How to display onbeforeunload dialog when appropriate?

Posted by MartyIX on Stack Overflow See other posts from Stack Overflow or by MartyIX
Published on 2010-04-18T19:59:00Z Indexed on 2010/04/18 20:03 UTC
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onbeforeunload

I've got an editor in javascript on my webpage and I would like to ask user if he/she wants to leave the page even if there are unsaved changes.

I know I can add custom message to the "onbeforeunload dialog" this way:

window.onbeforeunload = function() {
  return 'You have unsaved changes!';
}

(Source) but I want to display the dialog only where there really are some unsaved changes. How to do that?

Thanks!

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