How do I find out which DOM element has the focus?

Question

I would like to find out, in JavaScript, which element currently has focus. I\'ve been looking through the DOM and haven\'t found what I need, yet. Is there a way to do this

Answer 1

Just putting this here to give the solution I eventually came up with.

I created a property called document.activeInputArea, and used jQuery's HotKeys addon to trap keyboard events for arrow keys, tab and enter, and I created an event handler for clicking into input elements.

Then I adjusted the activeInputArea every time focus changed, so I could use that property to find out where I was.

It's easy to screw this up though, because if you have a bug in the system and focus isn't where you think it is, then its very hard to restore the correct focus.