Definitive way to trigger keypress events with jQuery

Slightly more concise now with jQuery 1.6+:

var e = jQuery.Event( 'keydown', { which: $.ui.keyCode.ENTER } );

$('input').trigger(e);

(If you're not using jQuery UI, sub in the appropriate keycode instead.)

If you want to trigger the keypress or keydown event then all you have to do is:

var e = jQuery.Event("keydown");
e.which = 50; // # Some key code value
$("input").trigger(e);