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import Util from './util'
/**
* --------------------------------------------------------------------------
* Bootstrap (v4.0.0-alpha.2): dropdown.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* --------------------------------------------------------------------------
*/
const Dropdown = (($) => {
/**
* ------------------------------------------------------------------------
* Constants
* ------------------------------------------------------------------------
*/
const NAME = 'dropdown'
const VERSION = '4.0.0-alpha'
const DATA_KEY = 'bs.dropdown'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'
const JQUERY_NO_CONFLICT = $.fn[NAME]
const Event = {
HIDE : `hide${EVENT_KEY}`,
HIDDEN : `hidden${EVENT_KEY}`,
SHOW : `show${EVENT_KEY}`,
SHOWN : `shown${EVENT_KEY}`,
CLICK : `click${EVENT_KEY}`,
CLICK_DATA_API : `click${EVENT_KEY}${DATA_API_KEY}`,
KEYDOWN_DATA_API : `keydown${EVENT_KEY}${DATA_API_KEY}`
}
const ClassName = {
BACKDROP : 'dropdown-backdrop',
DISABLED : 'disabled',
OPEN : 'open'
}
const Selector = {
BACKDROP : '.dropdown-backdrop',
DATA_TOGGLE : '[data-toggle="dropdown"]',
FORM_CHILD : '.dropdown form',
ROLE_MENU : '[role="menu"]',
ROLE_LISTBOX : '[role="listbox"]',
NAVBAR_NAV : '.navbar-nav',
VISIBLE_ITEMS : '[role="menu"] li:not(.disabled) a, '
+ '[role="listbox"] li:not(.disabled) a'
}
/**
* ------------------------------------------------------------------------
* Class Definition
* ------------------------------------------------------------------------
*/
class Dropdown {
constructor(element) {
this._element = element
this._addEventListeners()
}
// getters
static get VERSION() {
return VERSION
}
// public
toggle() {
if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {
return false
}
let parent = Dropdown._getParentFromElement(this)
let isActive = $(parent).hasClass(ClassName.OPEN)
Dropdown._clearMenus()
if (isActive) {
return false
}
if ('ontouchstart' in document.documentElement &&
(!$(parent).closest(Selector.NAVBAR_NAV).length)) {
// if mobile we use a backdrop because click events don't delegate
let dropdown = document.createElement('div')
dropdown.className = ClassName.BACKDROP
$(dropdown).insertBefore(this)
$(dropdown).on('click', Dropdown._clearMenus)
}
let relatedTarget = { relatedTarget : this }
let showEvent = $.Event(Event.SHOW, relatedTarget)
$(parent).trigger(showEvent)
if (showEvent.isDefaultPrevented()) {
return false
}
this.focus()
this.setAttribute('aria-expanded', 'true')
$(parent).toggleClass(ClassName.OPEN)
$(parent).trigger($.Event(Event.SHOWN, relatedTarget))
return false
}
dispose() {
$.removeData(this._element, DATA_KEY)
$(this._element).off(EVENT_KEY)
this._element = null
}
// private
_addEventListeners() {
$(this._element).on(Event.CLICK, this.toggle)
}
// static
static _jQueryInterface(config) {
return this.each(function () {
let data = $(this).data(DATA_KEY)
if (!data) {
$(this).data(DATA_KEY, (data = new Dropdown(this)))
}
if (typeof config === 'string') {
if (data[config] === undefined) {
throw new Error(`No method named "${config}"`)
}
data[config].call(this)
}
})
}
static _clearMenus(event) {
if (event && event.which === 3) {
return
}
let backdrop = $(Selector.BACKDROP)[0]
if (backdrop) {
backdrop.parentNode.removeChild(backdrop)
}
let toggles = $.makeArray($(Selector.DATA_TOGGLE))
for (let i = 0; i < toggles.length; i++) {
let parent = Dropdown._getParentFromElement(toggles[i])
let relatedTarget = { relatedTarget : toggles[i] }
if (!$(parent).hasClass(ClassName.OPEN)) {
continue
}
if (event && event.type === 'click' &&
(/input|textarea/i.test(event.target.tagName)) &&
($.contains(parent, event.target))) {
continue
}
let hideEvent = $.Event(Event.HIDE, relatedTarget)
$(parent).trigger(hideEvent)
if (hideEvent.isDefaultPrevented()) {
continue
}
toggles[i].setAttribute('aria-expanded', 'false')
$(parent)
.removeClass(ClassName.OPEN)
.trigger($.Event(Event.HIDDEN, relatedTarget))
}
}
static _getParentFromElement(element) {
let parent
let selector = Util.getSelectorFromElement(element)
if (selector) {
parent = $(selector)[0]
}
return parent || element.parentNode
}
static _dataApiKeydownHandler(event) {
if (!/(38|40|27|32)/.test(event.which) ||
/input|textarea/i.test(event.target.tagName)) {
return
}
event.preventDefault()
event.stopPropagation()
if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {
return
}
let parent = Dropdown._getParentFromElement(this)
let isActive = $(parent).hasClass(ClassName.OPEN)
if ((!isActive && event.which !== 27) ||
(isActive && event.which === 27)) {
if (event.which === 27) {
let toggle = $(parent).find(Selector.DATA_TOGGLE)[0]
$(toggle).trigger('focus')
}
$(this).trigger('click')
return
}
let items = $.makeArray($(Selector.VISIBLE_ITEMS))
items = items.filter((item) => {
return item.offsetWidth || item.offsetHeight
})
if (!items.length) {
return
}
let index = items.indexOf(event.target)
if (event.which === 38 && index > 0) { // up
index--
}
if (event.which === 40 && index < items.length - 1) { // down
index++
}
if (!~index) {
index = 0
}
items[index].focus()
}
}
/**
* ------------------------------------------------------------------------
* Data Api implementation
* ------------------------------------------------------------------------
*/
$(document)
.on(Event.KEYDOWN_DATA_API, Selector.DATA_TOGGLE, Dropdown._dataApiKeydownHandler)
.on(Event.KEYDOWN_DATA_API, Selector.ROLE_MENU, Dropdown._dataApiKeydownHandler)
.on(Event.KEYDOWN_DATA_API, Selector.ROLE_LISTBOX, Dropdown._dataApiKeydownHandler)
.on(Event.CLICK_DATA_API, Dropdown._clearMenus)
.on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, Dropdown.prototype.toggle)
.on(Event.CLICK_DATA_API, Selector.FORM_CHILD, (e) => {
e.stopPropagation()
})
/**
* ------------------------------------------------------------------------
* jQuery
* ------------------------------------------------------------------------
*/
$.fn[NAME] = Dropdown._jQueryInterface
$.fn[NAME].Constructor = Dropdown
$.fn[NAME].noConflict = function () {
$.fn[NAME] = JQUERY_NO_CONFLICT
return Dropdown._jQueryInterface
}
return Dropdown
})(jQuery)
export default Dropdown
|