Synchronous prompt on CustomScriptDialogOpening WebView2

Description

I’m developing a MAUI application in C# that implements a WebView2 and I need to change the style of the alert, prompt, and confirm dialogs. In WinUI applications everything is very modern, avoiding synchrony, but apparently only when it suits Microsoft, let me explain: If I do:

webView.CoreWebView2.Settings.AreDefaultScriptDialogsEnabled = false;
webView.CoreWebView2.ScriptDialogOpening += CustomScriptDialogOpening;

I can intercept the default JavaScript dialogs, but even if the CustomScriptDialogOpening function is async, the WebView doesn’t await it.

So,

How the heck can I make a prompt if I can’t await it, And there’s no way to launch the user prompt window synchronously, and if I launch it asynchronously, WebView2 doesn’t await it?

I don’t know if this has a solution… Thank you!

Steps to Reproduce

Create MAUI project with windows support. Add webview. Set AreDefaultScriptDialogsEnabled = false add Event on ScriptDialogOpening

Link to public reproduction project repository

https://github.com/MicrosoftEdge/WebView2Feedback

Version with bug

6.0.312

Last version that worked well

6.0.312

Affected platforms

Windows

Affected platform versions

Windows

Did you find any workaround?

No response

Relevant log output

No response

[OMendozaG]

¡Ah, me gustaría presentarles a mi querido amigo GetDeferral()! Para WebView2 (¿y tal vez otras cosas en WinUI?) Si desea hacer cosas asíncronas en un controlador de eventos, debe hacer lo siguiente:

1. Llame y guarde el resultado dee.GetDeferral()
2. Haga su trabajo asíncrono (por ejemplo, usando C# async/await)
3. Cuando haya terminado, invoque Complete()el objeto de aplazamiento que guardó

Vea un ejemplo aquí en el código BlazorWebView que se ejecuta en WinUI:

https://github.com/dotnet/maui/blob/2b823f8503748f115028e671b4fff9048628c462/src/BlazorWebView/src/Maui/Windows/WinUIWebViewManager.cs#L80-L166

(Está manejando un evento WebView2 diferente, pero el patrón es exactamente el mismo).

True…

My mistake due to ignorance.

I didn’t know this. It was so easy, and I didn’t know how to find the answer. Thank you Eilon. And thank you for the work you do with HybridWebview.

We had something similar in Xamarin, and your project encouraged us to switch to MAUI. 😃

Thanks again.

[Eilon]

You’re quite welcome. When I started using WebView2 it was the first time I saw this pattern as well, and was quite surprised by it!