Trying to detect browser close event

Question

I have tried many methods to detect browser close event through jQuery or JavaScript. But, unfortunately, I have not been able to detect the close. The onbeforeunload<

Answer 1

Following script will give message on Chrome and IE:

Chrome

IE

on Firefox you will get generic message

Mechanism is synchronous so no server calls to delay will work, you still can prepare a mechanism like modal window that is shown if user decides to stay on page, but no way to prevent him from leaving.

Response to question in comment

F5 will fire event again, so will Atl+F4.