Trying to modify/print a pop-up window with programmatically created content doesn't work if an event handler is attached to NewWindowRequested #409

RichardSteele · 2020-08-27T06:21:03Z

This is another follow-up to issues #134 and #293. The crash is gone now, but the original use case doesn't work.

Following code works as intended if you let WebView2 handle the created pop-up window. If you attach an event handler to NewWindowRequested to create the pop-up window yourself, it doesn't show "Hello World" and doesn't get printed.

var popup = window.open();
popup.document.write('Hello World');
popup.print();

AB#28898656

The text was updated successfully, but these errors were encountered:

champnic · 2020-08-31T02:46:57Z

I've filed an internal bug to investigate. Third time's the charm! We'll verify your full scenario this time.

cgeier · 2020-09-08T19:06:50Z

Note sure of your use, so I'm not sure if it will meet your needs or not, but I created a small demo project that may work for you.

WebView2TestNewWindowRequested.zip

To use the demo:

Open solution in Visual Studio
Select Debug
Select Start Debugging
Click Open Popup Window

*Note: In the demo project, there's no need to enter anything in the URL address bar--the HTML is automatically loaded from the "index.html" file. It's there in case one wants to navigate to a URL, instead of using the HTML that's loaded by default.

Here's an overview:

index.html

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>Popup Window Test</title>

    <script>
        function popupHandler()
        {
            var popup = window.open();
	    popup.document.write('Hello World');
	    popup.print();
        }
    </script>
</head>

<body>
    <p>
        <a href="javascript: popupHandler()">Open Popup Window</a>
    </p>
</body>
</html>

WebView2 control name: webView21

Subscribe to CoreWebView2Ready event (webView21_CoreWebView2Ready)
Initialize CoreWebView2 using await webView21.EnsureCoreWebView2Async(null);

private void webView21_CoreWebView2Ready(object sender, EventArgs e)
{
    //subscribe to event(s) (add event handler)
    webView21.CoreWebView2.NewWindowRequested += CoreWebView2_NewWindowRequested;
}

private void CoreWebView2_NewWindowRequested(object sender, Microsoft.Web.WebView2.Core.CoreWebView2NewWindowRequestedEventArgs e)
{
    //e.Handled = true; // <-- marks the event as handled, which bypasses/ignores the other event handler(s) in index.html (javascript)

}

kumarmohannsn · 2021-01-19T10:48:26Z

When I opened a child window using NewWindowRequested and Marking the event handled as true. child window got opened, then when I click the cancel button in the child window the child window is not closing. and when I inspect the child window javascript it display error as “javascript must not be allowed to close a window that was not opened by that same javascript". it seems in child window unable to get the parent reference . can anyone help me to solve the issue. Note: I tried in latest version of Webview2 (wpf and winform)

champnic · 2021-01-30T01:59:15Z

This is fixed in 1.0.781-prerelease SDK package. Thanks!

RichardSteele mentioned this issue Aug 27, 2020

Trying to open an empty popup window crashes WebView2 if an event handler is attached to NewWindowRequested #293

Closed

champnic added the bug Something isn't working label Aug 31, 2020

champnic mentioned this issue Sep 15, 2020

When I open a child window in my app's window using NewWindowRequested, document.write cannot write the content to the child window #439

Closed

RichardSteele mentioned this issue Jan 1, 2021

window.open() with invalid URL can break the WebView #762

Closed

champnic closed this as completed Jan 30, 2021

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Trying to modify/print a pop-up window with programmatically created content doesn't work if an event handler is attached to NewWindowRequested #409

Trying to modify/print a pop-up window with programmatically created content doesn't work if an event handler is attached to NewWindowRequested #409

RichardSteele commented Aug 27, 2020 •

edited by champnic

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champnic commented Aug 31, 2020

cgeier commented Sep 8, 2020 •

edited

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kumarmohannsn commented Jan 19, 2021

champnic commented Jan 30, 2021

Trying to modify/print a pop-up window with programmatically created content doesn't work if an event handler is attached to NewWindowRequested #409

Trying to modify/print a pop-up window with programmatically created content doesn't work if an event handler is attached to NewWindowRequested #409

Comments

RichardSteele commented Aug 27, 2020 • edited by champnic Loading

champnic commented Aug 31, 2020

cgeier commented Sep 8, 2020 • edited Loading

kumarmohannsn commented Jan 19, 2021

champnic commented Jan 30, 2021

RichardSteele commented Aug 27, 2020 •

edited by champnic

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cgeier commented Sep 8, 2020 •

edited

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