eventHandler.js 9.23 KiB
import Util from '../util'
/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.0.0-beta): dom/eventHandler.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */
// defaultPrevented is broken in IE.
// https://connect.microsoft.com/IE/feedback/details/790389/event-defaultprevented-returns-false-after-preventdefault-was-called
const workingDefaultPrevented = (() => {
  const e = document.createEvent('CustomEvent')
  e.initEvent('Bootstrap', true, true)
  e.preventDefault()
  return e.defaultPrevented
})()
// CustomEvent polyfill for IE (see: https://mzl.la/2v76Zvn)
if (typeof window.CustomEvent !== 'function') {
  window.CustomEvent = (event, params) => {
    params = params || {
      bubbles: false,
      cancelable: false,
      detail: null
    const evt = document.createEvent('CustomEvent')
    evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail)
    if (!workingDefaultPrevented) {
      const origPreventDefault = Event.prototype.preventDefault
      evt.preventDefault = () => {
        if (!evt.cancelable) {
          return
        origPreventDefault.call(evt)
        Object.defineProperty(evt, 'defaultPrevented', {
          get() {
            return true
          configurable: true
    return evt
  window.CustomEvent.prototype = window.Event.prototype
// Event constructor shim
if (!window.Event || typeof window.Event !== 'function') {
  const origEvent = window.Event
  window.Event = (inType, params) => {
    params = params || {}
    const e = document.createEvent('Event')
    e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable))
    return e
  window.Event.prototype = origEvent.prototype
const namespaceRegex = /[^.]*(?=\..*)\.|.*/
const stripNameRegex = /\..*/
const keyEventRegex  = /^key/
const stripUidRegex  = /::\d+$/
// Events storage
const eventRegistry = {}
let uidEvent = 1
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function getUidEvent(element, uid) { return element.uidEvent = uid && `${uid}::${uidEvent++}` || element.uidEvent || uidEvent++ } function getEvent(element) { const uid = getUidEvent(element) return eventRegistry[uid] = eventRegistry[uid] || {} } const nativeEvents = [ 'click', 'dblclick', 'mouseup', 'mousedown', 'contextmenu', 'mousewheel', 'DOMMouseScroll', 'mouseover', 'mouseout', 'mousemove', 'selectstart', 'selectend', 'keydown', 'keypress', 'keyup', 'orientationchange', 'touchstart', 'touchmove', 'touchend', 'touchcancel', 'gesturestart', 'gesturechange', 'gestureend', 'focus', 'blur', 'change', 'reset', 'select', 'submit', 'focusin', 'focusout', 'load', 'unload', 'beforeunload', 'resize', 'move', 'DOMContentLoaded', 'readystatechange', 'error', 'abort', 'scroll' ] const customEvents = { mouseenter: 'mouseover', mouseleave: 'mouseout' } function fixEvent(event) { // Add which for key events if (event.which === null && keyEventRegex.test(event.type)) { event.which = event.charCode !== null ? event.charCode : event.keyCode } return event } function bootstrapHandler(element, fn) { return function (event) { event = fixEvent(event) return fn.apply(element, [event]) } } function bootstrapDelegationHandler(element, selector, fn) { return function (event) { event = fixEvent(event) const domElements = element.querySelectorAll(selector) for (let target = event.target; target && target !== this; target = target.parentNode) { for (let i = domElements.length; i--;) { if (domElements[i] === target) { return fn.apply(target, [event]) } } } // To please ESLint return null } } function removeHandler(element, events, typeEvent, handler) { const uidEvent = handler.uidEvent const fn = events[typeEvent][uidEvent] element.removeEventListener(typeEvent, fn, fn.delegation) delete events[typeEvent][uidEvent] } function removeNamespacedHandlers(element, events, typeEvent, namespace) { const storeElementEvent = events[typeEvent] || {} for (const handlerKey in storeElementEvent) { if (!Object.prototype.hasOwnProperty.call(storeElementEvent, handlerKey)) {
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continue } if (handlerKey.indexOf(namespace) > -1) { removeHandler(element, events, typeEvent, storeElementEvent[handlerKey].originalHandler) } } } const EventHandler = { on(element, originalTypeEvent, handler, delegationFn) { if (typeof originalTypeEvent !== 'string' || (typeof element === 'undefined' || element === null)) { return } const delegation = typeof handler === 'string' const originalHandler = delegation ? delegationFn : handler // allow to get the native events from namespaced events ('click.bs.button' --> 'click') let typeEvent = originalTypeEvent.replace(stripNameRegex, '') const custom = customEvents[typeEvent] if (custom) { typeEvent = custom } const isNative = nativeEvents.indexOf(typeEvent) > -1 if (!isNative) { typeEvent = originalTypeEvent } const events = getEvent(element) const handlers = events[typeEvent] || (events[typeEvent] = {}) const uid = getUidEvent(originalHandler, originalTypeEvent.replace(namespaceRegex, '')) if (handlers[uid]) { return } const fn = !delegation ? bootstrapHandler(element, handler) : bootstrapDelegationHandler(element, handler, delegationFn) fn.isDelegation = delegation handlers[uid] = fn originalHandler.uidEvent = uid fn.originalHandler = originalHandler element.addEventListener(typeEvent, fn, delegation) }, one(element, event, handler) { function complete(e) { EventHandler.off(element, event, complete) handler.apply(element, [e]) } EventHandler.on(element, event, complete) }, off(element, originalTypeEvent, handler) { if (typeof originalTypeEvent !== 'string' || (typeof element === 'undefined' || element === null)) { return } const events = getEvent(element) let typeEvent = originalTypeEvent.replace(stripNameRegex, '') const inNamespace = typeEvent !== originalTypeEvent const custom = customEvents[typeEvent] if (custom) { typeEvent = custom } const isNative = nativeEvents.indexOf(typeEvent) > -1
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if (!isNative) { typeEvent = originalTypeEvent } if (typeof handler !== 'undefined') { // Simplest case: handler is passed, remove that listener ONLY. if (!events || !events[typeEvent]) { return } removeHandler(element, events, typeEvent, handler) return } const isNamespace = originalTypeEvent.charAt(0) === '.' if (isNamespace) { for (const elementEvent in events) { if (!Object.prototype.hasOwnProperty.call(events, elementEvent)) { continue } removeNamespacedHandlers(element, events, elementEvent, originalTypeEvent.substr(1)) } } const storeElementEvent = events[typeEvent] || {} for (const keyHandlers in storeElementEvent) { if (!Object.prototype.hasOwnProperty.call(storeElementEvent, keyHandlers)) { continue } const handlerKey = keyHandlers.replace(stripUidRegex, '') if (!inNamespace || originalTypeEvent.indexOf(handlerKey) > -1) { removeHandler(element, events, typeEvent, storeElementEvent[keyHandlers].originalHandler) } } }, trigger(element, event, args) { if (typeof event !== 'string' || (typeof element === 'undefined' || element === null)) { return null } const typeEvent = event.replace(stripNameRegex, '') const inNamespace = event !== typeEvent const isNative = nativeEvents.indexOf(typeEvent) > -1 const $ = Util.jQuery let jQueryEvent let bubbles = true let nativeDispatch = true let defaultPrevented = false if (inNamespace && typeof $ !== 'undefined') { jQueryEvent = new $.Event(event, args) $(element).trigger(jQueryEvent) bubbles = !jQueryEvent.isPropagationStopped() nativeDispatch = !jQueryEvent.isImmediatePropagationStopped() defaultPrevented = jQueryEvent.isDefaultPrevented() } let evt = null if (isNative) { evt = document.createEvent('HTMLEvents') evt.initEvent(typeEvent, true, true) } else {
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evt = new CustomEvent(event, { bubbles, cancelable: true }) } // merge custom informations in our event if (typeof args !== 'undefined') { evt = Util.extend(evt, args) } if (defaultPrevented) { evt.preventDefault() } if (nativeDispatch) { element.dispatchEvent(evt) } if (evt.defaultPrevented && typeof jQueryEvent !== 'undefined') { jQueryEvent.preventDefault() } return evt } } // focusin and focusout polyfill if (typeof window.onfocusin === 'undefined') { (() => { function listenerFocus(event) { EventHandler.trigger(event.target, 'focusin') } function listenerBlur(event) { EventHandler.trigger(event.target, 'focusout') } EventHandler.on(document, 'focus', 'input', listenerFocus) EventHandler.on(document, 'blur', 'input', listenerBlur) })() } export default EventHandler