Open popup from view model

[imsam67]

Is there a way to open popup from a viewmodel? The documentation indicates that it can only be opened from a ContentPage but I was wondering if there’s a workaround.

[VladislavAntonyuk]

Pop up is UI element, but you can still call it from view model:
Application.Current.MainPage.ShowPopup(popup)

[kphillpotts]

I think it depends on how much of an MVVM-Purist™ you are. 😉 I'm a pragmatist, so personally I'd be more than happy to go with the approach suggested by @VladislavAntonyuk.

But if you are a purist and want to decouple UI elements from your ViewModels then another option would be to create a IPopupService which you inject into your ViewModels. Something like this:

create interface

public interface IPopupService
{
	void ShowPopup(Popup popup);
}

create implementation

public class PopupService : IPopupService
{
	public void ShowPopup(Popup popup)
	{
		Page page = Application.Current?.MainPage ?? throw new NullReferenceException();
		page.ShowPopup(popup);
	}
}

don't forget to register it

services.AddTransient<IPopupService, PopupService> ();

inject service into your viewmodel and use it

	public PopupAnchorViewModel(IPopupService popupService)
	{
		this.popupService = popupService;
	}

        // and then somewhere (probably in a command)...
        popupService.ShowPopup(popup);	

But that's a lot of code, and in reality, you probably aren't really achieving much.

So yeah, for my money you could go with what @VladislavAntonyuk said, which is pretty much how it's done in the Sample App ViewModels. I just thought it would be interesting to discuss an alternate approach.

[VladislavAntonyuk]

In my production app I use the implementation which you suggested, because I can always replace the dialog service implementation without touching the whole app where direct Popup service is used. But anyway because we depends on Page which is UI element, you will probably implement you DialogService in MAUI app

[imsam67]

Thank you all for your help! Works nicely and I really appreciate the detailed example of creating a service. I really like that approach!

[bijington]

I guess if we are talking about Purists someone might argue that the Popup is view based and we should abstract that away 🤣

[kphillpotts]

That's why I'm not an MVVM Purist™

[CliffAgius]

Closed as answered