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* --------------------------------------------------------------------------
* Bootstrap (v5.0.0-alpha1): dom/event-handler.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
* --------------------------------------------------------------------------
*/
import { getjQuery } from '../util/index'
import { defaultPreventedPreservedOnDispatch } from './polyfill'
/**
* ------------------------------------------------------------------------
* Constants
* ------------------------------------------------------------------------
*/
const $ = getjQuery()
const namespaceRegex = /[^.]*(?=\..*)\.|.*/
const stripNameRegex = /\..*/
const stripUidRegex = /::\d+$/
const eventRegistry = {} // Events storage
let uidEvent = 1
const customEvents = {
mouseenter: 'mouseover',
mouseleave: 'mouseout'
}
const nativeEvents = [
'click',
'dblclick',
'mouseup',
'mousedown',
'contextmenu',
'mousewheel',
'DOMMouseScroll',
'mouseover',
'mouseout',
'mousemove',
'selectstart',
'selectend',
'keydown',
'keypress',
'keyup',
'orientationchange',
'touchstart',
'touchmove',
'touchend',
'touchcancel',
'pointerdown',
'pointermove',
'pointerup',
'pointerleave',
'pointercancel',
'gesturestart',
'gesturechange',
'gestureend',
'focus',
'blur',
'change',
'reset',
'select',
'submit',
'focusin',
'focusout',
'load',
'unload',
'beforeunload',
'resize',
'move',
'DOMContentLoaded',
'readystatechange',
'error',
'abort',
'scroll'
]
/**
* ------------------------------------------------------------------------
* Private methods
* ------------------------------------------------------------------------
*/
function getUidEvent(element, uid) {
return (uid && `${uid}::${uidEvent++}`) || element.uidEvent || uidEvent++
}
function getEvent(element) {
const uid = getUidEvent(element)
element.uidEvent = uid
eventRegistry[uid] = eventRegistry[uid] || {}
return eventRegistry[uid]
}
function bootstrapHandler(element, fn) {
return function handler(event) {
event.delegateTarget = element
if (handler.oneOff) {
EventHandler.off(element, event.type, fn)
}
return fn.apply(element, [event])
}
}
function bootstrapDelegationHandler(element, selector, fn) {
return function handler(event) {
const domElements = element.querySelectorAll(selector)
for (let { target } = event; target && target !== this; target = target.parentNode) {
for (let i = domElements.length; i--;) {
if (domElements[i] === target) {
event.delegateTarget = target
Iif (handler.oneOff) {
EventHandler.off(element, event.type, fn)
}
return fn.apply(target, [event])
}
}
}
// To please ESLint
return null
}
}
function findHandler(events, handler, delegationSelector = null) {
const uidEventList = Object.keys(events)
for (let i = 0, len = uidEventList.length; i < len; i++) {
const event = events[uidEventList[i]]
if (event.originalHandler === handler && event.delegationSelector === delegationSelector) {
return event
}
}
return null
}
function normalizeParams(originalTypeEvent, handler, delegationFn) {
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
}
return [delegation, originalHandler, typeEvent]
}
function addHandler(element, originalTypeEvent, handler, delegationFn, oneOff) {
if (typeof originalTypeEvent !== 'string' || !element) {
return
}
if (!handler) {
handler = delegationFn
delegationFn = null
}
const [delegation, originalHandler, typeEvent] = normalizeParams(originalTypeEvent, handler, delegationFn)
const events = getEvent(element)
const handlers = events[typeEvent] || (events[typeEvent] = {})
const previousFn = findHandler(handlers, originalHandler, delegation ? handler : null)
Iif (previousFn) {
previousFn.oneOff = previousFn.oneOff && oneOff
return
}
const uid = getUidEvent(originalHandler, originalTypeEvent.replace(namespaceRegex, ''))
const fn = delegation ?
bootstrapDelegationHandler(element, handler, delegationFn) :
bootstrapHandler(element, handler)
fn.delegationSelector = delegation ? handler : null
fn.originalHandler = originalHandler
fn.oneOff = oneOff
fn.uidEvent = uid
handlers[uid] = fn
element.addEventListener(typeEvent, fn, delegation)
}
function removeHandler(element, events, typeEvent, handler, delegationSelector) {
const fn = findHandler(events[typeEvent], handler, delegationSelector)
if (!fn) {
return
}
element.removeEventListener(typeEvent, fn, Boolean(delegationSelector))
delete events[typeEvent][fn.uidEvent]
}
function removeNamespacedHandlers(element, events, typeEvent, namespace) {
const storeElementEvent = events[typeEvent] || {}
Object.keys(storeElementEvent).forEach(handlerKey => {
if (handlerKey.indexOf(namespace) > -1) {
const event = storeElementEvent[handlerKey]
removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector)
}
})
}
const EventHandler = {
on(element, event, handler, delegationFn) {
addHandler(element, event, handler, delegationFn, false)
},
one(element, event, handler, delegationFn) {
addHandler(element, event, handler, delegationFn, true)
},
off(element, originalTypeEvent, handler, delegationFn) {
if (typeof originalTypeEvent !== 'string' || !element) {
return
}
const [delegation, originalHandler, typeEvent] = normalizeParams(originalTypeEvent, handler, delegationFn)
const inNamespace = typeEvent !== originalTypeEvent
const events = getEvent(element)
const isNamespace = originalTypeEvent.charAt(0) === '.'
if (typeof originalHandler !== 'undefined') {
// Simplest case: handler is passed, remove that listener ONLY.
Iif (!events || !events[typeEvent]) {
return
}
removeHandler(element, events, typeEvent, originalHandler, delegation ? handler : null)
return
}
if (isNamespace) {
Object.keys(events).forEach(elementEvent => {
removeNamespacedHandlers(element, events, elementEvent, originalTypeEvent.slice(1))
})
}
const storeElementEvent = events[typeEvent] || {}
Object.keys(storeElementEvent).forEach(keyHandlers => {
const handlerKey = keyHandlers.replace(stripUidRegex, '')
if (!inNamespace || originalTypeEvent.indexOf(handlerKey) > -1) {
const event = storeElementEvent[keyHandlers]
removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector)
}
})
},
trigger(element, event, args) {
if (typeof event !== 'string' || !element) {
return null
}
const typeEvent = event.replace(stripNameRegex, '')
const inNamespace = event !== typeEvent
const isNative = nativeEvents.indexOf(typeEvent) > -1
let jQueryEvent
let bubbles = true
let nativeDispatch = true
let defaultPrevented = false
let evt = null
Iif (inNamespace && $) {
jQueryEvent = $.Event(event, args)
$(element).trigger(jQueryEvent)
bubbles = !jQueryEvent.isPropagationStopped()
nativeDispatch = !jQueryEvent.isImmediatePropagationStopped()
defaultPrevented = jQueryEvent.isDefaultPrevented()
}
if (isNative) {
evt = document.createEvent('HTMLEvents')
evt.initEvent(typeEvent, bubbles, true)
} else {
evt = new CustomEvent(event, {
bubbles,
cancelable: true
})
}
// merge custom information in our event
if (typeof args !== 'undefined') {
Object.keys(args).forEach(key => {
Object.defineProperty(evt, key, {
get() {
return args[key]
}
})
})
}
Iif (defaultPrevented) {
evt.preventDefault()
if (!defaultPreventedPreservedOnDispatch) {
Object.defineProperty(evt, 'defaultPrevented', {
get: () => true
})
}
}
Eif (nativeDispatch) {
element.dispatchEvent(evt)
}
Iif (evt.defaultPrevented && typeof jQueryEvent !== 'undefined') {
jQueryEvent.preventDefault()
}
return evt
}
}
export default EventHandler
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