From last few hours I was facing a problem with window.onbeforeunload . My need was to save form data(partial saving) by ajax, in case user opts to close the browser, reload the window or close the window. I was using following code : //Old Code window.onbeforeunload = function () { saveFormData(); return msg; }; It was saving my content but the return statement was showing me a confirmation message with options ‘ Leave Page ’ and ‘ Stay on Page ’. It was so embarrassing. Without return statement it was not saving my data at all. After spending lot of time on internet and brainstorming a little found the following solution: //New Code $(window).bind('beforeunload', function () { //this will work only for Chrome saveFormData(); }); $(window).bind("unload", function () { //this will work for other browsers saveFormData(); }); It worked like a charm for me. Hopefully it