A cross-browser custom event module.

CustomEvent.js

/**
 * A cross-browser custom event module.
 */

var global = window;
var NativeCustomEvent = window.CustomEvent;

function isCustomEvent() {
  try {
    var p = new NativeCustomEvent('cat', { detail: { foo: 'bar' } });
    return p.type === 'cat' && p.detail.foo === 'bar';
  } catch (e) {
  }

  return false;
}

if (!isCustomEvent()) {
  // IE >= 9
  if (typeof document.createEvent === 'function') {

    global.CustomEvent = function (type, params) {
      var e = document.createEvent('CustomEvent');

      if (params) {
        e.initCustomEvent(type, params.bubbles, params.cancelable, params.detail);
      } else {
        e.initCustomEvent(type, false, false, void 0);
      }
      return e;
    };
  } else {

    // IE6-8
    global.CustomEvent = function (type, params) {
      var e = document.createEventObject();

      e.type = type;

      if (params) {
        e.bubbles = Boolean(params.bubbles);
        e.cancelable = Boolean(params.cancelable);
        e.detail = params.detail;
      } else {
        e.bubbles = false;
        e.cancelable = false;
        e.detail = void 0;
      }

      return e;
    };
  }
}

// Trigger a custom event
var triggerInput = function (elem, eventName) {
  var event = new CustomEvent(eventName);

  if (isCustomEvent() || (typeof document.createEvent === 'function')) {
    elem.dispatchEvent(event);
  } else if (elem.attachEvent) {

    if (!elem[eventName]) {
      elem[eventName] = 1;

      elem.attachEvent('onpropertychange', function(e) {
        if (e.propertyName === eventName) {
          elem['on' + eventName] && elem['on' + eventName](evebt);
        }
      });
    }

    elem[eventName]++;
  }
};