Polyfill the EventListener interface in IE8

README.md

EventListener Polyfill

Is IE8 your new IE6? Level the playing field with polyfills.

This script polyfills addEventListener, removeEventListener, and dispatchEvent. It is less than half a kilobyte minified and gzipped.

addEventListener

addEventListener registers a single event listener on a single target.

Syntax

target.addEventListener(type, listener);

type: A string representing the event type to listen for.

listener: The object that receives a notification when an event of the specified type occurs. This must be an object implementing the EventListener interface, or simply a JavaScript function.

It should be noted that useCapture has not been polyfilled.

removeEventListener

removeEventListener unregisters a single event listener on a single target.

Syntax

target.removeEventListener(type, listener);

type: A string representing the event type being removed.

listener: The EventListener object or function to be removed.

It should be noted that useCapture has not been polyfilled.

dispatchEvent

Dispatches an event into the event system. The event is subject to the same capturing and bubbling behavior as directly dispatched events.

Syntax

bool = target.dispatchEvent(event);

event: An event object to be dispatched.

It should be noted that document.createEvent has not been polyfilled.

eventListener.polyfill.js

!window.addEventListener && (function (WindowPrototype, DocumentPrototype, ElementPrototype, addEventListener, removeEventListener, dispatchEvent, registry) {
	WindowPrototype[addEventListener] = DocumentPrototype[addEventListener] = ElementPrototype[addEventListener] = function (type, listener) {
		var target = this;

		registry.unshift([target, type, listener, function (event) {
			event.currentTarget = target;
			event.preventDefault = function () { event.returnValue = false };
			event.stopPropagation = function () { event.cancelBubble = true };
			event.target = event.srcElement || target;

			listener.call(target, event);
		}]);

		this.attachEvent("on" + type, registry[0][3]);
	};

	WindowPrototype[removeEventListener] = DocumentPrototype[removeEventListener] = ElementPrototype[removeEventListener] = function (type, listener) {
		for (var index = 0, register; register = registry[index]; ++index) {
			if (register[0] == this && register[1] == type && register[2] == listener) {
				return this.detachEvent("on" + type, registry.splice(index, 1)[0][3]);
			}
		}
	};

	WindowPrototype[dispatchEvent] = DocumentPrototype[dispatchEvent] = ElementPrototype[dispatchEvent] = function (eventObject) {
		return this.fireEvent("on" + eventObject.type, eventObject);
	};
})(Window.prototype, HTMLDocument.prototype, Element.prototype, "addEventListener", "removeEventListener", "dispatchEvent", []);

eventListener.polyfill.min.js

!window.addEventListener&&function(e,t,n,r,i,s,o){e[r]=t[r]=n[r]=function(e,t){var n=this;o.unshift([n,e,t,function(e){e.currentTarget=n,e.preventDefault=function(){e.returnValue=!1},e.stopPropagation=function(){e.cancelBubble=!0},e.target=e.srcElement||n,t.call(n,e)}]),this.attachEvent("on"+e,o[0][3])},e[i]=t[i]=n[i]=function(e,t){for(var n=0,r;r=o[n];++n)if(r[0]==this&&r[1]==e&&r[2]==t)return this.detachEvent("on"+e,o.splice(n,1)[0][3])},e[s]=t[s]=n[s]=function(e){return this.fireEvent("on"+e.type,e)}}(Window.prototype,HTMLDocument.prototype,Element.prototype,"addEventListener","removeEventListener","dispatchEvent",[])

Можно оптимизировать работу функций таким образом:
//registry = {};

//newEvent :::
var array = registry[type]||(registry[type] = new Array());
array.pop([tagret, listener, function(){.................}]);
this.attachEvent(type, array[array.length-1][2]);

//delEvent::
for(var i=0,sl=registry[type];sl&&sl[i];i++){
if(sl[i][0]===this&&sl[i][2]===func) return this.detachEvent(ev, sl.splice(i,1)[0][3]);
}

Это принесет как минимум два плюса:

1. Метод pop() работает быстрее метода unshift()
2. При удалении события не нужно будет перебирать registry, в которой может быть огромное кол-во событий, а можно будет сразу обратится к registry[type] и вот там уже провести поиск.

@Extramez, great suggestion, but why not English ?

"Object doesn't support this action" in IE8 for listener.call(target, event);

Extramez спасибо! Голова!

I am also getting "Object doesn't support this action" in IE8 for listener.call(target, event); @alexcroox did you solve it?