How to pass data while opening a Popup V2 when using INavigation

[Skarzag]

Hi,
I'm kind of stuck. I've delayed the update of CommunityToolkit for now because i got no time and no direct solution to pass data to a Popup like with the Popup V1.

This is exactly the same problem and this fellow developer had no working solution : #2693
I've tried many solutions but nothing worked.
The different protagonists of this discussion are speaking about solutions that does not exists to me.

So i just want to repeat the problem...
Before (v1) there was the onPresenting function to pass data to the popup at start
"await _popupService.ShowPopupAsync(onPresenting: vm => vm.Init(initData), ct);"

But now there is no option if you DONT USE SHELL. The community toolkit code cause a crash if you don't provide a Shell.
"ArgumentNullException.ThrowIfNull(shell);"
https://github.com/CommunityToolkit/Maui/blob/main/src/CommunityToolkit.Maui/Services/PopupService.shared.cs

So for now i'm stuck i want to update our app to dotnet 10 and update all package but i can't because of this problem...

Did someone found a solution ?

[bijington]

@Skarzag there is not currently a solution to passing data across to popups using INavigation but I would like to point out that the following comment is inaccurate - there are multiple methods for showing a popup some which take INavigation or Page parameters

But now there is no option if you DONT USE SHELL. The community toolkit code cause a crash if you don't provide a Shell.
"ArgumentNullException.ThrowIfNull(shell);"

[Skarzag]

_So you're saying that :

• there is no solutions to pass data when showing a popup called with await _popupService.ShowPopupAsync(_navigation)
  BUT
• there are multiple methods for showing a popup some which take INavigation or Page parameters_
  to me you're saying the opposite but maybe it's because i'm not a native english speaker

So...I'm lost. Again. Please, can you provide an example ?

Shell can open a popup and pass parameter at opening easily but inavigation can't. I don't understand why this was not done for INavigation.

[bijington]

Sorry if I caused any confusion my point was highlighting your statement about the community toolkit causing a crash if you don't provide a Shell instance - this is not true.

As for the lack of passing data to a popup when using INavigation - I do not know why the old functionality was removed and not replaced with something else. I liked the old approach because it was agnostic to whatever approach you were using (Shell, INavigation, etc.). The Shell based approach now uses IQueryAttributable which is a Shell based interface. I am open to hearing how we could implement something that works for INavigation

[Skarzag]

Hi !
I'm talking about this part of the CommunityToolkit code

According to the code if you want to try to use this function to pass parameters but set shell to null, an exception will throw.
Just to say that i search in the toolkit code too and that it's a serious matter to me, to us, to the community 😅

[bijington]

Ah I see your point. To summarise it is not possible to pass data to Popups without Shell support. The compiler should make this clear if you pass in null but I'm not sure developers should really consider something like that.

As for passing data, I don't have any good suggestions right now. Do you or any other members of the community have suggestions on how to implement it?

[Skarzag]

Sadly no.
I mean, i'll be very happy to use ShowPopup(_navigation, options, navigationParameters), the exact same call but... with navigation.
But no. And now i'm stuck on .net9 and toolkit v11.2.0 until someone give me a way to do that or some developer add this new call :(

[Skarzag]

Thanks to @pictos, I found a solution.

await _popupService.ShowPopupAsync(nav, laPopup); //don't exist
await _popupService.ShowPopupAsync(nav, laPopup); //don't exist
await nav.ShowPopupAsync(laPopup); //exist <<<<

I don't know why this call with a view parameter exist as an extension method of Navigation & Page but not in the PopupService itself.
So now i'm getting a transiant popup from the container that i initiate with data and... pass it to the viewmodel via the famous Opened event. Then nav.ShowPopupAsync();

I've updated my repo with a solution to my problem for those in needs : https://github.com/Skarzag/PopupV2NavigationWithParameters
Hope it will help !

Don't you think you should add the _popupService.ShowPopupAsync(nav, laPopup) to the service ?