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Polyfill for IE8 Javascript Event Listeners
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(function() { | |
if (!Event.prototype.preventDefault) { | |
Event.prototype.preventDefault=function() { | |
this.returnValue=false; | |
}; | |
} | |
if (!Event.prototype.stopPropagation) { | |
Event.prototype.stopPropagation=function() { | |
this.cancelBubble=true; | |
}; | |
} | |
if (!Element.prototype.addEventListener) { | |
var eventListeners=[]; | |
var addEventListener=function(type,listener /*, useCapture (will be ignored) */) { | |
var self=this; | |
var wrapper=function(e) { | |
e.target=e.srcElement; | |
e.currentTarget=self; | |
if (listener.handleEvent) { | |
listener.handleEvent(e); | |
} else { | |
listener.call(self,e); | |
} | |
}; | |
if (type=="DOMContentLoaded") { | |
var wrapper2=function(e) { | |
if (document.readyState=="complete") { | |
wrapper(e); | |
} | |
}; | |
document.attachEvent("onreadystatechange",wrapper2); | |
eventListeners.push({object:this,type:type,listener:listener,wrapper:wrapper2}); | |
if (document.readyState=="complete") { | |
var e=new Event(); | |
e.srcElement=window; | |
wrapper2(e); | |
} | |
} else { | |
this.attachEvent("on"+type,wrapper); | |
eventListeners.push({object:this,type:type,listener:listener,wrapper:wrapper}); | |
} | |
}; | |
var removeEventListener=function(type,listener /*, useCapture (will be ignored) */) { | |
var counter=0; | |
while (counter<eventListeners.length) { | |
var eventListener=eventListeners[counter]; | |
if (eventListener.object==this && eventListener.type==type && eventListener.listener==listener) { | |
if (type=="DOMContentLoaded") { | |
this.detachEvent("onreadystatechange",eventListener.wrapper); | |
} else { | |
this.detachEvent("on"+type,eventListener.wrapper); | |
} | |
break; | |
} | |
++counter; | |
} | |
}; | |
Element.prototype.addEventListener=addEventListener; | |
Element.prototype.removeEventListener=removeEventListener; | |
if (HTMLDocument) { | |
HTMLDocument.prototype.addEventListener=addEventListener; | |
HTMLDocument.prototype.removeEventListener=removeEventListener; | |
} | |
if (Window) { | |
Window.prototype.addEventListener=addEventListener; | |
Window.prototype.removeEventListener=removeEventListener; | |
} | |
} | |
})(); |
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