upgrade to bootstrap 5.0.1 and first batch of fixes

1 files changed, 262 insertions, 269 deletions

diff --git a/vendor/twbs/bootstrap/js/src/dropdown.js b/vendor/twbs/bootstrap/js/src/dropdown.js
index 76dda8f57..565edb892 100644
--- a/vendor/twbs/bootstrap/js/src/dropdown.js
+++ b/vendor/twbs/bootstrap/js/src/dropdown.js
@@ -1,13 +1,28 @@
 /**
  * --------------------------------------------------------------------------
- * Bootstrap (v4.6.0): dropdown.js
+ * Bootstrap (v5.0.1): dropdown.js
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  * --------------------------------------------------------------------------
  */
 
-import $ from 'jquery'
-import Popper from 'popper.js'
-import Util from './util'
+import * as Popper from '@popperjs/core'
+
+import {
+  defineJQueryPlugin,
+  getElement,
+  getElementFromSelector,
+  isDisabled,
+  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'
 
 /**
  * ------------------------------------------------------------------------
@@ -16,18 +31,18 @@ import Util from './util'
  */
 
 const NAME = 'dropdown'
-const VERSION = '4.6.0'
 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 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}`
@@ -38,43 +53,40 @@ 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_MENURIGHT = 'dropdown-menu-right'
-const CLASS_NAME_POSITION_STATIC = 'position-static'
+const CLASS_NAME_DROPEND = 'dropend'
+const CLASS_NAME_DROPSTART = 'dropstart'
+const CLASS_NAME_NAVBAR = 'navbar'
 
-const SELECTOR_DATA_TOGGLE = '[data-toggle="dropdown"]'
-const SELECTOR_FORM_CHILD = '.dropdown form'
+const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="dropdown"]'
 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 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: 'scrollParent',
+  offset: [0, 2],
+  boundary: 'clippingParents',
   reference: 'toggle',
   display: 'dynamic',
-  popperConfig: null
+  popperConfig: null,
+  autoClose: true
 }
 
 const DefaultType = {
-  offset: '(number|string|function)',
-  flip: 'boolean',
+  offset: '(array|string|function)',
   boundary: '(string|element)',
-  reference: '(string|element)',
+  reference: '(string|element|object)',
   display: 'string',
-  popperConfig: '(null|object)'
+  popperConfig: '(null|object|function)',
+  autoClose: '(boolean|string)'
 }
 
 /**
@@ -83,9 +95,10 @@ const DefaultType = {
  * ------------------------------------------------------------------------
  */
 
-class Dropdown {
+class Dropdown extends BaseComponent {
   constructor(element, config) {
-    this._element = element
+    super(element)
+
     this._popper = null
     this._config = this._getConfig(config)
     this._menu = this._getMenuElement()
@@ -96,10 +109,6 @@ class Dropdown {
 
   // Getters
 
-  static get VERSION() {
-    return VERSION
-  }
-
   static get Default() {
     return Default
   }
@@ -108,47 +117,47 @@ class Dropdown {
     return DefaultType
   }
 
+  static get NAME() {
+    return NAME
+  }
+
   // Public
 
   toggle() {
-    if (this._element.disabled || $(this._element).hasClass(CLASS_NAME_DISABLED)) {
+    if (isDisabled(this._element)) {
       return
     }
 
-    const isActive = $(this._menu).hasClass(CLASS_NAME_SHOW)
-
-    Dropdown._clearMenus()
+    const isActive = this._element.classList.contains(CLASS_NAME_SHOW)
 
     if (isActive) {
+      this.hide()
       return
     }
 
-    this.show(true)
+    this.show()
   }
 
-  show(usePopper = false) {
-    if (this._element.disabled || $(this._element).hasClass(CLASS_NAME_DISABLED) || $(this._menu).hasClass(CLASS_NAME_SHOW)) {
+  show() {
+    if (isDisabled(this._element) || this._menu.classList.contains(CLASS_NAME_SHOW)) {
       return
     }
 
+    const parent = Dropdown.getParentFromElement(this._element)
     const relatedTarget = {
       relatedTarget: this._element
     }
-    const showEvent = $.Event(EVENT_SHOW, relatedTarget)
-    const parent = Dropdown._getParentFromElement(this._element)
 
-    $(parent).trigger(showEvent)
+    const showEvent = EventHandler.trigger(this._element, EVENT_SHOW, relatedTarget)
 
-    if (showEvent.isDefaultPrevented()) {
+    if (showEvent.defaultPrevented) {
       return
     }
 
     // Totally disable Popper for Dropdowns in Navbar
-    if (!this._inNavbar && usePopper) {
-      /**
-       * Check for Popper dependency
-       * Popper - https://popper.js.org
-       */
+    if (this._inNavbar) {
+      Manipulator.setDataAttribute(this._menu, 'popper', 'none')
+    } else {
       if (typeof Popper === 'undefined') {
         throw new TypeError('Bootstrap\'s dropdowns require Popper (https://popper.js.org)')
       }
@@ -157,23 +166,20 @@ class Dropdown {
 
       if (this._config.reference === 'parent') {
         referenceElement = parent
-      } else if (Util.isElement(this._config.reference)) {
+      } else if (isElement(this._config.reference)) {
+        referenceElement = getElement(this._config.reference)
+      } else if (typeof this._config.reference === 'object') {
         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).addClass(CLASS_NAME_POSITION_STATIC)
-      }
+      const popperConfig = this._getPopperConfig()
+      const isDisplayStatic = popperConfig.modifiers.find(modifier => modifier.name === 'applyStyles' && modifier.enabled === false)
 
-      this._popper = new Popper(referenceElement, this._menu, this._getPopperConfig())
+      this._popper = Popper.createPopper(referenceElement, this._menu, popperConfig)
+
+      if (isDisplayStatic) {
+        Manipulator.setDataAttribute(this._menu, 'popper', 'static')
+      }
     }
 
     // If this is a touch-enabled device we add extra
@@ -181,266 +187,273 @@ class Dropdown {
     // 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 === 0) {
-      $(document.body).children().on('mouseover', null, $.noop)
+      !parent.closest(SELECTOR_NAVBAR_NAV)) {
+      [].concat(...document.body.children)
+        .forEach(elem => EventHandler.on(elem, 'mouseover', noop))
     }
 
     this._element.focus()
     this._element.setAttribute('aria-expanded', true)
 
-    $(this._menu).toggleClass(CLASS_NAME_SHOW)
-    $(parent)
-      .toggleClass(CLASS_NAME_SHOW)
-      .trigger($.Event(EVENT_SHOWN, relatedTarget))
+    this._menu.classList.toggle(CLASS_NAME_SHOW)
+    this._element.classList.toggle(CLASS_NAME_SHOW)
+    EventHandler.trigger(this._element, EVENT_SHOWN, relatedTarget)
   }
 
   hide() {
-    if (this._element.disabled || $(this._element).hasClass(CLASS_NAME_DISABLED) || !$(this._menu).hasClass(CLASS_NAME_SHOW)) {
+    if (isDisabled(this._element) || !this._menu.classList.contains(CLASS_NAME_SHOW)) {
       return
     }
 
     const relatedTarget = {
       relatedTarget: this._element
     }
-    const hideEvent = $.Event(EVENT_HIDE, relatedTarget)
-    const parent = Dropdown._getParentFromElement(this._element)
-
-    $(parent).trigger(hideEvent)
 
-    if (hideEvent.isDefaultPrevented()) {
-      return
-    }
-
-    if (this._popper) {
-      this._popper.destroy()
-    }
-
-    $(this._menu).toggleClass(CLASS_NAME_SHOW)
-    $(parent)
-      .toggleClass(CLASS_NAME_SHOW)
-      .trigger($.Event(EVENT_HIDDEN, relatedTarget))
+    this._completeHide(relatedTarget)
   }
 
   dispose() {
-    $.removeData(this._element, DATA_KEY)
-    $(this._element).off(EVENT_KEY)
-    this._element = null
-    this._menu = null
-    if (this._popper !== null) {
+    if (this._popper) {
       this._popper.destroy()
-      this._popper = null
     }
+
+    super.dispose()
   }
 
   update() {
     this._inNavbar = this._detectNavbar()
-    if (this._popper !== null) {
-      this._popper.scheduleUpdate()
+    if (this._popper) {
+      this._popper.update()
     }
   }
 
   // Private
 
   _addEventListeners() {
-    $(this._element).on(EVENT_CLICK, event => {
+    EventHandler.on(this._element, EVENT_CLICK, event => {
       event.preventDefault()
-      event.stopPropagation()
       this.toggle()
     })
   }
 
+  _completeHide(relatedTarget) {
+    const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE, relatedTarget)
+    if (hideEvent.defaultPrevented) {
+      return
+    }
+
+    // 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', noop))
+    }
+
+    if (this._popper) {
+      this._popper.destroy()
+    }
+
+    this._menu.classList.remove(CLASS_NAME_SHOW)
+    this._element.classList.remove(CLASS_NAME_SHOW)
+    this._element.setAttribute('aria-expanded', 'false')
+    Manipulator.removeDataAttribute(this._menu, 'popper')
+    EventHandler.trigger(this._element, EVENT_HIDDEN, relatedTarget)
+  }
+
   _getConfig(config) {
     config = {
       ...this.constructor.Default,
-      ...$(this._element).data(),
+      ...Manipulator.getDataAttributes(this._element),
       ...config
     }
 
-    Util.typeCheckConfig(
-      NAME,
-      config,
-      this.constructor.DefaultType
-    )
+    typeCheckConfig(NAME, config, this.constructor.DefaultType)
+
+    if (typeof config.reference === 'object' && !isElement(config.reference) &&
+      typeof config.reference.getBoundingClientRect !== 'function'
+    ) {
+      // Popper virtual elements require a getBoundingClientRect method
+      throw new TypeError(`${NAME.toUpperCase()}: Option "reference" provided type "object" without a required "getBoundingClientRect" method.`)
+    }
 
     return config
   }
 
   _getMenuElement() {
-    if (!this._menu) {
-      const parent = Dropdown._getParentFromElement(this._element)
+    return SelectorEngine.next(this._element, SELECTOR_MENU)[0]
+  }
 
-      if (parent) {
-        this._menu = parent.querySelector(SELECTOR_MENU)
-      }
+  _getPlacement() {
+    const parentDropdown = this._element.parentNode
+
+    if (parentDropdown.classList.contains(CLASS_NAME_DROPEND)) {
+      return PLACEMENT_RIGHT
     }
 
-    return this._menu
-  }
+    if (parentDropdown.classList.contains(CLASS_NAME_DROPSTART)) {
+      return PLACEMENT_LEFT
+    }
 
-  _getPlacement() {
-    const $parentDropdown = $(this._element.parentNode)
-    let placement = PLACEMENT_BOTTOM
-
-    // Handle dropup
-    if ($parentDropdown.hasClass(CLASS_NAME_DROPUP)) {
-      placement = $(this._menu).hasClass(CLASS_NAME_MENURIGHT) ?
-        PLACEMENT_TOPEND :
-        PLACEMENT_TOP
-    } else if ($parentDropdown.hasClass(CLASS_NAME_DROPRIGHT)) {
-      placement = PLACEMENT_RIGHT
-    } else if ($parentDropdown.hasClass(CLASS_NAME_DROPLEFT)) {
-      placement = PLACEMENT_LEFT
-    } else if ($(this._menu).hasClass(CLASS_NAME_MENURIGHT)) {
-      placement = PLACEMENT_BOTTOMEND
-    }
-
-    return placement
+    // We need to trim the value because custom properties can also include spaces
+    const isEnd = getComputedStyle(this._menu).getPropertyValue('--bs-position').trim() === 'end'
+
+    if (parentDropdown.classList.contains(CLASS_NAME_DROPUP)) {
+      return isEnd ? PLACEMENT_TOPEND : PLACEMENT_TOP
+    }
+
+    return isEnd ? PLACEMENT_BOTTOMEND : PLACEMENT_BOTTOM
   }
 
   _detectNavbar() {
-    return $(this._element).closest('.navbar').length > 0
+    return this._element.closest(`.${CLASS_NAME_NAVBAR}`) !== null
   }
 
   _getOffset() {
-    const offset = {}
+    const { offset } = this._config
 
-    if (typeof this._config.offset === 'function') {
-      offset.fn = data => {
-        data.offsets = {
-          ...data.offsets,
-          ...(this._config.offset(data.offsets, this._element) || {})
-        }
+    if (typeof offset === 'string') {
+      return offset.split(',').map(val => Number.parseInt(val, 10))
+    }
 
-        return data
-      }
-    } else {
-      offset.offset = this._config.offset
+    if (typeof offset === 'function') {
+      return popperData => offset(popperData, this._element)
     }
 
     return offset
   }
 
   _getPopperConfig() {
-    const popperConfig = {
+    const defaultBsPopperConfig = {
       placement: this._getPlacement(),
-      modifiers: {
-        offset: this._getOffset(),
-        flip: {
-          enabled: this._config.flip
-        },
-        preventOverflow: {
-          boundariesElement: this._config.boundary
+      modifiers: [{
+        name: 'preventOverflow',
+        options: {
+          boundary: this._config.boundary
         }
-      }
+      },
+      {
+        name: 'offset',
+        options: {
+          offset: this._getOffset()
+        }
+      }]
     }
 
     // Disable Popper if we have a static display
     if (this._config.display === 'static') {
-      popperConfig.modifiers.applyStyle = {
+      defaultBsPopperConfig.modifiers = [{
+        name: 'applyStyles',
         enabled: false
-      }
+      }]
     }
 
     return {
-      ...popperConfig,
-      ...this._config.popperConfig
+      ...defaultBsPopperConfig,
+      ...(typeof this._config.popperConfig === 'function' ? this._config.popperConfig(defaultBsPopperConfig) : this._config.popperConfig)
     }
   }
 
+  _selectMenuItem(event) {
+    const items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, this._menu).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()
+  }
+
   // Static
 
-  static _jQueryInterface(config) {
-    return this.each(function () {
-      let data = $(this).data(DATA_KEY)
-      const _config = typeof config === 'object' ? config : null
+  static dropdownInterface(element, config) {
+    let data = Data.get(element, DATA_KEY)
+    const _config = typeof config === 'object' ? config : null
+
+    if (!data) {
+      data = new Dropdown(element, _config)
+    }
 
-      if (!data) {
-        data = new Dropdown(this, _config)
-        $(this).data(DATA_KEY, data)
+    if (typeof config === 'string') {
+      if (typeof data[config] === 'undefined') {
+        throw new TypeError(`No method named "${config}"`)
       }
 
-      if (typeof config === 'string') {
-        if (typeof data[config] === 'undefined') {
-          throw new TypeError(`No method named "${config}"`)
-        }
+      data[config]()
+    }
+  }
 
-        data[config]()
-      }
+  static jQueryInterface(config) {
+    return this.each(function () {
+      Dropdown.dropdownInterface(this, config)
     })
   }
 
-  static _clearMenus(event) {
-    if (event && (event.which === RIGHT_MOUSE_BUTTON_WHICH ||
-      event.type === 'keyup' && event.which !== TAB_KEYCODE)) {
+  static clearMenus(event) {
+    if (event && (event.button === RIGHT_MOUSE_BUTTON || (event.type === 'keyup' && event.key !== TAB_KEY))) {
       return
     }
 
-    const toggles = [].slice.call(document.querySelectorAll(SELECTOR_DATA_TOGGLE))
+    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 = $(toggles[i]).data(DATA_KEY)
-      const relatedTarget = {
-        relatedTarget: toggles[i]
-      }
-
-      if (event && event.type === 'click') {
-        relatedTarget.clickEvent = event
-      }
-
-      if (!context) {
-        continue
-      }
-
-      const dropdownMenu = context._menu
-      if (!$(parent).hasClass(CLASS_NAME_SHOW)) {
+      const context = Data.get(toggles[i], DATA_KEY)
+      if (!context || context._config.autoClose === false) {
         continue
       }
 
-      if (event && (event.type === 'click' &&
-          /input|textarea/i.test(event.target.tagName) || event.type === 'keyup' && event.which === TAB_KEYCODE) &&
-          $.contains(parent, event.target)) {
+      if (!context._element.classList.contains(CLASS_NAME_SHOW)) {
         continue
       }
 
-      const hideEvent = $.Event(EVENT_HIDE, relatedTarget)
-      $(parent).trigger(hideEvent)
-      if (hideEvent.isDefaultPrevented()) {
-        continue
+      const relatedTarget = {
+        relatedTarget: context._element
       }
 
-      // If this is a touch-enabled device we remove the extra
-      // empty mouseover listeners we added for iOS support
-      if ('ontouchstart' in document.documentElement) {
-        $(document.body).children().off('mouseover', null, $.noop)
-      }
+      if (event) {
+        const composedPath = event.composedPath()
+        const isMenuTarget = composedPath.includes(context._menu)
+        if (
+          composedPath.includes(context._element) ||
+          (context._config.autoClose === 'inside' && !isMenuTarget) ||
+          (context._config.autoClose === 'outside' && isMenuTarget)
+        ) {
+          continue
+        }
 
-      toggles[i].setAttribute('aria-expanded', 'false')
+        // Tab navigation through the dropdown menu or events from contained inputs shouldn't close the menu
+        if (context._menu.contains(event.target) && ((event.type === 'keyup' && event.key === TAB_KEY) || /input|select|option|textarea|form/i.test(event.target.tagName))) {
+          continue
+        }
 
-      if (context._popper) {
-        context._popper.destroy()
+        if (event.type === 'click') {
+          relatedTarget.clickEvent = event
+        }
       }
 
-      $(dropdownMenu).removeClass(CLASS_NAME_SHOW)
-      $(parent)
-        .removeClass(CLASS_NAME_SHOW)
-        .trigger($.Event(EVENT_HIDDEN, relatedTarget))
+      context._completeHide(relatedTarget)
     }
   }
 
-  static _getParentFromElement(element) {
-    let parent
-    const selector = Util.getSelectorFromElement(element)
-
-    if (selector) {
-      parent = document.querySelector(selector)
-    }
-
-    return parent || element.parentNode
+  static getParentFromElement(element) {
+    return getElementFromSelector(element) || element.parentNode
   }
 
-  // eslint-disable-next-line complexity
-  static _dataApiKeydownHandler(event) {
+  static dataApiKeydownHandler(event) {
     // If not input/textarea:
     //  - And not a key in REGEXP_KEYDOWN => not a dropdown command
     // If input/textarea:
@@ -449,57 +462,45 @@ class Dropdown {
     //    - 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.which === SPACE_KEYCODE || event.which !== ESCAPE_KEYCODE &&
-      (event.which !== ARROW_DOWN_KEYCODE && event.which !== ARROW_UP_KEYCODE ||
-        $(event.target).closest(SELECTOR_MENU).length) : !REGEXP_KEYDOWN.test(event.which)) {
-      return
-    }
-
-    if (this.disabled || $(this).hasClass(CLASS_NAME_DISABLED)) {
+      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
     }
 
-    const parent = Dropdown._getParentFromElement(this)
-    const isActive = $(parent).hasClass(CLASS_NAME_SHOW)
+    const isActive = this.classList.contains(CLASS_NAME_SHOW)
 
-    if (!isActive && event.which === ESCAPE_KEYCODE) {
+    if (!isActive && event.key === ESCAPE_KEY) {
       return
     }
 
     event.preventDefault()
     event.stopPropagation()
 
-    if (!isActive || (event.which === ESCAPE_KEYCODE || event.which === SPACE_KEYCODE)) {
-      if (event.which === ESCAPE_KEYCODE) {
-        $(parent.querySelector(SELECTOR_DATA_TOGGLE)).trigger('focus')
-      }
-
-      $(this).trigger('click')
+    if (isDisabled(this)) {
       return
     }
 
-    const items = [].slice.call(parent.querySelectorAll(SELECTOR_VISIBLE_ITEMS))
-      .filter(item => $(item).is(':visible'))
+    const getToggleButton = () => this.matches(SELECTOR_DATA_TOGGLE) ? this : SelectorEngine.prev(this, SELECTOR_DATA_TOGGLE)[0]
 
-    if (items.length === 0) {
+    if (event.key === ESCAPE_KEY) {
+      getToggleButton().focus()
+      Dropdown.clearMenus()
       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 (!isActive && (event.key === ARROW_UP_KEY || event.key === ARROW_DOWN_KEY)) {
+      getToggleButton().click()
+      return
     }
 
-    if (index < 0) {
-      index = 0
+    if (!isActive || event.key === SPACE_KEY) {
+      Dropdown.clearMenus()
+      return
     }
 
-    items[index].focus()
+    Dropdown.getInstance(getToggleButton())._selectMenuItem(event)
   }
 }
 
@@ -509,30 +510,22 @@ class Dropdown {
  * ------------------------------------------------------------------------
  */
 
-$(document)
-  .on(EVENT_KEYDOWN_DATA_API, SELECTOR_DATA_TOGGLE, Dropdown._dataApiKeydownHandler)
-  .on(EVENT_KEYDOWN_DATA_API, SELECTOR_MENU, Dropdown._dataApiKeydownHandler)
-  .on(`${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()
-  })
+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()
+  Dropdown.dropdownInterface(this)
+})
 
 /**
  * ------------------------------------------------------------------------
  * jQuery
  * ------------------------------------------------------------------------
+ * add .Dropdown to jQuery only if jQuery is present
  */
 
-$.fn[NAME] = Dropdown._jQueryInterface
-$.fn[NAME].Constructor = Dropdown
-$.fn[NAME].noConflict = () => {
-  $.fn[NAME] = JQUERY_NO_CONFLICT
-  return Dropdown._jQueryInterface
-}
+defineJQueryPlugin(Dropdown)
 
 export default Dropdown