Call a JavaScript function when user leaves a page

I want the function `pageleave()` to be called before the user exits a page. But I can't seem to get it to work correctly, I searched the web for a couple hours and can't find a solution. Here is the code I came up with. It runs when the page loads instead of when the page unloads. window.onbeforeunload = pageleave; function pageleave() { $.post("/ajax/videocanle.php", { videoID: "" }, function(data) { if ( data != "\nsuccess"){ alert ("Sorry but there was an unexpected error, please try again"); } }); } That is the current revision, it still doesn't run the function before the page unloads. The function does work thou, I tested it with a simple input button.

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