Catch / Trigger browser back button event using javascript

Posted: April 30, 2013 in web
    <script>
    window.onbeforeunload = function (e) {
        var e = e || window.event;
        var msg = "Do you really want to leave this page?"
        // For IE and Firefox
        if (e) {
            e.returnValue = msg;
        }
        // For Safari / chrome
        return msg;
     };
    </script>
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