addEventListener.polyfill.js

if ( 'function' !== typeof window.addEventListener ) {

      (function ( win, doc ) {
          function docHijack( p ) {
              var old = doc[p];
              doc[ p ] = function ( v ) {
                  return addListen( old( v ) );
              };
          }

          function addEvent ( on, fn, self ) {
              return ( self = this ).attachEvent( 'on' + on, function ( e ) {
                  var ev = e || win.event;
                  ev.preventDefault = ev.preventDefault || function () {
                      ev.returnValue = false;
                  };
                  ev.stopPropagation = ev.stopPropagation || function () {
                      ev.cancelBubble = true;
                  };
                  fn.call( self, ev );
              });
          }

          function addListen ( obj, i ) {
              i = obj.length;
              if ( i ) {
                  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
              //Make sure we also init at domReady
              doc.attachEvent( 'onreadystatechange', function () {
                  addListen( doc.all );
              });
              docHijack( 'getElementsByTagName' );
              docHijack( 'getElementById' );
              docHijack( 'createElement' );
              addListen( doc.all );
          }
      }( window, document ));
  }