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
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
|
/**
* --------------------------------------------------------------------------
* Bootstrap (v5.0.0-alpha3): dropdown.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
* --------------------------------------------------------------------------
*/
import * as Popper from '@popperjs/core'
import {
getjQuery,
onDOMContentLoaded,
getElementFromSelector,
isElement,
isVisible,
isRTL,
noop,
typeCheckConfig
} from './util/index'
import Data from './dom/data'
import EventHandler from './dom/event-handler'
import Manipulator from './dom/manipulator'
import SelectorEngine from './dom/selector-engine'
import BaseComponent from './base-component'
/**
* ------------------------------------------------------------------------
* Constants
* ------------------------------------------------------------------------
*/
const NAME = 'dropdown'
const DATA_KEY = 'bs.dropdown'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'
const ESCAPE_KEY = 'Escape'
const SPACE_KEY = 'Space'
const TAB_KEY = 'Tab'
const ARROW_UP_KEY = 'ArrowUp'
const ARROW_DOWN_KEY = 'ArrowDown'
const RIGHT_MOUSE_BUTTON = 2 // MouseEvent.button value for the secondary button, usually the right button
const REGEXP_KEYDOWN = new RegExp(`${ARROW_UP_KEY}|${ARROW_DOWN_KEY}|${ESCAPE_KEY}`)
const EVENT_HIDE = `hide${EVENT_KEY}`
const EVENT_HIDDEN = `hidden${EVENT_KEY}`
const EVENT_SHOW = `show${EVENT_KEY}`
const EVENT_SHOWN = `shown${EVENT_KEY}`
const EVENT_CLICK = `click${EVENT_KEY}`
const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`
const EVENT_KEYDOWN_DATA_API = `keydown${EVENT_KEY}${DATA_API_KEY}`
const EVENT_KEYUP_DATA_API = `keyup${EVENT_KEY}${DATA_API_KEY}`
const CLASS_NAME_DISABLED = 'disabled'
const CLASS_NAME_SHOW = 'show'
const CLASS_NAME_DROPUP = 'dropup'
const CLASS_NAME_DROPEND = 'dropend'
const CLASS_NAME_DROPSTART = 'dropstart'
const CLASS_NAME_MENUEND = 'dropdown-menu-end'
const CLASS_NAME_NAVBAR = 'navbar'
const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="dropdown"]'
const SELECTOR_FORM_CHILD = '.dropdown form'
const SELECTOR_MENU = '.dropdown-menu'
const SELECTOR_NAVBAR_NAV = '.navbar-nav'
const SELECTOR_VISIBLE_ITEMS = '.dropdown-menu .dropdown-item:not(.disabled):not(:disabled)'
const PLACEMENT_TOP = isRTL ? 'top-end' : 'top-start'
const PLACEMENT_TOPEND = isRTL ? 'top-start' : 'top-end'
const PLACEMENT_BOTTOM = isRTL ? 'bottom-end' : 'bottom-start'
const PLACEMENT_BOTTOMEND = isRTL ? 'bottom-start' : 'bottom-end'
const PLACEMENT_RIGHT = isRTL ? 'left-start' : 'right-start'
const PLACEMENT_LEFT = isRTL ? 'right-start' : 'left-start'
const Default = {
offset: 0,
flip: true,
boundary: 'clippingParents',
reference: 'toggle',
display: 'dynamic',
popperConfig: null
}
const DefaultType = {
offset: '(number|string|function)',
flip: 'boolean',
boundary: '(string|element)',
reference: '(string|element)',
display: 'string',
popperConfig: '(null|object)'
}
/**
* ------------------------------------------------------------------------
* Class Definition
* ------------------------------------------------------------------------
*/
class Dropdown extends BaseComponent {
constructor(element, config) {
super(element)
this._popper = null
this._config = this._getConfig(config)
this._menu = this._getMenuElement()
this._inNavbar = this._detectNavbar()
this._addEventListeners()
}
// Getters
static get Default() {
return Default
}
static get DefaultType() {
return DefaultType
}
static get DATA_KEY() {
return DATA_KEY
}
// Public
toggle() {
if (this._element.disabled || this._element.classList.contains(CLASS_NAME_DISABLED)) {
return
}
const isActive = this._element.classList.contains(CLASS_NAME_SHOW)
Dropdown.clearMenus()
if (isActive) {
return
}
this.show()
}
show() {
if (this._element.disabled || this._element.classList.contains(CLASS_NAME_DISABLED) || this._menu.classList.contains(CLASS_NAME_SHOW)) {
return
}
const parent = Dropdown.getParentFromElement(this._element)
const relatedTarget = {
relatedTarget: this._element
}
const showEvent = EventHandler.trigger(this._element, EVENT_SHOW, relatedTarget)
if (showEvent.defaultPrevented) {
return
}
// Totally disable Popper for Dropdowns in Navbar
if (!this._inNavbar) {
if (typeof Popper === 'undefined') {
throw new TypeError('Bootstrap\'s dropdowns require Popper (https://popper.js.org)')
}
let referenceElement = this._element
if (this._config.reference === 'parent') {
referenceElement = parent
} else if (isElement(this._config.reference)) {
referenceElement = this._config.reference
// Check if it's jQuery element
if (typeof this._config.reference.jquery !== 'undefined') {
referenceElement = this._config.reference[0]
}
}
this._popper = Popper.createPopper(referenceElement, 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)) {
[].concat(...document.body.children)
.forEach(elem => EventHandler.on(elem, 'mouseover', null, noop()))
}
this._element.focus()
this._element.setAttribute('aria-expanded', true)
this._menu.classList.toggle(CLASS_NAME_SHOW)
this._element.classList.toggle(CLASS_NAME_SHOW)
EventHandler.trigger(parent, EVENT_SHOWN, relatedTarget)
}
hide() {
if (this._element.disabled || this._element.classList.contains(CLASS_NAME_DISABLED) || !this._menu.classList.contains(CLASS_NAME_SHOW)) {
return
}
const parent = Dropdown.getParentFromElement(this._element)
const relatedTarget = {
relatedTarget: this._element
}
const hideEvent = EventHandler.trigger(parent, EVENT_HIDE, relatedTarget)
if (hideEvent.defaultPrevented) {
return
}
if (this._popper) {
this._popper.destroy()
}
this._menu.classList.toggle(CLASS_NAME_SHOW)
this._element.classList.toggle(CLASS_NAME_SHOW)
EventHandler.trigger(parent, EVENT_HIDDEN, relatedTarget)
}
dispose() {
super.dispose()
EventHandler.off(this._element, EVENT_KEY)
this._menu = null
if (this._popper) {
this._popper.destroy()
this._popper = null
}
}
update() {
this._inNavbar = this._detectNavbar()
if (this._popper) {
this._popper.update()
}
}
// Private
_addEventListeners() {
EventHandler.on(this._element, EVENT_CLICK, event => {
event.preventDefault()
event.stopPropagation()
this.toggle()
})
}
_getConfig(config) {
config = {
...this.constructor.Default,
...Manipulator.getDataAttributes(this._element),
...config
}
typeCheckConfig(NAME, config, this.constructor.DefaultType)
return config
}
_getMenuElement() {
return SelectorEngine.next(this._element, SELECTOR_MENU)[0]
}
_getPlacement() {
const parentDropdown = this._element.parentNode
let placement = PLACEMENT_BOTTOM
// Handle dropup
if (parentDropdown.classList.contains(CLASS_NAME_DROPUP)) {
placement = this._menu.classList.contains(CLASS_NAME_MENUEND) ?
PLACEMENT_TOPEND :
PLACEMENT_TOP
} else if (parentDropdown.classList.contains(CLASS_NAME_DROPEND)) {
placement = PLACEMENT_RIGHT
} else if (parentDropdown.classList.contains(CLASS_NAME_DROPSTART)) {
placement = PLACEMENT_LEFT
} else if (this._menu.classList.contains(CLASS_NAME_MENUEND)) {
placement = PLACEMENT_BOTTOMEND
}
return placement
}
_detectNavbar() {
return Boolean(this._element.closest(`.${CLASS_NAME_NAVBAR}`))
}
_getPopperConfig() {
const popperConfig = {
placement: this._getPlacement(),
modifiers: [{
name: 'preventOverflow',
options: {
altBoundary: this._config.flip,
rootBoundary: this._config.boundary
}
}]
}
// Disable Popper if we have a static display
if (this._config.display === 'static') {
popperConfig.modifiers = [{
name: 'applyStyles',
enabled: false
}]
}
return {
...popperConfig,
...this._config.popperConfig
}
}
// Static
static dropdownInterface(element, config) {
let data = Data.getData(element, DATA_KEY)
const _config = typeof config === 'object' ? config : null
if (!data) {
data = new Dropdown(element, _config)
}
if (typeof config === 'string') {
if (typeof data[config] === 'undefined') {
throw new TypeError(`No method named "${config}"`)
}
data[config]()
}
}
static jQueryInterface(config) {
return this.each(function () {
Dropdown.dropdownInterface(this, config)
})
}
static clearMenus(event) {
if (event && (event.button === RIGHT_MOUSE_BUTTON || (event.type === 'keyup' && event.key !== TAB_KEY))) {
return
}
const toggles = SelectorEngine.find(SELECTOR_DATA_TOGGLE)
for (let i = 0, len = toggles.length; i < len; i++) {
const parent = Dropdown.getParentFromElement(toggles[i])
const context = Data.getData(toggles[i], DATA_KEY)
const relatedTarget = {
relatedTarget: toggles[i]
}
if (event && event.type === 'click') {
relatedTarget.clickEvent = event
}
if (!context) {
continue
}
const dropdownMenu = context._menu
if (!toggles[i].classList.contains(CLASS_NAME_SHOW)) {
continue
}
if (event && ((event.type === 'click' &&
/input|textarea/i.test(event.target.tagName)) ||
(event.type === 'keyup' && event.key === TAB_KEY)) &&
dropdownMenu.contains(event.target)) {
continue
}
const hideEvent = EventHandler.trigger(parent, EVENT_HIDE, relatedTarget)
if (hideEvent.defaultPrevented) {
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) {
[].concat(...document.body.children)
.forEach(elem => EventHandler.off(elem, 'mouseover', null, noop()))
}
toggles[i].setAttribute('aria-expanded', 'false')
if (context._popper) {
context._popper.destroy()
}
dropdownMenu.classList.remove(CLASS_NAME_SHOW)
toggles[i].classList.remove(CLASS_NAME_SHOW)
EventHandler.trigger(parent, EVENT_HIDDEN, relatedTarget)
}
}
static getParentFromElement(element) {
return getElementFromSelector(element) || element.parentNode
}
static dataApiKeydownHandler(event) {
// If not input/textarea:
// - And not a key in REGEXP_KEYDOWN => not a dropdown command
// If input/textarea:
// - If space key => not a dropdown command
// - If key is other than escape
// - If key is not up or down => not a dropdown command
// - If trigger inside the menu => not a dropdown command
if (/input|textarea/i.test(event.target.tagName) ?
event.key === SPACE_KEY || (event.key !== ESCAPE_KEY &&
((event.key !== ARROW_DOWN_KEY && event.key !== ARROW_UP_KEY) ||
event.target.closest(SELECTOR_MENU))) :
!REGEXP_KEYDOWN.test(event.key)) {
return
}
event.preventDefault()
event.stopPropagation()
if (this.disabled || this.classList.contains(CLASS_NAME_DISABLED)) {
return
}
const parent = Dropdown.getParentFromElement(this)
const isActive = this.classList.contains(CLASS_NAME_SHOW)
if (event.key === ESCAPE_KEY) {
const button = this.matches(SELECTOR_DATA_TOGGLE) ? this : SelectorEngine.prev(this, SELECTOR_DATA_TOGGLE)[0]
button.focus()
Dropdown.clearMenus()
return
}
if (!isActive || event.key === SPACE_KEY) {
Dropdown.clearMenus()
return
}
const items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, parent).filter(isVisible)
if (!items.length) {
return
}
let index = items.indexOf(event.target)
// Up
if (event.key === ARROW_UP_KEY && index > 0) {
index--
}
// Down
if (event.key === ARROW_DOWN_KEY && index < items.length - 1) {
index++
}
// index is -1 if the first keydown is an ArrowUp
index = index === -1 ? 0 : index
items[index].focus()
}
}
/**
* ------------------------------------------------------------------------
* Data Api implementation
* ------------------------------------------------------------------------
*/
EventHandler.on(document, EVENT_KEYDOWN_DATA_API, SELECTOR_DATA_TOGGLE, Dropdown.dataApiKeydownHandler)
EventHandler.on(document, EVENT_KEYDOWN_DATA_API, SELECTOR_MENU, Dropdown.dataApiKeydownHandler)
EventHandler.on(document, EVENT_CLICK_DATA_API, Dropdown.clearMenus)
EventHandler.on(document, EVENT_KEYUP_DATA_API, Dropdown.clearMenus)
EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {
event.preventDefault()
event.stopPropagation()
Dropdown.dropdownInterface(this, 'toggle')
})
EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_FORM_CHILD, e => e.stopPropagation())
/**
* ------------------------------------------------------------------------
* jQuery
* ------------------------------------------------------------------------
* add .Dropdown to jQuery only if jQuery is present
*/
onDOMContentLoaded(() => {
const $ = getjQuery()
/* istanbul ignore if */
if ($) {
const JQUERY_NO_CONFLICT = $.fn[NAME]
$.fn[NAME] = Dropdown.jQueryInterface
$.fn[NAME].Constructor = Dropdown
$.fn[NAME].noConflict = () => {
$.fn[NAME] = JQUERY_NO_CONFLICT
return Dropdown.jQueryInterface
}
}
})
export default Dropdown
|