# All files / src tab.js

94.62% Statements 88/93
93.33% Branches 56/60
92.31% Functions 12/13
94.57% Lines 87/92

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

    import {
      getjQuery,
      TRANSITION_END,
      emulateTransitionEnd,
      getElementFromSelector,
      getTransitionDurationFromElement,
      reflow
    } from './util/index'
    import Data from './dom/data'
    import EventHandler from './dom/event-handler'
    import SelectorEngine from './dom/selector-engine'

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

    const NAME = 'tab'
    const VERSION = '3.2.2'
    const DATA_KEY = 'coreui.tab'
    const EVENT_KEY = `.${DATA_KEY}`
    const DATA_API_KEY = '.data-api'

    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${EVENT_KEY}${DATA_API_KEY}`

    const CLASS_NAME_DROPDOWN_MENU = 'dropdown-menu'
    const CLASS_NAME_ACTIVE = 'active'
    const CLASS_NAME_DISABLED = 'disabled'
    const CLASS_NAME_FADE = 'fade'
    const CLASS_NAME_SHOW = 'show'

    const SELECTOR_DROPDOWN = '.dropdown'
    const SELECTOR_NAV_LIST_GROUP = '.nav, .list-group'
    const SELECTOR_ACTIVE = '.active'
    const SELECTOR_ACTIVE_UL = ':scope > li > .active'
    const SELECTOR_DATA_TOGGLE = '[data-toggle="tab"], [data-toggle="pill"], [data-toggle="list"]'
    const SELECTOR_DROPDOWN_TOGGLE = '.dropdown-toggle'
    const SELECTOR_DROPDOWN_ACTIVE_CHILD = ':scope > .dropdown-menu .active'

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

    class Tab {
      constructor(element) {
        this._element = element

        Data.setData(this._element, DATA_KEY, this)
      }

      // Getters

      static get VERSION() {
        return VERSION
      }

      // Public

      show() {
        if ((this._element.parentNode &&
          this._element.parentNode.nodeType === Node.ELEMENT_NODE &&
          this._element.classList.contains(CLASS_NAME_ACTIVE)) ||
          this._element.classList.contains(CLASS_NAME_DISABLED)) {
          return
        }

        let previous
        const target = getElementFromSelector(this._element)
        const listElement = this._element.closest(SELECTOR_NAV_LIST_GROUP)

        Eif (listElement) {
          const itemSelector = listElement.nodeName === 'UL' || listElement.nodeName === 'OL' ? SELECTOR_ACTIVE_UL : SELECTOR_ACTIVE
          previous = SelectorEngine.find(itemSelector, listElement)
          previous = previous[previous.length - 1]
        }

        let hideEvent = null

        if (previous) {
          hideEvent = EventHandler.trigger(previous, EVENT_HIDE, {
            relatedTarget: this._element
          })
        }

        const showEvent = EventHandler.trigger(this._element, EVENT_SHOW, {
          relatedTarget: previous
        })

        if (showEvent.defaultPrevented ||
          (hideEvent !== null && hideEvent.defaultPrevented)) {
          return
        }

        this._activate(
          this._element,
          listElement
        )

        const complete = () => {
          EventHandler.trigger(previous, EVENT_HIDDEN, {
            relatedTarget: this._element
          })
          EventHandler.trigger(this._element, EVENT_SHOWN, {
            relatedTarget: previous
          })
        }

        if (target) {
          this._activate(target, target.parentNode, complete)
        } else {
          complete()
        }
      }

      dispose() {
        Data.removeData(this._element, DATA_KEY)
        this._element = null
      }

      // Private

      _activate(element, container, callback) {
        const activeElements = container && (container.nodeName === 'UL' || container.nodeName === 'OL') ?
          SelectorEngine.find(SELECTOR_ACTIVE_UL, container) :
          SelectorEngine.children(container, SELECTOR_ACTIVE)

        const active = activeElements[0]
        const isTransitioning = callback &&
          (active && active.classList.contains(CLASS_NAME_FADE))

        const complete = () => this._transitionComplete(
          element,
          active,
          callback
        )

        if (active && isTransitioning) {
          const transitionDuration = getTransitionDurationFromElement(active)
          active.classList.remove(CLASS_NAME_SHOW)

          EventHandler.one(active, TRANSITION_END, complete)
          emulateTransitionEnd(active, transitionDuration)
        } else {
          complete()
        }
      }

      _transitionComplete(element, active, callback) {
        if (active) {
          active.classList.remove(CLASS_NAME_ACTIVE)

          const dropdownChild = SelectorEngine.findOne(SELECTOR_DROPDOWN_ACTIVE_CHILD, active.parentNode)

          if (dropdownChild) {
            dropdownChild.classList.remove(CLASS_NAME_ACTIVE)
          }

          if (active.getAttribute('role') === 'tab') {
            active.setAttribute('aria-selected', false)
          }
        }

        element.classList.add(CLASS_NAME_ACTIVE)
        if (element.getAttribute('role') === 'tab') {
          element.setAttribute('aria-selected', true)
        }

        reflow(element)

        if (element.classList.contains(CLASS_NAME_FADE)) {
          element.classList.add(CLASS_NAME_SHOW)
        }

        Iif (element.parentNode && element.parentNode.classList.contains(CLASS_NAME_DROPDOWN_MENU)) {
          const dropdownElement = element.closest(SELECTOR_DROPDOWN)

          if (dropdownElement) {
            SelectorEngine.find(SELECTOR_DROPDOWN_TOGGLE)
              .forEach(dropdown => dropdown.classList.add(CLASS_NAME_ACTIVE))
          }

          element.setAttribute('aria-expanded', true)
        }

        if (callback) {
          callback()
        }
      }

      // Static

      static jQueryInterface(config) {
        return this.each(function () {
          const data = Data.getData(this, DATA_KEY) || new Tab(this)

          if (typeof config === 'string') {
            if (typeof data[config] === 'undefined') {
              throw new TypeError(`No method named "${config}"`)
            }

            data[config]()
          }
        })
      }

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

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

    EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {
      event.preventDefault()

      const data = Data.getData(this, DATA_KEY) || new Tab(this)
      data.show()
    })

    const $ = getjQuery()

    /**
     * ------------------------------------------------------------------------
     * jQuery
     * ------------------------------------------------------------------------
     * add .tab to jQuery only if jQuery is present
     */
    /* istanbul ignore if */
    if ($) {
      const JQUERY_NO_CONFLICT = $.fn[NAME]
      $.fn[NAME] = Tab.jQueryInterface
      $.fn[NAME].Constructor = Tab
      $.fn[NAME].noConflict = () => {
        $.fn[NAME] = JQUERY_NO_CONFLICT
        return Tab.jQueryInterface
      }
    }

    export default Tab