Unexpected window.close() behavior

[nnemkin]

When a script calls window.close(), WebView2 destroys itself, leaving an empty black window behind.

I think the reasonable behavior for embedded WebViews would be to fire an event (new API) and do nothing.

[david-risney]

Thanks! Yes it looks like if we inject 'close()' the renderer process will end although the browser, GPU, and utility processes remain.

[douglas-jordan]

I have a background watchdog thread that monitors for this condition and posts a quit message to the main thread, where everything is released.

[pagoe-msft]

@nnemkin and @douglas-jordan,

In our previous SDK release, we added the WindowCloseRequested event that should resolve your scenario. You can check it out here: https://docs.microsoft.com/en-us/microsoft-edge/hosting/webview2/reference/icorewebview2#add_windowcloserequested

[douglas-jordan]

@pagoe-msft
The watchdog thread also has the advantage of handling browser crash recovery and only needed to be slightly augmented to handle WebView2.

[shyjusachin]

Hi @pagoe-msft @douglas-jordan I wanted to get trigger WindowCloseRequested event in one of my WebView2 use case scenario. I have attempted multiple ways but WindowCloseRequested event/event handler is not listing in my WebView2 core libraries. It is a VB.NET application and installed latest nuget version of WebView2 (1.0.1020.30). Could you please let me know how to implement or enable this functionality. Thanks in advance & much appreciated

[champnic]

WindowCloseRequested is fired when the page calls window.close(). How have you tried to do this so far? I've confirmed that WindowCloseRequested is available in Microsoft.Web.WebView2.Core.dll in the 1.0.1020.30 package:

[shyjusachin]

@champnic Thank you for the quick response. In my case I have been using WinForms and events are registered like this

Friend WithEvents WebView21 As Microsoft.Web.WebView2.WinForms.WebView2

And I can able to use some events like this

But here I couldn't use same for WindowCloseRequested. So could you please let me know same is available in WinForms or may I am wrong with some event usage ?. If then could you please provide me sample code of WindowCloseRequested event usage.

[champnic]

@shyjusachin The WindowCloseRequested event is on the WebView2.CoreWebView2 object, and not the WebView2 Winforms control itself. The WebView2 control only contains a subset of the most common events. Thanks!