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tab.js
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Tue, Feb 4, 05:24

tab.js
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/**
* --------------------------------------------------------------------------
* Bootstrap (v5.2.3): tab.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
* --------------------------------------------------------------------------
*/
import { defineJQueryPlugin, getElementFromSelector, getNextActiveElement, isDisabled } from './util/index'
import EventHandler from './dom/event-handler'
import SelectorEngine from './dom/selector-engine'
import BaseComponent from './base-component'
/**
* Constants
*/
const NAME = 'tab'
const DATA_KEY = 'bs.tab'
const EVENT_KEY = `.${DATA_KEY}`
const EVENT_HIDE = `hide${EVENT_KEY}`
const EVENT_HIDDEN = `hidden${EVENT_KEY}`
const EVENT_SHOW = `show${EVENT_KEY}`
const EVENT_SHOWN = `shown${EVENT_KEY}`
const EVENT_CLICK_DATA_API = `click${EVENT_KEY}`
const EVENT_KEYDOWN = `keydown${EVENT_KEY}`
const EVENT_LOAD_DATA_API = `load${EVENT_KEY}`
const ARROW_LEFT_KEY = 'ArrowLeft'
const ARROW_RIGHT_KEY = 'ArrowRight'
const ARROW_UP_KEY = 'ArrowUp'
const ARROW_DOWN_KEY = 'ArrowDown'
const CLASS_NAME_ACTIVE = 'active'
const CLASS_NAME_FADE = 'fade'
const CLASS_NAME_SHOW = 'show'
const CLASS_DROPDOWN = 'dropdown'
const SELECTOR_DROPDOWN_TOGGLE = '.dropdown-toggle'
const SELECTOR_DROPDOWN_MENU = '.dropdown-menu'
const NOT_SELECTOR_DROPDOWN_TOGGLE = ':not(.dropdown-toggle)'
const SELECTOR_TAB_PANEL = '.list-group, .nav, [role="tablist"]'
const SELECTOR_OUTER = '.nav-item, .list-group-item'
const SELECTOR_INNER = `.nav-link${NOT_SELECTOR_DROPDOWN_TOGGLE}, .list-group-item${NOT_SELECTOR_DROPDOWN_TOGGLE}, [role="tab"]${NOT_SELECTOR_DROPDOWN_TOGGLE}`
const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="tab"], [data-bs-toggle="pill"], [data-bs-toggle="list"]' // todo:v6: could be only `tab`
const SELECTOR_INNER_ELEM = `${SELECTOR_INNER}, ${SELECTOR_DATA_TOGGLE}`
const SELECTOR_DATA_TOGGLE_ACTIVE = `.${CLASS_NAME_ACTIVE}[data-bs-toggle="tab"], .${CLASS_NAME_ACTIVE}[data-bs-toggle="pill"], .${CLASS_NAME_ACTIVE}[data-bs-toggle="list"]`
/**
* Class definition
*/
class Tab extends BaseComponent {
constructor(element) {
super(element)
this._parent = this._element.closest(SELECTOR_TAB_PANEL)
if (!this._parent) {
return
// todo: should Throw exception on v6
// throw new TypeError(`${element.outerHTML} has not a valid parent ${SELECTOR_INNER_ELEM}`)
}
// Set up initial aria attributes
this._setInitialAttributes(this._parent, this._getChildren())
EventHandler.on(this._element, EVENT_KEYDOWN, event => this._keydown(event))
}
// Getters
static get NAME() {
return NAME
}
// Public
show() { // Shows this elem and deactivate the active sibling if exists
const innerElem = this._element
if (this._elemIsActive(innerElem)) {
return
}
// Search for active tab on same parent to deactivate it
const active = this._getActiveElem()
const hideEvent = active ?
EventHandler.trigger(active, EVENT_HIDE, { relatedTarget: innerElem }) :
null
const showEvent = EventHandler.trigger(innerElem, EVENT_SHOW, { relatedTarget: active })
if (showEvent.defaultPrevented || (hideEvent && hideEvent.defaultPrevented)) {
return
}
this._deactivate(active, innerElem)
this._activate(innerElem, active)
}
// Private
_activate(element, relatedElem) {
if (!element) {
return
}
element.classList.add(CLASS_NAME_ACTIVE)
this._activate(getElementFromSelector(element)) // Search and activate/show the proper section
const complete = () => {
if (element.getAttribute('role') !== 'tab') {
element.classList.add(CLASS_NAME_SHOW)
return
}
element.removeAttribute('tabindex')
element.setAttribute('aria-selected', true)
this._toggleDropDown(element, true)
EventHandler.trigger(element, EVENT_SHOWN, {
relatedTarget: relatedElem
})
}
this._queueCallback(complete, element, element.classList.contains(CLASS_NAME_FADE))
}
_deactivate(element, relatedElem) {
if (!element) {
return
}
element.classList.remove(CLASS_NAME_ACTIVE)
element.blur()
this._deactivate(getElementFromSelector(element)) // Search and deactivate the shown section too
const complete = () => {
if (element.getAttribute('role') !== 'tab') {
element.classList.remove(CLASS_NAME_SHOW)
return
}
element.setAttribute('aria-selected', false)
element.setAttribute('tabindex', '-1')
this._toggleDropDown(element, false)
EventHandler.trigger(element, EVENT_HIDDEN, { relatedTarget: relatedElem })
}
this._queueCallback(complete, element, element.classList.contains(CLASS_NAME_FADE))
}
_keydown(event) {
if (!([ARROW_LEFT_KEY, ARROW_RIGHT_KEY, ARROW_UP_KEY, ARROW_DOWN_KEY].includes(event.key))) {
return
}
event.stopPropagation()// stopPropagation/preventDefault both added to support up/down keys without scrolling the page
event.preventDefault()
const isNext = [ARROW_RIGHT_KEY, ARROW_DOWN_KEY].includes(event.key)
const nextActiveElement = getNextActiveElement(this._getChildren().filter(element => !isDisabled(element)), event.target, isNext, true)
if (nextActiveElement) {
nextActiveElement.focus({ preventScroll: true })
Tab.getOrCreateInstance(nextActiveElement).show()
}
}
_getChildren() { // collection of inner elements
return SelectorEngine.find(SELECTOR_INNER_ELEM, this._parent)
}
_getActiveElem() {
return this._getChildren().find(child => this._elemIsActive(child)) || null
}
_setInitialAttributes(parent, children) {
this._setAttributeIfNotExists(parent, 'role', 'tablist')
for (const child of children) {
this._setInitialAttributesOnChild(child)
}
}
_setInitialAttributesOnChild(child) {
child = this._getInnerElement(child)
const isActive = this._elemIsActive(child)
const outerElem = this._getOuterElement(child)
child.setAttribute('aria-selected', isActive)
if (outerElem !== child) {
this._setAttributeIfNotExists(outerElem, 'role', 'presentation')
}
if (!isActive) {
child.setAttribute('tabindex', '-1')
}
this._setAttributeIfNotExists(child, 'role', 'tab')
// set attributes to the related panel too
this._setInitialAttributesOnTargetPanel(child)
}
_setInitialAttributesOnTargetPanel(child) {
const target = getElementFromSelector(child)
if (!target) {
return
}
this._setAttributeIfNotExists(target, 'role', 'tabpanel')
if (child.id) {
this._setAttributeIfNotExists(target, 'aria-labelledby', `#${child.id}`)
}
}
_toggleDropDown(element, open) {
const outerElem = this._getOuterElement(element)
if (!outerElem.classList.contains(CLASS_DROPDOWN)) {
return
}
const toggle = (selector, className) => {
const element = SelectorEngine.findOne(selector, outerElem)
if (element) {
element.classList.toggle(className, open)
}
}
toggle(SELECTOR_DROPDOWN_TOGGLE, CLASS_NAME_ACTIVE)
toggle(SELECTOR_DROPDOWN_MENU, CLASS_NAME_SHOW)
outerElem.setAttribute('aria-expanded', open)
}
_setAttributeIfNotExists(element, attribute, value) {
if (!element.hasAttribute(attribute)) {
element.setAttribute(attribute, value)
}
}
_elemIsActive(elem) {
return elem.classList.contains(CLASS_NAME_ACTIVE)
}
// Try to get the inner element (usually the .nav-link)
_getInnerElement(elem) {
return elem.matches(SELECTOR_INNER_ELEM) ? elem : SelectorEngine.findOne(SELECTOR_INNER_ELEM, elem)
}
// Try to get the outer element (usually the .nav-item)
_getOuterElement(elem) {
return elem.closest(SELECTOR_OUTER) || elem
}
// Static
static jQueryInterface(config) {
return this.each(function () {
const data = Tab.getOrCreateInstance(this)
if (typeof config !== 'string') {
return
}
if (data[config] === undefined || config.startsWith('_') || config === 'constructor') {
throw new TypeError(`No method named "${config}"`)
}
data[config]()
})
}
}
/**
* Data API implementation
*/
EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {
if (['A', 'AREA'].includes(this.tagName)) {
event.preventDefault()
}
if (isDisabled(this)) {
return
}
Tab.getOrCreateInstance(this).show()
})
/**
* Initialize on focus
*/
EventHandler.on(window, EVENT_LOAD_DATA_API, () => {
for (const element of SelectorEngine.find(SELECTOR_DATA_TOGGLE_ACTIVE)) {
Tab.getOrCreateInstance(element)
}
})
/**
* jQuery
*/
defineJQueryPlugin(Tab)
export default Tab

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