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Editorial Team
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Asked: 2026-05-25T15:59:08+00:00

I am trying to display confirmation box using window.confirm on window unload event. If

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I am trying to display confirmation box using window.confirm on window unload event.

If a user clicks on the OK button on confirmation box then I want to call one function and if user clicks the CANCEL button then window should be get closed.

My code is:

<script>
        function confirmit(){
                var result=window.confirm("Are you sure?");
                if(result) {
                    // close all child windows
                } else{
                    // window should not get close
                }
            }
</script>
<body onunload='confirmit();' >

But the problem is if I click on CANCEL button, window is getting closed.

Please help me.

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1 Answer

  1. Editorial Team

    You can’t prevent unload to stop the page from unloading. You need to bind to onbeforeunload instead. You should just return the string you want to display to the user from the event handler (note that in some browsers the string may not be displayed)

    <script type="text/javascript">
    window.onbeforeunload = function(e){
        var msg = 'Are you sure?';
        e = e || window.event;

        if(e)
            e.returnValue = msg;

        return msg;
    }
</script>

    More info here

    JSFiddle Example here

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