', function() {
 		// stop();
 
-		var opts = {
-			success: function(responseText, statusText) { // post-submit callback
+		const opts = {
+			success : function(responseText, statusText) { // post-submit callback
 				assert.ok(true, 'post-submit callback');
 				assert.ok(responseText.match('Lorem ipsum'), 'responseText');
-				assert.ok(statusText == 'success', 'statusText');
+				assert.ok(statusText === 'success', 'statusText');
 				// start();
 			}
 		};
@@ -343,18 +371,18 @@ describe('form', function() {
 
 	// test semantic support via ajaxSubmit's pre-submit callback
 	it('ajaxSubmit: semantic test', function() {
-		var testData = ['a','b','c','d','e','f'];
+		const testData = ['a', 'b', 'c', 'd', 'e', 'f'];
 
-		var opts = {
-			semantic: true,
-			beforeSubmit: function(a, jq) { // pre-submit callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-submit callback
 				assert.ok(true, 'pre-submit callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
-				for (var i = 0; i < a.length; i++) {
-					assert.ok(a[i].name == testData[i], 'match value at index=' + i);
+				for (let i = 0; i < arr.length; i++) {
+					assert.ok(arr[i].name === testData[i], 'match value at index=' + i);
 				}
-			}
+			},
+			semantic : true
 		};
 
 		// expect(9);
@@ -365,15 +393,15 @@ describe('form', function() {
 	it('ajaxSubmit: dataType == json', function() {
 		// stop();
 
-		var opts = {
-			url: 'ajax/json.json',
-			dataType: 'json',
-			success: function(data, statusText) { // post-submit callback
+		const opts = {
+			dataType : 'json',
+			success  : function(data, statusText) { // post-submit callback
 				// assert that the json data was evaluated
-				assert.ok(typeof data == 'object', 'json data type');
-				assert.ok(data.name == 'jquery-test', 'json data contents');
+				assert.ok(typeof data === 'object', 'json data type');
+				assert.ok(data.name === 'jquery-test', 'json data contents');
 				// start();
-			}
+			},
+			url : 'ajax/json.json'
 		};
 
 		// expect(2);
@@ -385,14 +413,14 @@ describe('form', function() {
 	it('ajaxSubmit: dataType == script', function() {
 		// stop();
 
-		var opts = {
-			url: 'ajax/script.txt?' + new Date().getTime(), // don't let ie cache it
-			dataType: 'script',
-			success: function(responseText, statusText) { // post-submit callback
-				assert.ok(typeof formScriptTest == 'function', 'script evaluated');
+		const opts = {
+			dataType : 'script',
+			success  : function(responseText, statusText) { // post-submit callback
+				assert.ok(typeof formScriptTest === 'function', 'script evaluated');
 				assert.ok(responseText.match('formScriptTest'), 'script returned');
 				// start();
-			}
+			},
+			url : 'ajax/script.txt?' + new Date().getTime() // don't let ie cache it
 		};
 
 		// expect(2);
@@ -403,14 +431,16 @@ describe('form', function() {
 	it('ajaxSubmit: dataType == xml', function() {
 		// stop();
 
-		var opts = {
-			url: 'ajax/test.xml',
-			dataType: 'xml',
-			success: function(responseXML, statusText) { // post-submit callback
-				assert.ok(typeof responseXML == 'object', 'data type xml');
-				assert.ok($('test', responseXML).length == 3, 'xml data query');
+		const opts = {
+			dataType : 'xml',
+			success  : function(responseXML, statusText) { // post-submit callback
+				const expectedLength = 3;
+
+				assert.ok(typeof responseXML === 'object', 'data type xml');
+				assert.ok($('test', responseXML).length === expectedLength, 'xml data query');
 				// start();
-			}
+			},
+			url : 'ajax/test.xml'
 		};
 
 		// expect(2);
@@ -423,8 +453,8 @@ describe('form', function() {
 	it('ajaxSubmit: existing args in action attr', function() {
 		// stop();
 
-		var opts = {
-			success: function() { // post-submit callback
+		const opts = {
+			success : function() { // post-submit callback
 				assert.ok(true, 'post callback');
 				// start();
 			}
@@ -437,14 +467,15 @@ describe('form', function() {
 	// test ajaxSubmit using pre-submit callback to cancel submit
 	it('ajaxSubmit: cancel submit', function() {
 
-		var opts = {
-			beforeSubmit: function(a, jq) {		// pre-submit callback
+		const opts = {
+			beforeSubmit : function(arr, jq) {		// pre-submit callback
 				assert.ok(true, 'pre-submit callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
+
 				return false;		// return false to abort submit
 			},
-			success: function() {	// post-submit callback
+			success : function() {	// post-submit callback
 				assert.ok(false, 'should not hit this post-submit callback');
 			}
 		};
@@ -457,21 +488,21 @@ describe('form', function() {
 	it('ajaxSubmit: pseudo-form', function() {
 		// stop();
 
-		var opts = {
-			beforeSubmit: function(a, jq) { // pre-submit callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-submit callback
 				assert.ok(true, 'pre-submit callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
-				assert.ok(jq[0].tagName.toLowerCase() == 'div', 'jQuery arg == "div"');
+				assert.ok(jq[0].tagName.toLowerCase() === 'div', 'jQuery arg == "div"');
 			},
-			success: function() { // post-submit callback
+			success : function() { // post-submit callback
 				assert.ok(true, 'post-submit callback');
 				// start();
 			},
+			type : 'post',
 			// url and method must be provided for a pseudo form since they can
 			// not be extracted from the markup
-			url:  'ajax/text.html',
-			type: 'post'
+			url  : 'ajax/text.html'
 		};
 
 		// expect(5);
@@ -482,14 +513,15 @@ describe('form', function() {
 	it('ajaxSubmit: evaluate response', function() {
 		// stop();
 
-		var opts = {
-			success: function(responseText) { // post-callback
+		const opts = {
+			success : function(responseText) { // post-callback
 				assert.ok(true, 'post-callback');
-				var data = eval.call(window, '(' + responseText + ')');
-				assert.ok(data.name == 'jquery-test', 'evaled response');
+				const data = eval.call(window, '(' + responseText + ')');
+
+				assert.ok(data.name === 'jquery-test', 'evaled response');
 				// start();
 			},
-			url: 'ajax/json.txt'
+			url : 'ajax/json.txt'
 		};
 
 		// expect(2);
@@ -501,13 +533,13 @@ describe('form', function() {
 	it('ajaxForm: pre and post callbacks', function() {
 		// stop();
 
-		var opts = {
-			beforeSubmit: function(a, jq) {	// pre-submit callback
+		const opts = {
+			beforeSubmit : function(arr, jq) {	// pre-submit callback
 				assert.ok(true, 'pre-submit callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
 			},
-			success: function() {			// post-submit callback
+			success : function() {			// post-submit callback
 				assert.ok(true, 'post-submit callback');
 				// start();
 			}
@@ -521,12 +553,12 @@ describe('form', function() {
 	// test that the value of the submit button is captured
 	it('ajaxForm: capture submit element', function() {
 
-		var opts = {
-			beforeSubmit: function(a, jq) { // pre-callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-callback
 				assert.ok(true, 'pre-callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
-				assert.ok(arrayValue(a, 'form4inputName') !== null, 'submit button');
+				assert.ok(arrayValue(arr, 'form4inputName') !== null, 'submit button');
 			}
 		};
 
@@ -538,13 +570,13 @@ describe('form', function() {
 	// test image submit support
 	it('ajaxForm: capture submit image coordinates', function() {
 
-		var opts = {
-			beforeSubmit: function(a, jq) { // pre-callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-callback
 				assert.ok(true, 'pre-callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
-				assert.ok(arrayValue(a, 'myImage.x') !== null, 'x coord');
-				assert.ok(arrayValue(a, 'myImage.y') !== null, 'y coord');
+				assert.ok(arrayValue(arr, 'myImage.x') !== null, 'x coord');
+				assert.ok(arrayValue(arr, 'myImage.y') !== null, 'y coord');
 			}
 		};
 
@@ -556,15 +588,15 @@ describe('form', function() {
 	// test image submit support
 	it('ajaxForm: capture submit image coordinates (semantic=true)', function() {
 
-		var opts = {
-			semantic: true,
-			beforeSubmit: function(a, jq) { // pre-callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-callback
 				assert.ok(true, 'pre-callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
-				assert.ok(arrayValue(a, 'myImage.x') !== null, 'x coord');
-				assert.ok(arrayValue(a, 'myImage.y') !== null, 'y coord');
-			}
+				assert.ok(arrayValue(arr, 'myImage.x') !== null, 'x coord');
+				assert.ok(arrayValue(arr, 'myImage.y') !== null, 'y coord');
+			},
+			semantic : true
 		};
 
 		// expect(5);
@@ -577,18 +609,18 @@ describe('form', function() {
 		$('#targetDiv').empty();
 		// stop();
 
-		var opts = {
-			target: '#targetDiv',
-			beforeSubmit: function(a, jq) { // pre-callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-callback
 				assert.ok(true, 'pre-callback');
-				assert.ok(a.constructor == Array, 'type check');
+				assert.instanceOf(arr, Array, 'type check');
 				assert.ok(jq.jquery, 'type check jQuery');
 			},
-			success: function() {
+			success : function() {
 				assert.ok(true, 'post-callback');
 				assert.ok($('#targetDiv').text().match('Lorem ipsum'), 'targetDiv updated');
 				// start();
-			}
+			},
+			target : '#targetDiv'
 		};
 
 		// expect(5);
@@ -600,8 +632,8 @@ describe('form', function() {
 		$('#targetDiv').empty();
 		// stop();
 
-		var opts = {
-			success: function() {
+		const opts = {
+			success : function() {
 				assert.ok(true, 'post-callback');
 				// start();
 			}
@@ -615,15 +647,15 @@ describe('form', function() {
 		$('#targetDiv').empty();
 		// stop();
 
-		var opts = {
-			url: 'ajax/404.html',
-			error: function() {
+		const opts = {
+			error : function() {
 				assert.ok(true, 'error-callback');
 				// start();
 			},
-			success: function() { // post-submit callback
+			success : function() { // post-submit callback
 				assert.ok(false, 'should not hit post-submit callback');
-			}
+			},
+			url : 'ajax/404.html'
 		};
 
 		// expect(1);
@@ -632,154 +664,161 @@ describe('form', function() {
 
 
 	it('fieldValue(true)', function() {
-		var i;
-
-		assert.ok('5'  == $('#fieldTest input').fieldValue(true)[0], 'input');
-		assert.ok('1'  == $('#fieldTest :input').fieldValue(true)[0], ':input');
-		assert.ok('5'  == $('#fieldTest input:hidden').fieldValue(true)[0], ':hidden');
-		assert.ok('14' == $('#fieldTest :password').fieldValue(true)[0], ':password');
-		assert.ok('12' == $('#fieldTest :radio').fieldValue(true)[0], ':radio');
-		assert.ok('1'  == $('#fieldTest select').fieldValue(true)[0], 'select');
-
-		var expected = ['8','10'];
-		var result = $('#fieldTest :checkbox').fieldValue(true);
-		assert.ok(result.length == expected.length, 'result size check (checkbox): ' + result.length + '=' + expected.length);
-		for (i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i]);
+		assert.ok($('#fieldTest input').fieldValue(true)[0] === '5', 'input');
+		assert.ok($('#fieldTest :input').fieldValue(true)[0] === '1', ':input');
+		assert.ok($('#fieldTest input:hidden').fieldValue(true)[0] === '5', ':hidden');
+		assert.ok($('#fieldTest :password').fieldValue(true)[0] === '14', ':password');
+		assert.ok($('#fieldTest :radio').fieldValue(true)[0] === '12', ':radio');
+		assert.ok($('#fieldTest select').fieldValue(true)[0] === '1', 'select');
+
+		let expected = ['8', '10'];
+		let result = $('#fieldTest :checkbox').fieldValue(true);
+
+		assert.ok(result.length === expected.length, 'result size check (checkbox): ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i]);
 		}
 
-		expected = ['3','4'];
+		expected = ['3', '4'];
 		result = $('#fieldTest [name=B]').fieldValue(true);
-		assert.ok(result.length == expected.length, 'result size check (select-multiple): ' + result.length + '=' + expected.length);
-		for (i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i]);
+		assert.ok(result.length === expected.length, 'result size check (select-multiple): ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i]);
 		}
 	});
 
+	// eslint-disable-next-line max-statements
 	it('fieldValue(false)', function() {
-		var i;
-
-		assert.ok('5'  == $('#fieldTest input').fieldValue(false)[0], 'input');
-		assert.ok('1'  == $('#fieldTest :input').fieldValue(false)[0], ':input');
-		assert.ok('5'  == $('#fieldTest input:hidden').fieldValue(false)[0], ':hidden');
-		assert.ok('14' == $('#fieldTest :password').fieldValue(false)[0], ':password');
-		assert.ok('1'  == $('#fieldTest select').fieldValue(false)[0], 'select');
-
-		var expected = ['8','9','10'];
-		var result = $('#fieldTest :checkbox').fieldValue(false);
-		assert.ok(result.length == expected.length, 'result size check (checkbox): ' + result.length + '=' + expected.length);
-		for (i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i]);
+		assert.ok($('#fieldTest input').fieldValue(false)[0] === '5', 'input');
+		assert.ok($('#fieldTest :input').fieldValue(false)[0] === '1', ':input');
+		assert.ok($('#fieldTest input:hidden').fieldValue(false)[0] === '5', ':hidden');
+		assert.ok($('#fieldTest :password').fieldValue(false)[0] === '14', ':password');
+		assert.ok($('#fieldTest select').fieldValue(false)[0] === '1', 'select');
+
+		let expected = ['8', '9', '10'];
+		let result = $('#fieldTest :checkbox').fieldValue(false);
+
+		assert.ok(result.length === expected.length, 'result size check (checkbox): ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i]);
 		}
 
-		expected = ['11','12','13'];
+		expected = ['11', '12', '13'];
 		result = $('#fieldTest :radio').fieldValue(false);
-		assert.ok(result.length == expected.length, 'result size check (radio): ' + result.length + '=' + expected.length);
-		for (i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i]);
+		assert.ok(result.length === expected.length, 'result size check (radio): ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i]);
 		}
 
-		expected = ['3','4'];
+		expected = ['3', '4'];
 		result = $('#fieldTest [name=B]').fieldValue(false);
-		assert.ok(result.length == expected.length, 'result size check (select-multiple): ' + result.length + '=' + expected.length);
-		for (i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i]);
+		assert.ok(result.length === expected.length, 'result size check (select-multiple): ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i]);
 		}
 	});
 
 	it('fieldSerialize(true) input', function() {
-		var expected = ['C=5', 'D=6', 'F=8', 'F=10', 'G=12', 'H=14'];
+		const expected = ['C=5', 'D=6', 'F=8', 'F=10', 'G=12', 'H=14'];
+
+		let result = $('#fieldTest input').fieldSerialize(true);
 
-		var result = $('#fieldTest input').fieldSerialize(true);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
 	it('fieldSerialize(true) :input', function() {
-		var expected = ['A=1','B=3','B=4','C=5','D=6','E=7','F=8','F=10','G=12','H=14'];
+		const expected = ['A=1', 'B=3', 'B=4', 'C=5', 'D=6', 'E=7', 'F=8', 'F=10', 'G=12', 'H=14'];
+
+		let result = $('#fieldTest :input').fieldSerialize(true);
 
-		var result = $('#fieldTest :input').fieldSerialize(true);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
 	it('fieldSerialize(false) :input', function() {
-		var expected = ['A=1','B=3','B=4','C=5','D=6','E=7','F=8','F=9','F=10','G=11','G=12','G=13','H=14','I=15','J=16'];
+		const expected = ['A=1', 'B=3', 'B=4', 'C=5', 'D=6', 'E=7', 'F=8', 'F=9', 'F=10', 'G=11', 'G=12', 'G=13', 'H=14', 'I=15', 'J=16'];
+
+		let result = $('#fieldTest :input').fieldSerialize(false);
 
-		var result = $('#fieldTest :input').fieldSerialize(false);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
 	it('fieldSerialize(true) select-mulitple', function() {
-		var expected = ['B=3','B=4'];
+		const expected = ['B=3', 'B=4'];
+
+		let result = $('#fieldTest [name=B]').fieldSerialize(true);
 
-		var result = $('#fieldTest [name=B]').fieldSerialize(true);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
 	it('fieldSerialize(true) :checkbox', function() {
-		var expected = ['F=8','F=10'];
+		const expected = ['F=8', 'F=10'];
+
+		let result = $('#fieldTest :checkbox').fieldSerialize(true);
 
-		var result = $('#fieldTest :checkbox').fieldSerialize(true);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
 	it('fieldSerialize(false) :checkbox', function() {
-		var expected = ['F=8','F=9','F=10'];
+		const expected = ['F=8', 'F=9', 'F=10'];
+
+		let result = $('#fieldTest :checkbox').fieldSerialize(false);
 
-		var result = $('#fieldTest :checkbox').fieldSerialize(false);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
 	it('fieldSerialize(true) :radio', function() {
-		var expected = ['G=12'];
+		const expected = ['G=12'];
+
+		let result = $('#fieldTest :radio').fieldSerialize(true);
 
-		var result = $('#fieldTest :radio').fieldSerialize(true);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
 	it('fieldSerialize(false) :radio', function() {
-		var expected = ['G=11','G=12','G=13'];
+		const expected = ['G=11', 'G=12', 'G=13'];
+
+		let result = $('#fieldTest :radio').fieldSerialize(false);
 
-		var result = $('#fieldTest :radio').fieldSerialize(false);
 		result = result.split('&');
 
-		assert.ok(result.length == expected.length, 'result size check: ' + result.length + '=' + expected.length);
-		for (var i = 0; i < result.length; i++) {
-			assert.ok(result[i] == expected[i], expected[i] + ' = ' + result[i]);
+		assert.ok(result.length === expected.length, 'result size check: ' + result.length + '=' + expected.length);
+		for (let i = 0; i < result.length; i++) {
+			assert.ok(result[i] === expected[i], expected[i] + ' = ' + result[i]);
 		}
 	});
 
@@ -787,20 +826,21 @@ describe('form', function() {
 		$('#targetDiv').empty();
 		// stop();
 
-		var opts = {
-			target: '#targetDiv',
-			beforeSubmit: function(a, jq) { // pre-callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-callback
 				assert.ok(true, 'pre-callback');
 			},
-			success: function() {
+			success : function() {
 				assert.ok(true, 'post-callback');
 				// start();
-			}
+			},
+			target : '#targetDiv'
 		};
 
 		// expect(2);
 		// multiple binds
-		$('#form8').ajaxForm(opts).ajaxForm(opts).ajaxForm(opts);
+		$('#form8').ajaxForm(opts).ajaxForm(opts)
+			.ajaxForm(opts);
 		$('#submitForm8')[0].click();
 	});
 
@@ -808,15 +848,15 @@ describe('form', function() {
 		$('#targetDiv').empty();
 		// stop();
 
-		var opts = {
-			target: '#targetDiv',
-			beforeSubmit: function(a, jq) { // pre-callback
+		const opts = {
+			beforeSubmit : function(arr, jq) { // pre-callback
 				assert.ok(true, 'pre-callback');
 			},
-			success: function() {
+			success : function() {
 				assert.ok(true, 'post-callback');
 				// start();
-			}
+			},
+			target : '#targetDiv'
 		};
 
 		// expect(0);
@@ -832,7 +872,7 @@ describe('form', function() {
 
 	it('naked hash', function() {
 		$('#actionTest1').ajaxSubmit({
-			beforeSerialize: function($f, opts) {
+			beforeSerialize : function($f, opts) {
 				assert.ok(true, 'url=' + opts.url);
 			}
 		});
@@ -840,7 +880,7 @@ describe('form', function() {
 	});
 	it('hash only', function() {
 		$('#actionTest2').ajaxSubmit({
-			beforeSerialize: function($f, opts) {
+			beforeSerialize : function($f, opts) {
 				assert.ok(true, 'url=' + opts.url);
 			}
 		});
@@ -848,7 +888,7 @@ describe('form', function() {
 	});
 	it('empty action', function() {
 		$('#actionTest3').ajaxSubmit({
-			beforeSerialize: function($f, opts) {
+			beforeSerialize : function($f, opts) {
 				assert.ok(true, 'url=' + opts.url);
 			}
 		});
@@ -856,7 +896,7 @@ describe('form', function() {
 	});
 	it('missing action', function() {
 		$('#actionTest4').ajaxSubmit({
-			beforeSerialize: function($f, opts) {
+			beforeSerialize : function($f, opts) {
 				assert.ok(true, 'url=' + opts.url);
 			}
 		});
@@ -864,7 +904,7 @@ describe('form', function() {
 	});
 
 	it('success callback params', function() {
-		var $testForm;
+		let $testForm;
 
 		$('#targetDiv').empty();
 		// stop();
@@ -872,7 +912,7 @@ describe('form', function() {
 		if (/^1\.3/.test($.fn.jquery)) {
 			// expect(3);
 			$testForm = $('#form3').ajaxSubmit({
-				success: function(data, status, $form) { // jQuery 1.4+ signature
+				success : function(data, status, $form) { // jQuery 1.4+ signature
 					assert.ok(true, 'success callback invoked');
 					assert.ok(status === 'success', 'status === success');
 					assert.ok($form === $testForm, '$form param is valid');
@@ -883,11 +923,11 @@ describe('form', function() {
 		} else {	// if (/^1\.4/.test($.fn.jquery)) {
 			// expect(6);
 			$testForm = $('#form3').ajaxSubmit({
-				success: function(data, status, xhr, $form) { // jQuery 1.4+ signature
+				success : function(data, status, xhr, $form) { // jQuery 1.4+ signature
 					assert.ok(true, 'success callback invoked');
 					assert.ok(status === 'success', 'status === success');
-					assert.ok(true, 'third arg: ' + typeof xhr != undefined);
-					assert.ok(!!xhr != false, 'xhr != false');
+					assert.ok(true, 'third arg: ' + xhr !== undefined);
+					assert.ok(Boolean(xhr) !== false, 'xhr != false');
 					assert.ok(xhr.status, 'xhr.status == ' + xhr.status);
 					assert.ok($form === $testForm, '$form param is valid');
 					// start();
@@ -901,9 +941,9 @@ describe('form', function() {
 		// stop();
 
 		// expect(2);
-		var $testForm = $('#form3').ajaxSubmit({
-			forceSync: true,
-			success: function(data, status, $form) { // jQuery 1.4+ signature
+		/* const $testForm = */ $('#form3').ajaxSubmit({
+			forceSync : true,
+			success   : function(data, status, $form) { // jQuery 1.4+ signature
 				assert.ok(true, 'success callback invoked');
 				assert.ok(status === 'success', 'status === success');
 				// start();