addEventListener-polyfill.js

//addEventListener polyfill 1.0 / Eirik Backer / MIT Licence : Improved by brunoais
(function(win, doc) {
    if (win.addEventListener) {
        return;
    }
    //No need to polyfill
    function docHijack(p) {
        var old = doc[p];
        doc[p] = function(v) {
            return addListen(old(v));
        };
    }
    function addEvent(on, fn, self) {
        // There are events IE does not support. This will translate those to the best option available
        switch (on) {
          case "DOMContentLoaded":
            on = "load";
            break;
        }
        return (self = this).attachEvent("on" + on, function(e) {
            e = e || win.event;
            e.preventDefault = e.preventDefault || function() {
                e.returnValue = false;
            };
            e.stopPropagation = e.stopPropagation || function() {
                e.cancelBubble = true;
            };
            e.target = e.srcElement;
            e.relatedTarget = e.toElement;
            fn.call(self, e);
        });
    }
    function addListen(obj, i) {
        if (i = obj.length) {
            while (i--) {
                obj[i].addEventListener = addEvent;
            }
        } else {
            obj.addEventListener = addEvent;
        }
        return obj;
    }
    addListen([ doc, win ]);
    if ("Element" in win) {
    	// IE8
        win.Element.prototype.addEventListener = addEvent;
    } else {
        // IE < 8
        doc.attachEvent("onreadystatechange", function() {
            addListen(doc.all);
        });
        // Make sure we also init at domReady
        docHijack("getElementsByTagName");
        docHijack("getElementById");
        docHijack("createElement");
        addListen(doc.all);
    }
})(window, document);