keydown event on a iframe

Question

How i can get keydown event on iframe?

Answer 1

It's so late to answer but maybe is useful for somebody .
I've same problem,that means I've an iframe inside a HTML page in a same domain.
Now I need to get the Esc keyup event.
however I don't want (or some times I can't) to write any script inside iframe body.
to do it, I use below script to detect what is the parent id of element that selected by clicked on it.

 $(window).load(function () {
            jQuery(jQuery('[id="frame"]')[0].contentWindow.document).on('keyup', function (e) {

                var _currntItem = ($(e.target))

                if (e.keyCode === 27) {
                    alert(_currntItem.parent().attr('id'));
                }
            }); 

This code resolved my problem.
hope to useful.