Prefix EventListener

prefixEventListener.js

/**
 * Capitalize
 */
const capitalize = string => {
  return string.charAt(0).toUpperCase() + string.slice(1);
};
  
/**
 * Prefix EventListener
 */
const prefixEventListener = (element, event, cb, addListener = true) => {
  const listener = addListener ? 'addEventListener' : 'removeEventListener';
  return ['webkit', 'moz', 'MS', 'o', '']
    .map(prefix => prefix ? prefix + capitalize(event) : event)
    .forEach(event => element[listener](event, cb));
}

// example add event listener
prefixEventListener(element, 'transitionEnd', fn);

// example remove event listener
prefixEventListener(element, 'transitionEnd', fn, false);