triggerEvent.js

/**
 * Trigger a CustomEvent
 *
 * @param {EventTarget} el The element or EventTarget to trigger the event upon
 * @param {String} type The event type name
 * @param {Object|null} detail=null The event data to be sent
 * @returns {Boolean} The return value is false if at least one event listener called preventDefault(). Otherwise it returns true.
 */
export default function triggerEvent (el, type, detail = null) {
  let event;

  // This check is needed to polyfill CustomEvent on IE11-
  if (typeof window.CustomEvent === 'function') {
    event = new CustomEvent(type, {
      detail,
      cancelable: true
    });
  } else {
    event = document.createEvent('CustomEvent');
    event.initCustomEvent(type, true, true, detail);
  }

  return el.dispatchEvent(event);
}