isEventSupported.js

/**
 * Check if an event is supported.
 * Ref: http://perfectionkills.com/detecting-event-support-without-browser-sniffing/
 */
function isEventSupported(event) {
  var testEl = document.createElement('div');
  var isSupported;

  event = 'on' + event;
  isSupported = (event in testEl);

  if (!isSupported) {
    testEl.setAttribute(event, 'return;');
    isSupported = typeof testEl[event] === 'function';
  }
  testEl = null;

  return isSupported;
}