Problem submitting form on window.unload

Question

I am having a problem submitting form on window unload if form information has been updated (album.updated = true):

window.onunload = function(evnt) {
  if (album         


        

Answer 1

You cannot reliably interact with the server from the unload event.

Sending an AJAX request might be a little more reliable, but should also not be relied on.

Instead, you should handle the onbeforeunload event and return "You have unsaved changes";.
This will instruct the browser to show a confirmation dialog allowing the user to cancel the navigation. (After which he can save manually)