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Filename : dropdown.js
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/**
 * --------------------------------------------------------------------------
 * Bootstrap (v5.0.0-beta2): dropdown.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 * --------------------------------------------------------------------------
 */

import * as Popper from '@popperjs/core'

import {
    defineJQueryPlugin,
    getElementFromSelector,
    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'

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

const NAME = 'dropdown'
const DATA_KEY = 'bs.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_DROPEND = 'dropend'
const CLASS_NAME_DROPSTART = 'dropstart'
const CLASS_NAME_NAVBAR = 'navbar'

const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="dropdown"]'
const SELECTOR_FORM_CHILD = '.dropdown form'
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 = 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, 2],
    flip: true,
    boundary: 'clippingParents',
    reference: 'toggle',
    display: 'dynamic',
    popperConfig: null
}

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

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

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

        this._popper = null
        this._config = this._getConfig(config)
        this._menu = this._getMenuElement()
        this._inNavbar = this._detectNavbar()

        this._addEventListeners()
    }

    // Getters

    static get Default() {
        return Default
    }

    static get DefaultType() {
        return DefaultType
    }

    static get DATA_KEY() {
        return DATA_KEY
    }

    // Public

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

        const isActive = this._element.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(this._element, EVENT_SHOW, relatedTarget)

        if (showEvent.defaultPrevented) {
            return
        }

        // Totally disable Popper for Dropdowns in Navbar
        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)')
            }

            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]
                }
            } else if (typeof this._config.reference === 'object') {
                referenceElement = this._config.reference
            }

            const popperConfig = this._getPopperConfig()
            const isDisplayStatic = popperConfig.modifiers.find(modifier => modifier.name === 'applyStyles' && modifier.enabled === false)

            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
        // 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()))
        }

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

        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.classList.contains(CLASS_NAME_DISABLED) || !this._menu.classList.contains(CLASS_NAME_SHOW)) {
            return
        }

        const relatedTarget = {
            relatedTarget: this._element
        }

        const hideEvent = EventHandler.trigger(this._element, EVENT_HIDE, relatedTarget)

        if (hideEvent.defaultPrevented) {
            return
        }

        if (this._popper) {
            this._popper.destroy()
        }

        this._menu.classList.toggle(CLASS_NAME_SHOW)
        this._element.classList.toggle(CLASS_NAME_SHOW)
        Manipulator.removeDataAttribute(this._menu, 'popper')
        EventHandler.trigger(this._element, EVENT_HIDDEN, relatedTarget)
    }

    dispose() {
        super.dispose()
        EventHandler.off(this._element, EVENT_KEY)
        this._menu = null

        if (this._popper) {
            this._popper.destroy()
            this._popper = null
        }
    }

    update() {
        this._inNavbar = this._detectNavbar()
        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)

        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() {
        return SelectorEngine.next(this._element, SELECTOR_MENU)[0]
    }

    _getPlacement() {
        const parentDropdown = this._element.parentNode

        if (parentDropdown.classList.contains(CLASS_NAME_DROPEND)) {
            return PLACEMENT_RIGHT
        }

        if (parentDropdown.classList.contains(CLASS_NAME_DROPSTART)) {
            return PLACEMENT_LEFT
        }

        // 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(`.${CLASS_NAME_NAVBAR}`) !== null
    }

    _getOffset() {
        const {
            offset
        } = this._config

        if (typeof offset === 'string') {
            return offset.split(',').map(val => Number.parseInt(val, 10))
        }

        if (typeof offset === 'function') {
            return popperData => offset(popperData, this._element)
        }

        return offset
    }

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

        // Disable Popper if we have a static display
        if (this._config.display === 'static') {
            defaultBsPopperConfig.modifiers = [{
                name: 'applyStyles',
                enabled: false
            }]
        }

        return {
            ...defaultBsPopperConfig,
            ...(typeof this._config.popperConfig === 'function' ? this._config.popperConfig(defaultBsPopperConfig) : 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) {
        if (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 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 (!toggles[i].classList.contains(CLASS_NAME_SHOW)) {
                continue
            }

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

            const hideEvent = EventHandler.trigger(toggles[i], EVENT_HIDE, relatedTarget)
            if (hideEvent.defaultPrevented) {
                continue
            }

            // 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', null, noop()))
            }

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

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

            dropdownMenu.classList.remove(CLASS_NAME_SHOW)
            toggles[i].classList.remove(CLASS_NAME_SHOW)
            Manipulator.removeDataAttribute(dropdownMenu, 'popper')
            EventHandler.trigger(toggles[i], 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 = this.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
        }

        if (!isActive && (event.key === ARROW_UP_KEY || event.key === ARROW_DOWN_KEY)) {
            const button = this.matches(SELECTOR_DATA_TOGGLE) ? this : SelectorEngine.prev(this, SELECTOR_DATA_TOGGLE)[0]
            button.click()
            return
        }

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

        const items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, parent).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()
    }
}

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

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

defineJQueryPlugin(NAME, Dropdown)

export default Dropdown