{"version":3,"file":"scrollspy.js","sources":["../src/util/index.js","../src/scrollspy.js"],"sourcesContent":["/**\n * --------------------------------------------------------------------------\n * Bootstrap (v5.0.0-alpha3): util/index.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst MAX_UID = 1000000\nconst MILLISECONDS_MULTIPLIER = 1000\nconst TRANSITION_END = 'transitionend'\n\n// Shoutout AngusCroll (https://goo.gl/pxwQGp)\nconst toType = obj => {\n  if (obj === null || obj === undefined) {\n    return `${obj}`\n  }\n\n  return {}.toString.call(obj).match(/\\s([a-z]+)/i)[1].toLowerCase()\n}\n\n/**\n * --------------------------------------------------------------------------\n * Public Util Api\n * --------------------------------------------------------------------------\n */\n\nconst getUID = prefix => {\n  do {\n    prefix += Math.floor(Math.random() * MAX_UID)\n  } while (document.getElementById(prefix))\n\n  return prefix\n}\n\nconst getSelector = element => {\n  let selector = element.getAttribute('data-target')\n\n  if (!selector || selector === '#') {\n    const hrefAttr = element.getAttribute('href')\n\n    selector = hrefAttr && hrefAttr !== '#' ? hrefAttr.trim() : null\n  }\n\n  return selector\n}\n\nconst getSelectorFromElement = element => {\n  const selector = getSelector(element)\n\n  if (selector) {\n    return document.querySelector(selector) ? selector : null\n  }\n\n  return null\n}\n\nconst getElementFromSelector = element => {\n  const selector = getSelector(element)\n\n  return selector ? document.querySelector(selector) : null\n}\n\nconst getTransitionDurationFromElement = element => {\n  if (!element) {\n    return 0\n  }\n\n  // Get transition-duration of the element\n  let {\n    transitionDuration,\n    transitionDelay\n  } = window.getComputedStyle(element)\n\n  const floatTransitionDuration = parseFloat(transitionDuration)\n  const floatTransitionDelay = parseFloat(transitionDelay)\n\n  // Return 0 if element or transition duration is not found\n  if (!floatTransitionDuration && !floatTransitionDelay) {\n    return 0\n  }\n\n  // If multiple durations are defined, take the first\n  transitionDuration = transitionDuration.split(',')[0]\n  transitionDelay = transitionDelay.split(',')[0]\n\n  return (parseFloat(transitionDuration) + parseFloat(transitionDelay)) * MILLISECONDS_MULTIPLIER\n}\n\nconst triggerTransitionEnd = element => {\n  element.dispatchEvent(new Event(TRANSITION_END))\n}\n\nconst isElement = obj => (obj[0] || obj).nodeType\n\nconst emulateTransitionEnd = (element, duration) => {\n  let called = false\n  const durationPadding = 5\n  const emulatedDuration = duration + durationPadding\n  function listener() {\n    called = true\n    element.removeEventListener(TRANSITION_END, listener)\n  }\n\n  element.addEventListener(TRANSITION_END, listener)\n  setTimeout(() => {\n    if (!called) {\n      triggerTransitionEnd(element)\n    }\n  }, emulatedDuration)\n}\n\nconst typeCheckConfig = (componentName, config, configTypes) => {\n  Object.keys(configTypes).forEach(property => {\n    const expectedTypes = configTypes[property]\n    const value = config[property]\n    const valueType = value && isElement(value) ?\n      'element' :\n      toType(value)\n\n    if (!new RegExp(expectedTypes).test(valueType)) {\n      throw new Error(\n        `${componentName.toUpperCase()}: ` +\n        `Option \"${property}\" provided type \"${valueType}\" ` +\n        `but expected type \"${expectedTypes}\".`)\n    }\n  })\n}\n\nconst isVisible = element => {\n  if (!element) {\n    return false\n  }\n\n  if (element.style && element.parentNode && element.parentNode.style) {\n    const elementStyle = getComputedStyle(element)\n    const parentNodeStyle = getComputedStyle(element.parentNode)\n\n    return elementStyle.display !== 'none' &&\n      parentNodeStyle.display !== 'none' &&\n      elementStyle.visibility !== 'hidden'\n  }\n\n  return false\n}\n\nconst findShadowRoot = element => {\n  if (!document.documentElement.attachShadow) {\n    return null\n  }\n\n  // Can find the shadow root otherwise it'll return the document\n  if (typeof element.getRootNode === 'function') {\n    const root = element.getRootNode()\n    return root instanceof ShadowRoot ? root : null\n  }\n\n  if (element instanceof ShadowRoot) {\n    return element\n  }\n\n  // when we don't find a shadow root\n  if (!element.parentNode) {\n    return null\n  }\n\n  return findShadowRoot(element.parentNode)\n}\n\nconst noop = () => function () {}\n\nconst reflow = element => element.offsetHeight\n\nconst getjQuery = () => {\n  const { jQuery } = window\n\n  if (jQuery && !document.body.hasAttribute('data-no-jquery')) {\n    return jQuery\n  }\n\n  return null\n}\n\nconst onDOMContentLoaded = callback => {\n  if (document.readyState === 'loading') {\n    document.addEventListener('DOMContentLoaded', callback)\n  } else {\n    callback()\n  }\n}\n\nexport {\n  TRANSITION_END,\n  getUID,\n  getSelectorFromElement,\n  getElementFromSelector,\n  getTransitionDurationFromElement,\n  triggerTransitionEnd,\n  isElement,\n  emulateTransitionEnd,\n  typeCheckConfig,\n  isVisible,\n  findShadowRoot,\n  noop,\n  reflow,\n  getjQuery,\n  onDOMContentLoaded\n}\n","/**\n * --------------------------------------------------------------------------\n * Bootstrap (v5.0.0-alpha3): scrollspy.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nimport {\n  getjQuery,\n  onDOMContentLoaded,\n  getSelectorFromElement,\n  getUID,\n  isElement,\n  typeCheckConfig\n} from './util/index'\nimport Data from './dom/data'\nimport EventHandler from './dom/event-handler'\nimport Manipulator from './dom/manipulator'\nimport SelectorEngine from './dom/selector-engine'\n\n/**\n * ------------------------------------------------------------------------\n * Constants\n * ------------------------------------------------------------------------\n */\n\nconst NAME = 'scrollspy'\nconst VERSION = '5.0.0-alpha3'\nconst DATA_KEY = 'bs.scrollspy'\nconst EVENT_KEY = `.${DATA_KEY}`\nconst DATA_API_KEY = '.data-api'\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_ACTIVATE = `activate${EVENT_KEY}`\nconst EVENT_SCROLL = `scroll${EVENT_KEY}`\nconst EVENT_LOAD_DATA_API = `load${EVENT_KEY}${DATA_API_KEY}`\n\nconst CLASS_NAME_DROPDOWN_ITEM = 'dropdown-item'\nconst CLASS_NAME_ACTIVE = 'active'\n\nconst SELECTOR_DATA_SPY = '[data-spy=\"scroll\"]'\nconst SELECTOR_NAV_LIST_GROUP = '.nav, .list-group'\nconst SELECTOR_NAV_LINKS = '.nav-link'\nconst SELECTOR_NAV_ITEMS = '.nav-item'\nconst SELECTOR_LIST_ITEMS = '.list-group-item'\nconst SELECTOR_DROPDOWN = '.dropdown'\nconst SELECTOR_DROPDOWN_TOGGLE = '.dropdown-toggle'\n\nconst METHOD_OFFSET = 'offset'\nconst METHOD_POSITION = 'position'\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}, ${this._config.target} ${SELECTOR_LIST_ITEMS}, ${this._config.target} .${CLASS_NAME_DROPDOWN_ITEM}`\n    this._offsets = []\n    this._targets = []\n    this._activeTarget = null\n    this._scrollHeight = 0\n\n    EventHandler.on(this._scrollElement, EVENT_SCROLL, event => this._process(event))\n\n    this.refresh()\n    this._process()\n\n    Data.setData(element, DATA_KEY, this)\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      METHOD_OFFSET :\n      METHOD_POSITION\n\n    const offsetMethod = this._config.method === 'auto' ?\n      autoMethod :\n      this._config.method\n\n    const offsetBase = offsetMethod === METHOD_POSITION ?\n      this._getScrollTop() :\n      0\n\n    this._offsets = []\n    this._targets = []\n    this._scrollHeight = this._getScrollHeight()\n\n    const targets = SelectorEngine.find(this._selector)\n\n    targets.map(element => {\n      const targetSelector = getSelectorFromElement(element)\n      const target = targetSelector ? SelectorEngine.findOne(targetSelector) : null\n\n      if (target) {\n        const targetBCR = target.getBoundingClientRect()\n        if (targetBCR.width || targetBCR.height) {\n          return [\n            Manipulator[offsetMethod](target).top + offsetBase,\n            targetSelector\n          ]\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    Data.removeData(this._element, DATA_KEY)\n    EventHandler.off(this._scrollElement, 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' && isElement(config.target)) {\n      let { id } = config.target\n      if (!id) {\n        id = getUID(NAME)\n        config.target.id = id\n      }\n\n      config.target = `#${id}`\n    }\n\n    typeCheckConfig(NAME, config, DefaultType)\n\n    return config\n  }\n\n  _getScrollTop() {\n    return this._scrollElement === window ?\n      this._scrollElement.pageYOffset :\n      this._scrollElement.scrollTop\n  }\n\n  _getScrollHeight() {\n    return this._scrollElement.scrollHeight || Math.max(\n      document.body.scrollHeight,\n      document.documentElement.scrollHeight\n    )\n  }\n\n  _getOffsetHeight() {\n    return this._scrollElement === window ?\n      window.innerHeight :\n      this._scrollElement.getBoundingClientRect().height\n  }\n\n  _process() {\n    const scrollTop = this._getScrollTop() + this._config.offset\n    const scrollHeight = this._getScrollHeight()\n    const maxScroll = this._config.offset +\n      scrollHeight -\n      this._getOffsetHeight()\n\n    if (this._scrollHeight !== scrollHeight) {\n      this.refresh()\n    }\n\n    if (scrollTop >= maxScroll) {\n      const target = this._targets[this._targets.length - 1]\n\n      if (this._activeTarget !== target) {\n        this._activate(target)\n      }\n\n      return\n    }\n\n    if (this._activeTarget && scrollTop < this._offsets[0] && this._offsets[0] > 0) {\n      this._activeTarget = null\n      this._clear()\n      return\n    }\n\n    for (let i = this._offsets.length; i--;) {\n      const isActiveTarget = this._activeTarget !== this._targets[i] &&\n          scrollTop >= this._offsets[i] &&\n          (typeof this._offsets[i + 1] === 'undefined' ||\n              scrollTop < this._offsets[i + 1])\n\n      if (isActiveTarget) {\n        this._activate(this._targets[i])\n      }\n    }\n  }\n\n  _activate(target) {\n    this._activeTarget = target\n\n    this._clear()\n\n    const queries = this._selector.split(',')\n      .map(selector => `${selector}[data-target=\"${target}\"],${selector}[href=\"${target}\"]`)\n\n    const link = SelectorEngine.findOne(queries.join(','))\n\n    if (link.classList.contains(CLASS_NAME_DROPDOWN_ITEM)) {\n      SelectorEngine.findOne(SELECTOR_DROPDOWN_TOGGLE, link.closest(SELECTOR_DROPDOWN))\n        .classList.add(CLASS_NAME_ACTIVE)\n\n      link.classList.add(CLASS_NAME_ACTIVE)\n    } else {\n      // Set triggered link as active\n      link.classList.add(CLASS_NAME_ACTIVE)\n\n      SelectorEngine.parents(link, SELECTOR_NAV_LIST_GROUP)\n        .forEach(listGroup => {\n          // Set triggered links parents as active\n          // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor\n          SelectorEngine.prev(listGroup, `${SELECTOR_NAV_LINKS}, ${SELECTOR_LIST_ITEMS}`)\n            .forEach(item => item.classList.add(CLASS_NAME_ACTIVE))\n\n          // Handle special case when .nav-link is inside 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