CustomEvents/pollyfill.js at master · mauricionobrega/CustomEvents · GitHub

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(function () {
  if ( typeof window.CustomEvent === 'function' ) return false;

  function CustomEvent ( event, params ) {
    params = params || { bubbles: false, cancelable: false, detail: undefined };
    var evt = document.createEvent( 'CustomEvent' );
    evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail );
    return evt;
   }

  CustomEvent.prototype = window.Event.prototype;

  window.CustomEvent = CustomEvent;
})();

function addEvent(el, type, handler) {
  if (el.attachEvent) el.attachEvent('on' + type, handler); else el.addEventListener(type, handler);
}
function removeEvent(el, type, handler) {
  if (el.detachEvent) el.detachEvent('on' + type, handler); else el.removeEventListener(type, handler);
}