Hint and prevent the user from going to the page

Question

How does StackOverflow do this when you add a question or answer a question;

I would like to request from the user:

"Are you sure you want to navigate away from this page" "Press OK to continue or Cancel to stay on this page"

I tried a couple of js fragments that I found on the Internet, but nothing cuts the mustard.

+4

Gordonb Apr 14 '10 at 15:59

1 answer

Richiehindle · Accepted Answer · 2010-04-14T16:04:01+0000

You need to implement window.onbeforeunload and return your message from it as a string:

 window.onbeforeunload = function() { if (theUserHasStartedEditing) { return "You have started writing or editing a post." } }