# All files / src dropdown.js

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93.55% Functions 29/31
96.89% Lines 218/225

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     /**
     * --------------------------------------------------------------------------
     * CoreUI (v3.3.0): dropdown.js
     * Licensed under MIT (https://coreui.io/license)
     *
     * This component is a modified version of the Bootstrap's dropdown.js
     * Bootstrap (v5.0.0): dropdown.js
     * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
     * --------------------------------------------------------------------------
     */

    import {
      getjQuery,
      getElementFromSelector,
      isElement,
      isVisible,
      noop,
      typeCheckConfig
    } from './util/index'
    import Data from './dom/data'
    import EventHandler from './dom/event-handler'
    import Manipulator from './dom/manipulator'
    import { createPopper } from '@popperjs/core'
    import SelectorEngine from './dom/selector-engine'

    /**
     * ------------------------------------------------------------------------
     * Constants
     * ------------------------------------------------------------------------
     */

    const NAME = 'dropdown'
    const VERSION = '3.2.2'
    const DATA_KEY = 'coreui.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_DROPRIGHT = 'dropright'
    const CLASS_NAME_DROPLEFT = 'dropleft'
    const CLASS_NAME_HEADER = 'c-header'
    const CLASS_NAME_MENURIGHT = 'dropdown-menu-right'
    const CLASS_NAME_NAVBAR = 'navbar'
    const CLASS_NAME_POSITION_STATIC = 'position-static'

    const SELECTOR_DATA_TOGGLE = '[data-toggle="dropdown"]'
    const SELECTOR_FORM_CHILD = '.dropdown form'
    const SELECTOR_HEADER_NAV = '.c-header-nav'
    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 = 'top-start'
    const PLACEMENT_TOPEND = 'top-end'
    const PLACEMENT_BOTTOM = 'bottom-start'
    const PLACEMENT_BOTTOMEND = 'bottom-end'
    const PLACEMENT_RIGHT = 'right-start'
    const PLACEMENT_LEFT = 'left-start'

    const Default = {
      offset: [0, 0],
      flip: true,
      boundary: 'scrollParent',
      reference: 'toggle',
      display: 'dynamic',
      popperConfig: null
    }

    const DefaultType = {
      offset: '(array|function)',
      flip: 'boolean',
      boundary: '(string|element)',
      reference: '(string|element)',
      display: 'string',
      popperConfig: '(null|object)'
    }

    /**
     * ------------------------------------------------------------------------
     * 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._inHeader = this._detectHeader()

        this._addEventListeners()
        Data.setData(element, DATA_KEY, this)
      }

      // Getters

      static get VERSION() {
        return VERSION
      }

      static get Default() {
        return Default
      }

      static get DefaultType() {
        return DefaultType
      }

      // Public

      toggle() {
        if (this._element.disabled || this._element.classList.contains(CLASS_NAME_DISABLED)) {
          return
        }

        const isActive = this._menu.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(parent, EVENT_SHOW, relatedTarget)

        if (showEvent.defaultPrevented) {
          return
        }

        // Disable totally Popper.js for Dropdown in Navbar
        if (!this._inNavbar && !this._inHeader) {
          Iif (typeof createPopper === 'undefined') {
            throw new TypeError('CoreUI\'s dropdowns require Popper.js (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]
            }
          }

          // If boundary is not `scrollParent`, then set position to `static`
          // to allow the menu to "escape" the scroll parent's boundaries
          // https://github.com/twbs/bootstrap/issues/24251
          if (this._config.boundary !== 'scrollParent') {
            parent.classList.add(CLASS_NAME_POSITION_STATIC)
          }

          this._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()))
        }

        if ('ontouchstart' in document.documentElement &&
          !parent.closest(SELECTOR_HEADER_NAV)) {
          [].concat(...document.body.children)
            .forEach(elem => EventHandler.on(elem, 'mouseover', null, noop()))
        }

        this._element.focus()
        this._element.setAttribute('aria-expanded', true)

        Manipulator.toggleClass(this._menu, CLASS_NAME_SHOW)
        Manipulator.toggleClass(parent, 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()
        }

        Manipulator.toggleClass(this._menu, CLASS_NAME_SHOW)
        Manipulator.toggleClass(parent, CLASS_NAME_SHOW)
        EventHandler.trigger(parent, EVENT_HIDDEN, relatedTarget)
      }

      dispose() {
        Data.removeData(this._element, DATA_KEY)
        EventHandler.off(this._element, EVENT_KEY)
        this._element = null
        this._menu = null
        if (this._popper) {
          this._popper.destroy()
          this._popper = null
        }
      }

      update() {
        this._inNavbar = this._detectNavbar()
        this._inHeader = this._detectHeader()
        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() {
        const parent = Dropdown.getParentFromElement(this._element)

        return SelectorEngine.findOne(SELECTOR_MENU, parent)
      }

      _getPlacement() {
        const parentDropdown = this._element.parentNode
        let placement = PLACEMENT_BOTTOM

        // Handle dropup
        if (parentDropdown.classList.contains(CLASS_NAME_DROPUP)) {
          placement = PLACEMENT_TOP
          if (this._menu.classList.contains(CLASS_NAME_MENURIGHT)) {
            placement = PLACEMENT_TOPEND
          }
        } else if (parentDropdown.classList.contains(CLASS_NAME_DROPRIGHT)) {
          placement = PLACEMENT_RIGHT
        } else if (parentDropdown.classList.contains(CLASS_NAME_DROPLEFT)) {
          placement = PLACEMENT_LEFT
        } else if (this._menu.classList.contains(CLASS_NAME_MENURIGHT)) {
          placement = PLACEMENT_BOTTOMEND
        }

        return placement
      }

      _detectNavbar() {
        return Boolean(this._element.closest(`.${CLASS_NAME_NAVBAR}`))
      }

      _detectHeader() {
        return Boolean(this._element.closest(`.${CLASS_NAME_HEADER}`))
      }

      _getOffset() {
        let offset = []

        if (typeof this._config.offset === 'function') {
          offset = ({ placement, reference, popper }) => this._config.offset({ placement, reference, popper })
        } else {
          offset = this._config.offset
        }

        return offset
      }

      _getPopperConfig() {
        const popperConfig = {
          placement: this._getPlacement(),
          modifiers: [
            {
              name: 'offset',
              options: {
                offset: this._getOffset()
              }
            },
            {
              name: 'flip',
              enabled: this._config.flip
            },
            {
              name: 'preventOverflow',
              options: {
                boundary: this._config.boundary
              }
            }
          ]
        }

        // Disable Popper.js 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) {
        Iif (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 (!parent.classList.contains(CLASS_NAME_SHOW)) {
            continue
          }

          Iif (event && ((event.type === 'click' &&
              /input|textarea/i.test(event.target.tagName)) ||
              (event.type === 'keyup' && event.key === TAB_KEY)) &&
              parent.contains(event.target)) {
            continue
          }

          const hideEvent = EventHandler.trigger(parent, EVENT_HIDE, relatedTarget)
          Iif (hideEvent.defaultPrevented) {
            continue
          }

          // If this is a touch-enabled device we remove the extra
          // empty mouseover listeners we added for iOS support
          Eif ('ontouchstart' in document.documentElement) {
            [].concat(...document.body.children)
              .forEach(elem => EventHandler.off(elem, 'mouseover', null, noop()))
          }

          toggles[i].setAttribute('aria-expanded', 'false')

          Eif (context._popper) {
            context._popper.destroy()
          }

          dropdownMenu.classList.remove(CLASS_NAME_SHOW)
          parent.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 = parent.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
        }

        Iif (!isActive || event.key === SPACE_KEY) {
          Dropdown.clearMenus()
          return
        }

        const items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, parent).filter(isVisible)

        Iif (!items.length) {
          return
        }

        let index = items.indexOf(event.target)

        if (event.key === ARROW_UP_KEY && index > 0) { // Up
          index--
        }

        if (event.key === ARROW_DOWN_KEY && index < items.length - 1) { // Down
          index++
        }

        // index is -1 if the first keydown is an ArrowUp
        index = index === -1 ? 0 : index

        items[index].focus()
      }

      static getInstance(element) {
        return Data.getData(element, DATA_KEY)
      }
    }

    /**
     * ------------------------------------------------------------------------
     * 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())

    const $ = getjQuery()

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