iEvent

emulates the eventListener interface in objects that don't support it natively

for example:

// given an object like
var obj = {}

// you can add the both the ie-like and eventListener interfaces in this way:
window.iEvent.call(obj, true); // true for emulate the ie event interface, otherwise the argument can be omitted

// and then you can store handler by doing:
obj.addEventListener('goofy', function(e){console.log('addEventListener',arguments)});
obj.attachEvent('ongoofy', function(e){console.log('attachEvent',arguments)});
obj.ongoofy = function(e){console.log('ongoofy',arguments)};

// after that you may want do something else...

// finaly fire the event in the fashon you prefer
obj.dispatchEvent(new Event('goofy'));
obj.fireEvent('ongoofy');

will dispaly

ongoofy [Event]
addEventListener [Event]
attachEvent [Event]
ongoofy [Event]
addEventListener [Event]
attachEvent [Event]

There is also a 'registerEvent' function that can be added to the interface by providing another boolean argument after the ie one, registerEvent create a key and associate it to the handler list, then return the key. When dispatchEvent (or fireEvent) is called, you need to provide the key after the event argument:

var obj = {}
// the first boolean is for ie 8 support (attachEvent, detachEvent and fireEvent)
// the second boolean is for the registerEvent interface that allows you to trigger an event only with using a key generated by the `registerEvent` method
window.iEvent.call(obj, true, true ); 
var k = obj.registerEvent('cabbage'); // generates a key for the 'cabbage' and store it in the k variable

obj.addEventListener('cabbage', function(){console.log(arguments)});

// ...

obj.dispatchEvent(new Event('cabbage')); // will not work...
obj.dispatchEvent(new Event('cabbage'), k); // ...because for dispatch the cabbage event you need to pass the key
// you can also do it with obj.fireEvent('oncabbage', k) if the ie interface is loaded

It is also possible to pass additional arguments in ( dispatch || fire )Event they will be passed to the handlers.

By default it add the missing interface to window, document and Element.prototype if you want to avoid this behaviour, then you need to edit the polifil comment (delete the / at the end of the comment at line 8)