Source code

    function setUpEventListening() {
        var addEventListener, removeEventListener, eventListeners = [];
        window.EventTarget ? (addEventListener = window.EventTarget.prototype.addEventListener, removeEventListener = window.EventTarget.prototype.removeEventListener, window.EventTarget.prototype.addEventListener = function(event, callback, bubble) {
            return addEventListener.call(this, event, Canadarm.watch(callback), bubble)
        }, window.EventTarget.prototype.removeEventListener = function(event, callback, bubble) {
            return removeEventListener.call(this, event, Canadarm.watch(callback), bubble)
        }) : window.Element && window.Element.prototype && window.Element.prototype.attachEvent && window.Element.prototype.addEventListener === undefined && (Event.prototype.preventDefault || (Event.prototype.preventDefault = function() {
            this.returnValue = !1
        }), Event.prototype.stopPropagation || (Event.prototype.stopPropagation = function() {
            this.cancelBubble = !0
        }), Element.prototype.addEventListener || (addEventListener = function(type, listener) {
            var self = this,
                wrapper = function(e) {
                    e.target = e.srcElement, e.currentTarget = self, listener.handleEvent ? listener.handleEvent(e) : listener.call(self, e)
                };
            "DOMContentLoaded" !== type && (this.attachEvent("on" + type, Canadarm.watch(wrapper)), eventListeners.push({
                object: this,
                type: type,
                listener: listener,
                wrapper: wrapper
            }))
        }, removeEventListener = function(type, listener) {
            for (var eventListener, counter = 0; counter < eventListeners.length;) {
                if (eventListener = eventListeners[counter], eventListener.object == this && eventListener.type === type && eventListener.listener == listener) {
                    "DOMContentLoaded" !== type && this.detachEvent("on" + type, Canadarm.watch(eventListener.wrapper)), eventListeners.splice(counter, 1);
                    break
                }++counter
            }
        }, Element.prototype.addEventListener = addEventListener, Element.prototype.removeEventListener = removeEventListener))
    }