Have a "are you sure" when navigating off a page without saving it

[rdunlop]

If a user starts a post, proposal, or discussion and tries to navigate away before hitting post/save, ask them “are you sure you want to leave?”.

I know you talked about implementing this in UDA as well at one point but couldn’t find the email. I imagine there must be a rails gem for this but I didn’t find anything. This is all I got:

https://stackoverflow.com/questions/5088096/rails-3-form-helper-to-prevent-user-from-navigating-away-and-losing-changes

Probably just include the library from the registration site.