element-plus/packages/test-utils/trigger-event.ts

/**
 * Trigger event
 * mouseenter, mouseleave, mouseover, keyup, change, click
 * @param  {Element} elm
 * @param  {String} name
 * @param  {*} opts
 */
const triggerEvent = (elm, name, ...opts) => {
  let eventName

  if (/^mouse|click/.test(name)) {
    eventName = 'MouseEvents'
  } else if (/^key/.test(name)) {
    eventName = 'KeyboardEvent'
  } else {
    eventName = 'HTMLEvents'
  }
  const evt = document.createEvent(eventName)

  evt.initEvent(name, ...opts)
  elm.dispatchEvent
    ? elm.dispatchEvent(evt)
    : elm.fireEvent('on' + name, evt)

  return elm
}
export default triggerEvent