Bind and Trigger Custom and Native Events in Prototype

bind.trigger.prototype.js

	/**
	 * Bind and Trigger custom and native events in Prototype
	 * @author Juriy Zaytsev (kangax)
	 * @author Benjamin Lupton (balupton)
	 * @copyright MIT license
	 **/
	(function(){

		var eventMatchers = {
			'HTMLEvents': /^(?:load|unload|abort|error|select|hashchange|popstate|change|submit|reset|focus|blur|resize|scroll)$/,
			'MouseEvents': /^(?:click|mouse(?:down|up|over|move|out))$/
		};
		var defaultOptions = {
			pointerX: 0,
			pointerY: 0,
			button: 0,
			ctrlKey: false,
			altKey: false,
			shiftKey: false,
			metaKey: false,
			bubbles: true,
			cancelable: true
		};

		Event.hasNativeEvent = function(element, eventName) {
			var eventType = null;
			element = $(element);
			for (var name in eventMatchers) {
				if ( eventMatchers[name].test(eventName) ) {
					eventType = name;
					break;
				}
			}
			return eventType ? true : false;
		};

		Event.bind = function(element, eventName, eventHandler) {
			element = $(element);

			if ( Element.hasNativeEvent(element,eventName) ) {
				return Element.observe(element,eventName,eventHandler);
			}
			else {
				return Element.observe(element,'custom:'+eventName,eventHandler);
			}
		};

		Event.simulate = function(element, eventName) {
			var options = Object.extend(defaultOptions, arguments[2] || { });
			var oEvent, eventType = null;

			element = $(element);

			for (var name in eventMatchers) {
				if (eventMatchers[name].test(eventName)) { eventType = name; break; }
			}

			if ( !eventType ) {
				return Element.fire(element,'custom:'+eventName);
			}

			if (document.createEvent) {
				oEvent = document.createEvent(eventType);
				if (eventType == 'HTMLEvents') {
					oEvent.initEvent(eventName, options.bubbles, options.cancelable);
				}
				else {
					oEvent.initMouseEvent(eventName, options.bubbles, options.cancelable, document.defaultView,
						options.button, options.pointerX, options.pointerY, options.pointerX, options.pointerY,
						options.ctrlKey, options.altKey, options.shiftKey, options.metaKey, options.button, element);
				}
				element.dispatchEvent(oEvent);
			}
			else {
				options.clientX = options.pointerX;
				options.clientY = options.pointerY;
				oEvent = Object.extend(document.createEventObject(), options);
				element.fireEvent('on' + eventName, oEvent);
			}
			return element;
		};

		Element.addMethods({
			simulate: Event.simulate,
			trigger: Event.simulate,
			bind: Event.bind,
			hasNativeEvent: Event.hasNativeEvent
		});
	})();

internet explorer throws an error on trigger when "element" is "window". window.fireEvent doesn't work. We could add some check for "window"...