I have a form where the input fields are saved onChange. In Firefox (5) this works even when the window is closed, but for Chrome and IE it doesn't and I need to be sure that I'm saving this data even if they try to close the window after they've typed in a field but an onBlur event hasn't occurred (i.e. they've typed something into a textbox, but haven't tabbed out of it).

I have read the following SO articles on using window.onbeforeunload: article 1 article 2

if I use the following:

window.onbeforeunload = function() {
    return "onbeforeunload";
}

then I get a popup with onbeforeunload in.

but if I try:

window.onbeforeunload = function() {
    alert("onbeforeunload");
}

then nothing happens in any browser, even Firefox.

what I want to achieve is:

window.onbeforeunload = function() {
    saveFormData();
}

I'd be grateful if someone could point out where I might be going wrong.

javascript dom-events
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