import $ from 'jquery' import Util from './util' /** * -------------------------------------------------------------------------- * Bootstrap (v4.0.0): scrollspy.js * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) * -------------------------------------------------------------------------- */ const ScrollSpy = (($) => { /** * ------------------------------------------------------------------------ * Constants * ------------------------------------------------------------------------ */ const NAME = 'scrollspy' const VERSION = '4.0.0' const DATA_KEY = 'bs.scrollspy' const EVENT_KEY = `.${DATA_KEY}` const DATA_API_KEY = '.data-api' const JQUERY_NO_CONFLICT = $.fn[NAME] const Default = { offset : 10, method : 'auto', target : '' } const DefaultType = { offset : 'number', method : 'string', target : '(string|element)' } const Event = { ACTIVATE : `activate${EVENT_KEY}`, SCROLL : `scroll${EVENT_KEY}`, LOAD_DATA_API : `load${EVENT_KEY}${DATA_API_KEY}` } const ClassName = { DROPDOWN_ITEM : 'dropdown-item', DROPDOWN_MENU : 'dropdown-menu', ACTIVE : 'active' } const Selector = { DATA_SPY : '[data-spy="scroll"]', ACTIVE : '.active', NAV_LIST_GROUP : '.nav, .list-group', NAV_LINKS : '.nav-link', NAV_ITEMS : '.nav-item', LIST_ITEMS : '.list-group-item', DROPDOWN : '.dropdown', DROPDOWN_ITEMS : '.dropdown-item', DROPDOWN_TOGGLE : '.dropdown-toggle' } const OffsetMethod = { OFFSET : 'offset', POSITION : 'position' } /** * ------------------------------------------------------------------------ * Class Definition * ------------------------------------------------------------------------ */ class ScrollSpy { constructor(element, config) { this._element = element this._scrollElement = element.tagName === 'BODY' ? window : element this._config = this._getConfig(config) this._selector = `${this._config.target} ${Selector.NAV_LINKS},` + `${this._config.target} ${Selector.LIST_ITEMS},` + `${this._config.target} ${Selector.DROPDOWN_ITEMS}` this._offsets = [] this._targets = [] this._activeTarget = null this._scrollHeight = 0 $(this._scrollElement).on(Event.SCROLL, (event) => this._process(event)) this.refresh() this._process() } // Getters static get VERSION() { return VERSION } static get Default() { return Default } // Public refresh() { const autoMethod = this._scrollElement === this._scrollElement.window ? OffsetMethod.OFFSET : OffsetMethod.POSITION const offsetMethod = this._config.method === 'auto' ? autoMethod : this._config.method const offsetBase = offsetMethod === OffsetMethod.POSITION ? this._getScrollTop() : 0 this._offsets = [] this._targets = [] this._scrollHeight = this._getScrollHeight() const targets = $.makeArray($(this._selector)) targets .map((element) => { let target const targetSelector = Util.getSelectorFromElement(element) if (targetSelector) { target = $(targetSelector)[0] } if (target) { const targetBCR = target.getBoundingClientRect() if (targetBCR.width || targetBCR.height) { // TODO (fat): remove sketch reliance on jQuery position/offset return [ $(target)[offsetMethod]().top + offsetBase, targetSelector ] } } return null }) .filter((item) => item) .sort((a, b) => a[0] - b[0]) .forEach((item) => { this._offsets.push(item[0]) this._targets.push(item[1]) }) } dispose() { $.removeData(this._element, DATA_KEY) $(this._scrollElement).off(EVENT_KEY) this._element = null this._scrollElement = null this._config = null this._selector = null this._offsets = null this._targets = null this._activeTarget = null this._scrollHeight = null } // Private _getConfig(config) { config = { ...Default, ...config } if (typeof config.target !== 'string') { let id = $(config.target).attr('id') if (!id) { id = Util.getUID(NAME) $(config.target).attr('id', id) } config.target = `#${id}` } Util.typeCheckConfig(NAME, config, DefaultType) return config } _getScrollTop() { return this._scrollElement === window ? this._scrollElement.pageYOffset : this._scrollElement.scrollTop } _getScrollHeight() { return this._scrollElement.scrollHeight || Math.max( document.body.scrollHeight, document.documentElement.scrollHeight ) } _getOffsetHeight() { return this._scrollElement === window ? window.innerHeight : this._scrollElement.getBoundingClientRect().height } _process() { const scrollTop = this._getScrollTop() + this._config.offset const scrollHeight = this._getScrollHeight() const maxScroll = this._config.offset + scrollHeight - this._getOffsetHeight() if (this._scrollHeight !== scrollHeight) { this.refresh() } if (scrollTop >= maxScroll) { const target = this._targets[this._targets.length - 1] if (this._activeTarget !== target) { this._activate(target) } return } if (this._activeTarget && scrollTop < this._offsets[0] && this._offsets[0] > 0) { this._activeTarget = null this._clear() return } for (let i = this._offsets.length; i--;) { const isActiveTarget = this._activeTarget !== this._targets[i] && scrollTop >= this._offsets[i] && (typeof this._offsets[i + 1] === 'undefined' || scrollTop < this._offsets[i + 1]) if (isActiveTarget) { this._activate(this._targets[i]) } } } _activate(target) { this._activeTarget = target this._clear() let queries = this._selector.split(',') // eslint-disable-next-line arrow-body-style queries = queries.map((selector) => { return `${selector}[data-target="${target}"],` + `${selector}[href="${target}"]` }) const $link = $(queries.join(',')) if ($link.hasClass(ClassName.DROPDOWN_ITEM)) { $link.closest(Selector.DROPDOWN).find(Selector.DROPDOWN_TOGGLE).addClass(ClassName.ACTIVE) $link.addClass(ClassName.ACTIVE) } else { // Set triggered link as active $link.addClass(ClassName.ACTIVE) // Set triggered links parents as active // With both