I'm trying to fire a keyboard event to a page using javascript on Chrome.
I had an approach that used to work on Firefox:

pressKey = function(key, shift) {

  var evt = document.createEvent('KeyboardEvent');

  evt.initKeyEvent(keypress, false, true, null, false, false,

                   shift, false, keyCode(key), key.charCodeAt(0));

  document.dispatchEvent(evt);

}

where key is the desired key and keyCode changes lowercase letters into highercase and also calls charCodeAt().

My problem is that events on Safari/Chrome don't have initKeyEvent, but initKeyboardEvent. The main difference I could notice was that you have to pass the key as a keyIdentifier (which looks like a unicode character) instead of passing the keycode and the keychar. Nonetheless I still can't manage to make it work.

I've also tried the JQuery approach described here without success.

EDIT:
I debugged this a little further and it seems that the event on Chrome does trigger the listeners, but keyCode/charCode is always 0. I've tried to set evt.keyCode or evt.charCode with no success either.