ASP.NET: Warning on changed data closing windows

Question

I\'d like to warn users when they try to close a browser window if they didn\'t save the changes they made in the web form.

I\'m us

Answer 1

you'll want to leverage off the

window.onbeforeunload

event. Similar to Gmail if you attempt to close the window when you haven't saved a composed email.

Theres some sample JS here.

http://forums.devarticles.com/javascript-development-22/how-to-stop-browser-from-closing-using-javascript-8458.html