JS: JS for PD Event Util

gistfile1

var EventUtil = {
	addHandler: function(element, type, handler){
		if (element.addEventListener){
			element.addEventListener(type, handler, false);
		} else if (element.attachEvent){
			element.attachEvent("on" + type, handler);
		} else {
			element["on" + type] = handler;
		}
	},

	removeHandler: function(element, type, handler){
		if (element.removeEventListener){
			element.removeEventListener(type, handler, false);
		} else if (element.detachEvent){
			element.detachEvent("on" + type, handler);
		} else {
			element["on" + type] = null;	
		}
	},

	getEvent: function(event){
		return event ? event : window.event;
	},

	getTarget: function(event){
		return event.target || event.srcElement;
	},

	getRelatedTarget: function(event) {
		if (event.relatedTarget) {
			return event.relatedTarget;
		} else if (event.toElement) {
			return event.toElement;
		} else if (event.fromElement) {
			return event.fromElement;
		} else {
			return null;
		}
	},

	getButton: function(event) {
		if (document.implementation.hasFeature("MouseEvents", "2.0")) {
			return event.button;
		} else {
			switch (event.button) {
				case 0:
				case 1:
				case 3:
				case 5:
				case 7:
					return 0;
				case 2:
				case 6:
					return 2;
				case 4:
					return 1;
			}
		}
	},

	getWheelDelta: function(event) {
		if (event.wheelDelta) {
			return (client.engine.opera && client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta);
		} else {
			return -event.detail * 40;
		}
	},

	preventDefault: function(event){
		if (event.preventDefault){
			event.preventDefault();
		} else {
			event.returnValue = false;
		}
	},

	getCharCode: function(event){
		if (typeof event.charCode == "number") {
			return event.charCode;
		} else {
			return event.keyCode;
		}
	},

	stopPropagation: function(event){
		if (event.stopPropagation){
			event.stopPropagation();
		} else {
			event.cancelBubble = true;
		}
	},

	getClipboardText: function(event){
		var clipboardData = (event.clipboardData || window.clipboardData);
		return clipboardData.getData("text");
	},

	setClipboardText: function(event, value){
		if (event.clipboardData){
			return event.clipboardData.setData("text/plain", value);
		} else if (window.clipboardData){
			return window.clipboardData.setData("text", value);
		}
	},
};

var client = function() {
	var engine = {
		// rendering engines
		ie: 0,
		gecko: 0,
		webkit: 0,
		khtml: 0,
		opera: 0,

		// special version
		ver: null
	};

	var browser = {
		// browsers
		ie: 0,
		firefox: 0,
		safari: 0,
		konq: 0,
		opera: 0,
		chrome: 0,

		// specific version
		ver: null
	};

	// detection of rendering engines/platforms/devices here

	return {
		engine: engine,
		browser: browser
	};
}();