Helper to live check for input box changes in JavaScript.

onChange.js

$.fn.mwOnChange = function(callback, timeout) {
		return $(this).each(function() {
			if (timeout === undefined) {
				timeout = 500;
			}
			var eventNames = 'keydown paste input';
			var timeoutId = null;

			$(this).on(eventNames, function(e) {
				var self = this;
				if (timeoutId !== null){
					clearTimeout(timeoutId);
				}
				timeoutId = setTimeout(function() {
					callback.apply(self, [e]);
				}, timeout);
			});
		});
	};