"

From 2014.igem.org

/**

• Unifies event handling across browsers
• - Allows registering and unregistering of event handlers
• - Injects event object and involved DOM element to listener
• @author Mark Rolich <mark.rolich@gmail.com>
• /

var Event = function () {

   "use strict";
   this.attach = function (evtName, element, listener, capture) {
       var evt         = ,
           useCapture  = (capture === undefined) ? true : capture,
           handler     = null;

       if (window.addEventListener === undefined) {
           evt = 'on' + evtName;
           handler = function (evt, listener) {
               element.attachEvent(evt, listener);
               return listener;
           };
       } else {
           evt = evtName;
           handler = function (evt, listener, useCapture) {
               element.addEventListener(evt, listener, useCapture);
               return listener;
           };
       }

       return handler.apply(element, [evt, function (ev) {
           var e   = ev || event,
               src = e.srcElement || e.target;

           listener(e, src);
       }, useCapture]);
   };

   this.detach = function (evtName, element, listener, capture) {
       var evt         = ,
           useCapture  = (capture === undefined) ? true : capture;

       if (window.removeEventListener === undefined) {
           evt = 'on' + evtName;
           element.detachEvent(evt, listener);
       } else {
           evt = evtName;
           element.removeEventListener(evt, listener, useCapture);
       }
   };

   this.stop = function (evt) {
       evt.cancelBubble = true;

       if (evt.stopPropagation) {
           evt.stopPropagation();
       }
   };

   this.prevent = function (evt) {
       if (evt.preventDefault) {
           evt.preventDefault();
       } else {
           evt.returnValue = false;
       }
   };

};