1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
|
import $ from 'jquery'
import Popper from 'popper.js'
import Util from './util'
/**
* --------------------------------------------------------------------------
* Bootstrap (v4.0.0-beta): dropdown.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* --------------------------------------------------------------------------
*/
const Dropdown = (() => {
/**
* Check for Popper dependency
* Popper - https://popper.js.org
*/
if (typeof Popper === 'undefined') {
throw new Error('Bootstrap dropdown require Popper.js (https://popper.js.org)')
}
/**
* ------------------------------------------------------------------------
* Constants
* ------------------------------------------------------------------------
*/
const NAME = 'dropdown'
const VERSION = '4.0.0-beta'
const DATA_KEY = 'bs.dropdown'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'
const JQUERY_NO_CONFLICT = $.fn[NAME]
const ESCAPE_KEYCODE = 27 // KeyboardEvent.which value for Escape (Esc) key
const SPACE_KEYCODE = 32 // KeyboardEvent.which value for space key
const TAB_KEYCODE = 9 // KeyboardEvent.which value for tab key
const ARROW_UP_KEYCODE = 38 // KeyboardEvent.which value for up arrow key
const ARROW_DOWN_KEYCODE = 40 // KeyboardEvent.which value for down arrow key
const RIGHT_MOUSE_BUTTON_WHICH = 3 // MouseEvent.which value for the right button (assuming a right-handed mouse)
const REGEXP_KEYDOWN = new RegExp(`${ARROW_UP_KEYCODE}|${ARROW_DOWN_KEYCODE}|${ESCAPE_KEYCODE}`)
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}${DATA_API_KEY}`,
KEYUP_DATA_API : `keyup${EVENT_KEY}${DATA_API_KEY}`
}
const ClassName = {
DISABLED : 'disabled',
SHOW : 'show',
DROPUP : 'dropup',
MENURIGHT : 'dropdown-menu-right',
MENULEFT : 'dropdown-menu-left'
}
const Selector = {
DATA_TOGGLE : '[data-toggle="dropdown"]',
FORM_CHILD : '.dropdown form',
MENU : '.dropdown-menu',
NAVBAR_NAV : '.navbar-nav',
VISIBLE_ITEMS : '.dropdown-menu .dropdown-item:not(.disabled)'
}
const AttachmentMap = {
TOP : 'top-start',
TOPEND : 'top-end',
BOTTOM : 'bottom-start',
BOTTOMEND : 'bottom-end'
}
const Default = {
offset : 0,
flip : true
}
const DefaultType = {
offset : '(number|string|function)',
flip : 'boolean'
}
/**
* ------------------------------------------------------------------------
* Class Definition
* ------------------------------------------------------------------------
*/
class Dropdown {
constructor(element, config) {
this._element = element
this._popper = null
this._config = this._getConfig(config)
this._menu = this._getMenuElement()
this._inNavbar = this._detectNavbar()
this._addEventListeners()
}
// getters
static get VERSION() {
return VERSION
}
static get Default() {
return Default
}
static get DefaultType() {
return DefaultType
}
// public
toggle() {
if (this._element.disabled || $(this._element).hasClass(ClassName.DISABLED)) {
return
}
const parent = Dropdown._getParentFromElement(this._element)
const isActive = $(this._menu).hasClass(ClassName.SHOW)
Dropdown._clearMenus()
if (isActive) {
return
}
const relatedTarget = {
relatedTarget : this._element
}
const showEvent = $.Event(Event.SHOW, relatedTarget)
$(parent).trigger(showEvent)
if (showEvent.isDefaultPrevented()) {
return
}
let element = this._element
// for dropup with alignment we use the parent as popper container
if ($(parent).hasClass(ClassName.DROPUP)) {
if ($(this._menu).hasClass(ClassName.MENULEFT) || $(this._menu).hasClass(ClassName.MENURIGHT)) {
element = parent
}
}
this._popper = new Popper(element, this._menu, this._getPopperConfig())
// if this is a touch-enabled device we add extra
// empty mouseover listeners to the body's immediate children;
// only needed because of broken event delegation on iOS
// https://www.quirksmode.org/blog/archives/2014/02/mouse_event_bub.html
if ('ontouchstart' in document.documentElement &&
!$(parent).closest(Selector.NAVBAR_NAV).length) {
$('body').children().on('mouseover', null, $.noop)
}
this._element.focus()
this._element.setAttribute('aria-expanded', true)
$(this._menu).toggleClass(ClassName.SHOW)
$(parent)
.toggleClass(ClassName.SHOW)
.trigger($.Event(Event.SHOWN, relatedTarget))
}
dispose() {
$.removeData(this._element, DATA_KEY)
$(this._element).off(EVENT_KEY)
this._element = null
this._menu = null
if (this._popper !== null) {
this._popper.destroy()
}
this._popper = null
}
update() {
this._inNavbar = this._detectNavbar()
if (this._popper !== null) {
this._popper.scheduleUpdate()
}
}
// private
_addEventListeners() {
$(this._element).on(Event.CLICK, (event) => {
event.preventDefault()
event.stopPropagation()
this.toggle()
})
}
_getConfig(config) {
config = $.extend(
{},
this.constructor.Default,
$(this._element).data(),
config
)
Util.typeCheckConfig(
NAME,
config,
this.constructor.DefaultType
)
return config
}
_getMenuElement() {
if (!this._menu) {
const parent = Dropdown._getParentFromElement(this._element)
this._menu = $(parent).find(Selector.MENU)[0]
}
return this._menu
}
_getPlacement() {
const $parentDropdown = $(this._element).parent()
let placement = AttachmentMap.BOTTOM
// Handle dropup
if ($parentDropdown.hasClass(ClassName.DROPUP)) {
placement = AttachmentMap.TOP
if ($(this._menu).hasClass(ClassName.MENURIGHT)) {
placement = AttachmentMap.TOPEND
}
} else if ($(this._menu).hasClass(ClassName.MENURIGHT)) {
placement = AttachmentMap.BOTTOMEND
}
return placement
}
_detectNavbar() {
return $(this._element).closest('.navbar').length > 0
}
_getPopperConfig() {
const offsetConf = {}
if (typeof this._config.offset === 'function') {
offsetConf.fn = (data) => {
data.offsets = $.extend({}, data.offsets, this._config.offset(data.offsets) || {})
return data
}
} else {
offsetConf.offset = this._config.offset
}
const popperConfig = {
placement : this._getPlacement(),
modifiers : {
offset : offsetConf,
flip : {
enabled : this._config.flip
}
}
}
// Disable Popper.js for Dropdown in Navbar
if (this._inNavbar) {
popperConfig.modifiers.applyStyle = {
enabled: !this._inNavbar
}
}
return popperConfig
}
// static
static _jQueryInterface(config) {
return this.each(function () {
let data = $(this).data(DATA_KEY)
const _config = typeof config === 'object' ? config : null
if (!data) {
data = new Dropdown(this, _config)
$(this).data(DATA_KEY, data)
}
if (typeof config === 'string') {
if (typeof data[config] === 'undefined') {
throw new Error(`No method named "${config}"`)
}
data[config]()
}
})
}
static _clearMenus(event) {
if (event && (event.which === RIGHT_MOUSE_BUTTON_WHICH ||
event.type === 'keyup' && event.which !== TAB_KEYCODE)) {
return
}
const toggles = $.makeArray($(Selector.DATA_TOGGLE))
for (let i = 0; i < toggles.length; i++) {
const parent = Dropdown._getParentFromElement(toggles[i])
const context = $(toggles[i]).data(DATA_KEY)
const relatedTarget = {
relatedTarget : toggles[i]
}
if (!context) {
continue
}
const dropdownMenu = context._menu
if (!$(parent).hasClass(ClassName.SHOW)) {
continue
}
if (event && (event.type === 'click' &&
/input|textarea/i.test(event.target.tagName) || event.type === 'keyup' && event.which === TAB_KEYCODE)
&& $.contains(parent, event.target)) {
continue
}
const hideEvent = $.Event(Event.HIDE, relatedTarget)
$(parent).trigger(hideEvent)
if (hideEvent.isDefaultPrevented()) {
continue
}
// if this is a touch-enabled device we remove the extra
// empty mouseover listeners we added for iOS support
if ('ontouchstart' in document.documentElement) {
$('body').children().off('mouseover', null, $.noop)
}
toggles[i].setAttribute('aria-expanded', 'false')
$(dropdownMenu).removeClass(ClassName.SHOW)
$(parent)
.removeClass(ClassName.SHOW)
.trigger($.Event(Event.HIDDEN, relatedTarget))
}
}
static _getParentFromElement(element) {
let parent
const selector = Util.getSelectorFromElement(element)
if (selector) {
parent = $(selector)[0]
}
return parent || element.parentNode
}
static _dataApiKeydownHandler(event) {
if (!REGEXP_KEYDOWN.test(event.which) || /button/i.test(event.target.tagName) && event.which === SPACE_KEYCODE ||
/input|textarea/i.test(event.target.tagName)) {
return
}
event.preventDefault()
event.stopPropagation()
if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {
return
}
const parent = Dropdown._getParentFromElement(this)
const isActive = $(parent).hasClass(ClassName.SHOW)
if (!isActive && (event.which !== ESCAPE_KEYCODE || event.which !== SPACE_KEYCODE) ||
isActive && (event.which === ESCAPE_KEYCODE || event.which === SPACE_KEYCODE)) {
if (event.which === ESCAPE_KEYCODE) {
const toggle = $(parent).find(Selector.DATA_TOGGLE)[0]
$(toggle).trigger('focus')
}
$(this).trigger('click')
return
}
const items = $(parent).find(Selector.VISIBLE_ITEMS).get()
if (!items.length) {
return
}
let index = items.indexOf(event.target)
if (event.which === ARROW_UP_KEYCODE && index > 0) { // up
index--
}
if (event.which === ARROW_DOWN_KEYCODE && index < items.length - 1) { // down
index++
}
if (index < 0) {
index = 0
}
items[index].focus()
}
}
/**
* ------------------------------------------------------------------------
* Data Api implementation
* ------------------------------------------------------------------------
*/
$(document)
.on(Event.KEYDOWN_DATA_API, Selector.DATA_TOGGLE, Dropdown._dataApiKeydownHandler)
.on(Event.KEYDOWN_DATA_API, Selector.MENU, Dropdown._dataApiKeydownHandler)
.on(`${Event.CLICK_DATA_API} ${Event.KEYUP_DATA_API}`, Dropdown._clearMenus)
.on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, function (event) {
event.preventDefault()
event.stopPropagation()
Dropdown._jQueryInterface.call($(this), '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 () {
$.fn[NAME] = JQUERY_NO_CONFLICT
return Dropdown._jQueryInterface
}
return Dropdown
})($, Popper)
export default Dropdown
|