Skip to content

Instantly share code, notes, and snippets.

Created September 19, 2012 06:34
What would you like to do?
Polyfill the EventListener interface in IE8

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 registers a single event listener on a single target.


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 unregisters a single event listener on a single target.


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.


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


bool = target.dispatchEvent(event);

event: An event object to be dispatched.

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

!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.srcElement || 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", []);
!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},||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",[])
Copy link

decebal commented Oct 28, 2015

@Extramez, great suggestion, but why not English ?

Copy link

"Object doesn't support this action" in IE8 for, event);

Copy link

TViT commented Sep 28, 2017

Extramez спасибо! Голова!

Copy link

worthy7 commented Dec 7, 2017

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

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment