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Editorial Team
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Asked: 2026-05-31T07:54:19+00:00

Is it possible to cancel the browser close window event? Or at least add

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Is it possible to cancel the browser close window event? Or at least add a message prompting the user whether they are sure they want to leave the page? I tried doing this with the beforeunload event, but it still closes the browser. I am looking for something similar to Microsoft’s exchange website.

Thanks!

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1 Answer

  1. Editorial Team

    Here is an Html Code:

    <html>
<head>
<script language="javascript" type="text/javascript">
window.onbeforeunload = askConfirm;
function askConfirm(){
        return "You have unsaved changes.";
        }
</script>
</head>
<body>
</body>
</html>

    Paste this code into the text area on this page: http://www.htmlpreview.richiebrownlee.com press the button, then exit out of the page that comes up..

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