In javascript I have seen a couple of solutions of how to warn a user that they might lose data if they navigate away from a page.
Has Richfaces made it easy as pie to do this? I am currently on 4.3.2. I don't see anything in their documentation that describes this situation.
https://github.com/codedance/jquery.AreYouSure This jQuery plugin claims to do what I need it to do. It is a bit buggy, but it is a good start.