Bootstrap/js/src/collapse.js

/**
 * --------------------------------------------------------------------------
 * Bootstrap (v5.0.0-beta1): collapse.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 * --------------------------------------------------------------------------
 */

import {
  getjQuery,
  onDOMContentLoaded,
  TRANSITION_END,
  emulateTransitionEnd,
  getSelectorFromElement,
  getElementFromSelector,
  getTransitionDurationFromElement,
  isElement,
  reflow,
  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 = 'collapse'
const DATA_KEY = 'bs.collapse'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'

const Default = {
  toggle: true,
  parent: ''
}

const DefaultType = {
  toggle: 'boolean',
  parent: '(string|element)'
}

const EVENT_SHOW = `show${EVENT_KEY}`
const EVENT_SHOWN = `shown${EVENT_KEY}`
const EVENT_HIDE = `hide${EVENT_KEY}`
const EVENT_HIDDEN = `hidden${EVENT_KEY}`
const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`

const CLASS_NAME_SHOW = 'show'
const CLASS_NAME_COLLAPSE = 'collapse'
const CLASS_NAME_COLLAPSING = 'collapsing'
const CLASS_NAME_COLLAPSED = 'collapsed'

const WIDTH = 'width'
const HEIGHT = 'height'

const SELECTOR_ACTIVES = '.show, .collapsing'
const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="collapse"]'

/**
 * ------------------------------------------------------------------------
 * Class Definition
 * ------------------------------------------------------------------------
 */

class Collapse extends BaseComponent {
  constructor(element, config) {
    super(element)

    this._isTransitioning = false
    this._config = this._getConfig(config)
    this._triggerArray = SelectorEngine.find(
      `${SELECTOR_DATA_TOGGLE}[href="#${element.id}"],` +
      `${SELECTOR_DATA_TOGGLE}[data-bs-target="#${element.id}"]`
    )

    const toggleList = SelectorEngine.find(SELECTOR_DATA_TOGGLE)

    for (let i = 0, len = toggleList.length; i < len; i++) {
      const elem = toggleList[i]
      const selector = getSelectorFromElement(elem)
      const filterElement = SelectorEngine.find(selector)
        .filter(foundElem => foundElem === element)

      if (selector !== null && filterElement.length) {
        this._selector = selector
        this._triggerArray.push(elem)
      }
    }

    this._parent = this._config.parent ? this._getParent() : null

    if (!this._config.parent) {
      this._addAriaAndCollapsedClass(this._element, this._triggerArray)
    }

    if (this._config.toggle) {
      this.toggle()
    }
  }

  // Getters

  static get Default() {
    return Default
  }

  static get DATA_KEY() {
    return DATA_KEY
  }

  // Public

  toggle() {
    if (this._element.classList.contains(CLASS_NAME_SHOW)) {
      this.hide()
    } else {
      this.show()
    }
  }

  show() {
    if (this._isTransitioning || this._element.classList.contains(CLASS_NAME_SHOW)) {
      return
    }

    let actives
    let activesData

    if (this._parent) {
      actives = SelectorEngine.find(SELECTOR_ACTIVES, this._parent)
        .filter(elem => {
          if (typeof this._config.parent === 'string') {
            return elem.getAttribute('data-bs-parent') === this._config.parent
          }

          return elem.classList.contains(CLASS_NAME_COLLAPSE)
        })

      if (actives.length === 0) {
        actives = null
      }
    }

    const container = SelectorEngine.findOne(this._selector)
    if (actives) {
      const tempActiveData = actives.find(elem => container !== elem)
      activesData = tempActiveData ? Data.getData(tempActiveData, DATA_KEY) : null

      if (activesData && activesData._isTransitioning) {
        return
      }
    }

    const startEvent = EventHandler.trigger(this._element, EVENT_SHOW)
    if (startEvent.defaultPrevented) {
      return
    }

    if (actives) {
      actives.forEach(elemActive => {
        if (container !== elemActive) {
          Collapse.collapseInterface(elemActive, 'hide')
        }

        if (!activesData) {
          Data.setData(elemActive, DATA_KEY, null)
        }
      })
    }

    const dimension = this._getDimension()

    this._element.classList.remove(CLASS_NAME_COLLAPSE)
    this._element.classList.add(CLASS_NAME_COLLAPSING)

    this._element.style[dimension] = 0

    if (this._triggerArray.length) {
      this._triggerArray.forEach(element => {
        element.classList.remove(CLASS_NAME_COLLAPSED)
        element.setAttribute('aria-expanded', true)
      })
    }

    this.setTransitioning(true)

    const complete = () => {
      this._element.classList.remove(CLASS_NAME_COLLAPSING)
      this._element.classList.add(CLASS_NAME_COLLAPSE, CLASS_NAME_SHOW)

      this._element.style[dimension] = ''

      this.setTransitioning(false)

      EventHandler.trigger(this._element, EVENT_SHOWN)
    }

    const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1)
    const scrollSize = `scroll${capitalizedDimension}`
    const transitionDuration = getTransitionDurationFromElement(this._element)

    EventHandler.one(this._element, TRANSITION_END, complete)

    emulateTransitionEnd(this._element, transitionDuration)
    this._element.style[dimension] = `${this._element[scrollSize]}px`
  }

  hide() {
    if (this._isTransitioning || !this._element.classList.contains(CLASS_NAME_SHOW)) {
      return
    }

    const startEvent = EventHandler.trigger(this._element, EVENT_HIDE)
    if (startEvent.defaultPrevented) {
      return
    }

    const dimension = this._getDimension()

    this._element.style[dimension] = `${this._element.getBoundingClientRect()[dimension]}px`

    reflow(this._element)

    this._element.classList.add(CLASS_NAME_COLLAPSING)
    this._element.classList.remove(CLASS_NAME_COLLAPSE, CLASS_NAME_SHOW)

    const triggerArrayLength = this._triggerArray.length
    if (triggerArrayLength > 0) {
      for (let i = 0; i < triggerArrayLength; i++) {
        const trigger = this._triggerArray[i]
        const elem = getElementFromSelector(trigger)

        if (elem && !elem.classList.contains(CLASS_NAME_SHOW)) {
          trigger.classList.add(CLASS_NAME_COLLAPSED)
          trigger.setAttribute('aria-expanded', false)
        }
      }
    }

    this.setTransitioning(true)

    const complete = () => {
      this.setTransitioning(false)
      this._element.classList.remove(CLASS_NAME_COLLAPSING)
      this._element.classList.add(CLASS_NAME_COLLAPSE)
      EventHandler.trigger(this._element, EVENT_HIDDEN)
    }

    this._element.style[dimension] = ''
    const transitionDuration = getTransitionDurationFromElement(this._element)

    EventHandler.one(this._element, TRANSITION_END, complete)
    emulateTransitionEnd(this._element, transitionDuration)
  }

  setTransitioning(isTransitioning) {
    this._isTransitioning = isTransitioning
  }

  dispose() {
    super.dispose()
    this._config = null
    this._parent = null
    this._triggerArray = null
    this._isTransitioning = null
  }

  // Private

  _getConfig(config) {
    config = {
      ...Default,
      ...config
    }
    config.toggle = Boolean(config.toggle) // Coerce string values
    typeCheckConfig(NAME, config, DefaultType)
    return config
  }

  _getDimension() {
    return this._element.classList.contains(WIDTH) ? WIDTH : HEIGHT
  }

  _getParent() {
    let { parent } = this._config

    if (isElement(parent)) {
      // it's a jQuery object
      if (typeof parent.jquery !== 'undefined' || typeof parent[0] !== 'undefined') {
        parent = parent[0]
      }
    } else {
      parent = SelectorEngine.findOne(parent)
    }

    const selector = `${SELECTOR_DATA_TOGGLE}[data-bs-parent="${parent}"]`

    SelectorEngine.find(selector, parent)
      .forEach(element => {
        const selected = getElementFromSelector(element)

        this._addAriaAndCollapsedClass(
          selected,
          [element]
        )
      })

    return parent
  }

  _addAriaAndCollapsedClass(element, triggerArray) {
    if (!element || !triggerArray.length) {
      return
    }

    const isOpen = element.classList.contains(CLASS_NAME_SHOW)

    triggerArray.forEach(elem => {
      if (isOpen) {
        elem.classList.remove(CLASS_NAME_COLLAPSED)
      } else {
        elem.classList.add(CLASS_NAME_COLLAPSED)
      }

      elem.setAttribute('aria-expanded', isOpen)
    })
  }

  // Static

  static collapseInterface(element, config) {
    let data = Data.getData(element, DATA_KEY)
    const _config = {
      ...Default,
      ...Manipulator.getDataAttributes(element),
      ...(typeof config === 'object' && config ? config : {})
    }

    if (!data && _config.toggle && typeof config === 'string' && /show|hide/.test(config)) {
      _config.toggle = false
    }

    if (!data) {
      data = new Collapse(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 () {
      Collapse.collapseInterface(this, config)
    })
  }
}

/**
 * ------------------------------------------------------------------------
 * Data Api implementation
 * ------------------------------------------------------------------------
 */

EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {
  // preventDefault only for <a> elements (which change the URL) not inside the collapsible element
  if (event.target.tagName === 'A') {
    event.preventDefault()
  }

  const triggerData = Manipulator.getDataAttributes(this)
  const selector = getSelectorFromElement(this)
  const selectorElements = SelectorEngine.find(selector)

  selectorElements.forEach(element => {
    const data = Data.getData(element, DATA_KEY)
    let config
    if (data) {
      // update parent attribute
      if (data._parent === null && typeof triggerData.parent === 'string') {
        data._config.parent = triggerData.parent
        data._parent = data._getParent()
      }

      config = 'toggle'
    } else {
      config = triggerData
    }

    Collapse.collapseInterface(element, config)
  })
})

/**
 * ------------------------------------------------------------------------
 * jQuery
 * ------------------------------------------------------------------------
 * add .Collapse to jQuery only if jQuery is present
 */

onDOMContentLoaded(() => {
  const $ = getjQuery()
  /* istanbul ignore if */
  if ($) {
    const JQUERY_NO_CONFLICT = $.fn[NAME]
    $.fn[NAME] = Collapse.jQueryInterface
    $.fn[NAME].Constructor = Collapse
    $.fn[NAME].noConflict = () => {
      $.fn[NAME] = JQUERY_NO_CONFLICT
      return Collapse.jQueryInterface
    }
  }
})

export default Collapse