{"version":3,"file":"scrollspy.js","sources":["../src/scrollspy.js"],"sourcesContent":["import $ from 'jquery'\nimport Util from './util'\n\n/**\n * --------------------------------------------------------------------------\n * Bootstrap (v4.1.3): scrollspy.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\n/**\n * ------------------------------------------------------------------------\n * Constants\n * ------------------------------------------------------------------------\n */\n\nconst NAME               = 'scrollspy'\nconst VERSION            = '4.1.3'\nconst DATA_KEY           = 'bs.scrollspy'\nconst EVENT_KEY          = `.${DATA_KEY}`\nconst DATA_API_KEY       = '.data-api'\nconst JQUERY_NO_CONFLICT = $.fn[NAME]\n\nconst Default = {\n  offset : 10,\n  method : 'auto',\n  target : ''\n}\n\nconst DefaultType = {\n  offset : 'number',\n  method : 'string',\n  target : '(string|element)'\n}\n\nconst Event = {\n  ACTIVATE      : `activate${EVENT_KEY}`,\n  SCROLL        : `scroll${EVENT_KEY}`,\n  LOAD_DATA_API : `load${EVENT_KEY}${DATA_API_KEY}`\n}\n\nconst ClassName = {\n  DROPDOWN_ITEM : 'dropdown-item',\n  DROPDOWN_MENU : 'dropdown-menu',\n  ACTIVE        : 'active'\n}\n\nconst Selector = {\n  DATA_SPY        : '[data-spy=\"scroll\"]',\n  ACTIVE          : '.active',\n  NAV_LIST_GROUP  : '.nav, .list-group',\n  NAV_LINKS       : '.nav-link',\n  NAV_ITEMS       : '.nav-item',\n  LIST_ITEMS      : '.list-group-item',\n  DROPDOWN        : '.dropdown',\n  DROPDOWN_ITEMS  : '.dropdown-item',\n  DROPDOWN_TOGGLE : '.dropdown-toggle'\n}\n\nconst OffsetMethod = {\n  OFFSET   : 'offset',\n  POSITION : 'position'\n}\n\n/**\n * ------------------------------------------------------------------------\n * Class Definition\n * ------------------------------------------------------------------------\n */\n\nclass ScrollSpy {\n  constructor(element, config) {\n    this._element       = element\n    this._scrollElement = element.tagName === 'BODY' ? window : element\n    this._config        = this._getConfig(config)\n    this._selector      = `${this._config.target} ${Selector.NAV_LINKS},` +\n                          `${this._config.target} ${Selector.LIST_ITEMS},` +\n                          `${this._config.target} ${Selector.DROPDOWN_ITEMS}`\n    this._offsets       = []\n    this._targets       = []\n    this._activeTarget  = null\n    this._scrollHeight  = 0\n\n    $(this._scrollElement).on(Event.SCROLL, (event) => this._process(event))\n\n    this.refresh()\n    this._process()\n  }\n\n  // Getters\n\n  static get VERSION() {\n    return VERSION\n  }\n\n  static get Default() {\n    return Default\n  }\n\n  // Public\n\n  refresh() {\n    const autoMethod = this._scrollElement === this._scrollElement.window\n      ? OffsetMethod.OFFSET : OffsetMethod.POSITION\n\n    const offsetMethod = this._config.method === 'auto'\n      ? autoMethod : this._config.method\n\n    const offsetBase = offsetMethod === OffsetMethod.POSITION\n      ? this._getScrollTop() : 0\n\n    this._offsets = []\n    this._targets = []\n\n    this._scrollHeight = this._getScrollHeight()\n\n    const targets = [].slice.call(document.querySelectorAll(this._selector))\n\n    targets\n      .map((element) => {\n        let target\n        const targetSelector = Util.getSelectorFromElement(element)\n\n        if (targetSelector) {\n          target = document.querySelector(targetSelector)\n        }\n\n        if (target) {\n          const targetBCR = target.getBoundingClientRect()\n          if (targetBCR.width || targetBCR.height) {\n            // TODO (fat): remove sketch reliance on jQuery position/offset\n            return [\n              $(target)[offsetMethod]().top + offsetBase,\n              targetSelector\n            ]\n          }\n        }\n        return null\n      })\n      .filter((item) => item)\n      .sort((a, b) => a[0] - b[0])\n      .forEach((item) => {\n        this._offsets.push(item[0])\n        this._targets.push(item[1])\n      })\n  }\n\n  dispose() {\n    $.removeData(this._element, DATA_KEY)\n    $(this._scrollElement).off(EVENT_KEY)\n\n    this._element       = null\n    this._scrollElement = null\n    this._config        = null\n    this._selector      = null\n    this._offsets       = null\n    this._targets       = null\n    this._activeTarget  = null\n    this._scrollHeight  = null\n  }\n\n  // Private\n\n  _getConfig(config) {\n    config = {\n      ...Default,\n      ...typeof config === 'object' && config ? config : {}\n    }\n\n    if (typeof config.target !== 'string') {\n      let id = $(config.target).attr('id')\n      if (!id) {\n        id = Util.getUID(NAME)\n        $(config.target).attr('id', id)\n      }\n      config.target = `#${id}`\n    }\n\n    Util.typeCheckConfig(NAME, config, DefaultType)\n\n    return config\n  }\n\n  _getScrollTop() {\n    return this._scrollElement === window\n      ? this._scrollElement.pageYOffset : this._scrollElement.scrollTop\n  }\n\n  _getScrollHeight() {\n    return this._scrollElement.scrollHeight || Math.max(\n      document.body.scrollHeight,\n      document.documentElement.scrollHeight\n    )\n  }\n\n  _getOffsetHeight() {\n    return this._scrollElement === window\n      ? window.innerHeight : this._scrollElement.getBoundingClientRect().height\n  }\n\n  _process() {\n    const scrollTop    = this._getScrollTop() + this._config.offset\n    const scrollHeight = this._getScrollHeight()\n    const maxScroll    = this._config.offset +\n      scrollHeight -\n      this._getOffsetHeight()\n\n    if (this._scrollHeight !== scrollHeight) {\n      this.refresh()\n    }\n\n    if (scrollTop >= maxScroll) {\n      const target = this._targets[this._targets.length - 1]\n\n      if (this._activeTarget !== target) {\n        this._activate(target)\n      }\n      return\n    }\n\n    if (this._activeTarget && scrollTop < this._offsets[0] && this._offsets[0] > 0) {\n      this._activeTarget = null\n      this._clear()\n      return\n    }\n\n    const offsetLength = this._offsets.length\n    for (let i = offsetLength; i--;) {\n      const isActiveTarget = this._activeTarget !== this._targets[i] &&\n          scrollTop >= this._offsets[i] &&\n          (typeof this._offsets[i + 1] === 'undefined' ||\n              scrollTop < this._offsets[i + 1])\n\n      if (isActiveTarget) {\n        this._activate(this._targets[i])\n      }\n    }\n  }\n\n  _activate(target) {\n    this._activeTarget = target\n\n    this._clear()\n\n    let queries = this._selector.split(',')\n    // eslint-disable-next-line arrow-body-style\n    queries = queries.map((selector) => {\n      return `${selector}[data-target=\"${target}\"],` +\n              `${selector}[href=\"${target}\"]`\n    })\n\n    const $link = $([].slice.call(document.querySelectorAll(queries.join(','))))\n\n    if ($link.hasClass(ClassName.DROPDOWN_ITEM)) {\n      $link.closest(Selector.DROPDOWN).find(Selector.DROPDOWN_TOGGLE).addClass(ClassName.ACTIVE)\n      $link.addClass(ClassName.ACTIVE)\n    } else {\n      // Set triggered link as active\n      $link.addClass(ClassName.ACTIVE)\n      // Set triggered links parents as active\n      // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor\n      $link.parents(Selector.NAV_LIST_GROUP).prev(`${Selector.NAV_LINKS}, ${Selector.LIST_ITEMS}`).addClass(ClassName.ACTIVE)\n      // Handle special case when .nav-link is inside .nav-item\n      $link.parents(Selector.NAV_LIST_GROUP).prev(Selector.NAV_ITEMS).children(Selector.NAV_LINKS).addClass(ClassName.ACTIVE)\n    }\n\n    $(this._scrollElement).trigger(Event.ACTIVATE, {\n      relatedTarget: target\n    })\n  }\n\n  _clear() {\n    const nodes = [].slice.call(document.querySelectorAll(this._selector))\n    $(nodes).filter(Selector.ACTIVE).removeClass(ClassName.ACTIVE)\n  }\n\n  // Static\n\n  static _jQueryInterface(config) {\n    return this.each(function () {\n      let data = $(this).data(DATA_KEY)\n      const _config = typeof config === 'object' && config\n\n      if (!data) {\n        data = new ScrollSpy(this, _config)\n        $(this).data(DATA_KEY, data)\n      }\n\n      if (typeof config === 'string') {\n        if (typeof data[config] === 'undefined') {\n          throw new TypeError(`No method named \"${config}\"`)\n        }\n        data[config]()\n      }\n    })\n  }\n}\n\n/**\n * ------------------------------------------------------------------------\n * Data Api implementation\n * ------------------------------------------------------------------------\n */\n\n$(window).on(Event.LOAD_DATA_API, () => {\n  const scrollSpys = [].slice.call(document.querySelectorAll(Selector.DATA_SPY))\n\n  const 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