Groucho

Know more about your anonymous users. Scalable front-end personalization.

This library uses in-browser localStorage to track people. Client-side activities are stashed, which rely on the presence of on-page meta data in the dataLayer. This is useful for working with heavily cached, non-user-unique pages and adding personalized front-end features on top. Size: just 2k!

Full documentation

Dependencies

1. Selector library, one of...

• jQuery - JS library standard.
  • Tested: 1.5.2, 1.6.4, 1.7.2, 1.8.3, 1.9.1, 1.10.2, 1.11.1, 2.0.3, 2.1.1, 2.1.4
• Zepto - Minimal jQuery alternative (core, callbacks, deferred).
  • Tested: 1.1.0, 1.1.4, 1.1.6

1. In-browser storage abstraction library. Configurable! Tested with...

• jStorage - localStorage or userData [8k].
  • Tested: 0.4.12
• Store.js - localStorage, globalStorage, and userData [3k].
  • Tested: 1.3.17
• simpleStorage - fork of jStorage [6k].
  • Tested: 0.1.3

1. Data Layer Helper - access "dataLayer" properties [2k].
2. JSON2 - old browser JSON methods (if you care) [3k].

(Sizes are minified, pre-gzipped.)

Example Installation

Include the dependencies on your pages, add groucho configs if you want to deviate from defaults, and output your data layer attributes. Your HTML should look a bit like this...

<script src="jquery.min.js"></script>
<script src="json2.min.js"></script>
<script src="jstorage.min.js"></script>
<script src="data-layer-helper.js"></script>
<script src="groucho.min.js"></script>
<script>
  dataLayer = [{
    'pageId' : 123,
    'title' : 'My Cool Page',
    'type' : 'article',
    'tags' : {
      'my_category' : {
        '123' : 'My Term',
        '456' : 'My Other Term'
      },
      'my_types' : {
        '555' : 'My Type',
        '222' : 'Another Type'
      }
    },
    'myProperty' : 'my value'
  }];
</script>
<script>
  var groucho = window.groucho || {};
  groucho.config = {
    'taxonomyProperty': 'tags',
    'trackExtent': 50,
    'favThreshold': 1,
    'trackProperties': ['type', 'tags'],
    'ttl': 0
  };
</script>

Examples

Favorites

React to your visitors' favorite tags/terms.

var taxonomy = 'my_category',
    myFavs = groucho.getFavoriteTerms(taxonomy);

if (myFavs.length > 0) {
  // Pre-fill any marked form elements and the right taxonomy.
  $('input.pre-fill.' + taxonomy).each(function() {
    $(this).val(myFavs[0].name);
  });
}

Results can include multiple terms if their hit counts are equal. Examples just use the first.

Generate all favorites once, then use results several times on the page.

groucho.getFavoriteTerms();
var taxonomy = 'my_category';

if (groucho.favoriteTerms.hasOwnProperty(taxonomy)) {
  // Prune a list to personalize.
  $('ul.peronalized li').each(function() {
    // Data attribute does not match user's favorite.
    if ($(this).data(taxonomy) !== groucho.favoriteTerms[taxonomy][0].id) {
      $(this).addClass('hide');
    }
  });

  // Set an AJAX form filter automatically.
  $('form.personalize select.' + taxonomy).val(
    groucho.favoriteTerms[taxonomy][0].name
  );
  $('form.personalize').submit();
}

Pageview Tracking

Use page view activity tracking to dig through history and alter UX.

var history = groucho.getActivities('browsing'),
    links = $('a.promoted'),
    count = 0;
for (var i in history) {
  // Determine if they've seen a page with a specific property.
  if (history[i].hasOwnProperty('myProperty') count++;
}
// Visually weight content via past behavior.
if (count < 2) links.addClass('featured');
else if (count >= 2 && count < 7) links.addClass('reduced');
else links.addClass('hidden');

Show the last viewed item of a given type. Example is last watched video...

var history = groucho.getActivities('watch');
if (history.length) {
  $.get("videos.json?id=" + history[0].videoId, function(data) {
    $('.recent').html(displayVideo(data));
  });
}

Custom Activities

Register your own tracking activities like this...

// Track your own activities.
$('.my-special-links').bind('click', function (e) {
  groucho.createActivity('my_activity', {
    'linkText' : $(this).text(),
    'myProperty' : $(this).attr('data-property')
  });
});
// Later...
myActivities = groucho.getActivities('my_activity');

Basic User Info

Wait for data availability and user basic user info.

(function ($) {
  $(document).ready(function(){
    groucho.userDeferred = groucho.userDeferred || $.Deferred();
    groucho.userDeferred.done(function () {
      // Act on a specific user property.
      var origin = $.jStorage.get('user.origin');
      adjustSomething(origin.url);
    }
 });
})(jQuery);

Previous examples simplified.

Tasty bite? Try the full docs.

Tests

This library uses QUnit via Phantom for unit testing via Grunt and Istambul for code coverage analysis.

Thanks.

If you've read this far you might have some suggestions. Feel free to send those or make a merge request. Find something wrong with these docs? Please send that along as well. Why groucho? ...because we can tell who you are with those silly glasses on.