How to do this kind of confirmation dialog?

Question

I am creating a website, and I want to do like this kind of confirmation dialog.. how can I do this? if the user will going to exit my website while he is processing something there..

I found this kind of confirmation dialog in facebook.

Answer 1

You need to handle beforeunload event. Note that it works differently across browsers.

See sample implementation here: https://gist.github.com/4125388