Setting onbeforeunload on body element in Chrome and IE using jQuery

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you cannot abort page unload by returning false. you must return string that will be shown to user in a message box, and he decides if he want to leave or stay on the page (by selecting either ‘OK’ or ‘Cancel’ button), so you need to write your code like this:

 window.onbeforeunload = function() {
    return "Are you sure you want to leave this page bla bla bla?"; // you can make this dynamic, ofcourse...
 };

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