Javascript Code onbeforeunload

[DerKleinePunk]

When i switch in Chrome from a Page with JavaScript onbeforeunload the Code ist Called.
When i do this in my Code and in Sample Code the Code is not Called. How Implement this ?

[amaitland]

When i switch in Chrome from a Page with JavaScript onbeforeunload the Code ist Called.

What do you mean by the code ist called?

Please provide more detail.

[DerKleinePunk]

const beforeUnloadListener = (event) => { event.preventDefault(); console.log("onbeforeunload"); return event.returnValue = "Are you sure you want to exit?"; };

This Java Script ins in the html Page.
I have Implemented the IJsDialogHandler Interface.
I want Close the View and called my Dialog Handler.

I am using HwndHost.ChromiumWebBrowser the Code ist Called wenn Kill the Window but not Waiting until the Dialog is Closed.
The Code ist not Called wenn do to an other Url.
The Code in JsDialogHandler

[amaitland]

This Java Script ins in the html Page.
I have Implemented the IJsDialogHandler Interface.
I want Close the View and called my Dialog Handler.

What does your code look like?

I am using HwndHost.ChromiumWebBrowser the Code ist Called wenn Kill the Window but not Waiting until the Dialog is Closed.

How are you closing the browser. If you are calling Dispose then the behavior you are seeing is expected. You can call

CefSharp/CefSharp/IBrowserHost.cs

Line 47 in c944774

bool TryCloseBrowser();