return to the original file structure to avoid breaking modularity

1 files changed, 357 insertions, 0 deletions

diff --git a/js/src/scrollspy.js b/js/src/scrollspy.js
new file mode 100644
index 0000000000..c379c62235
--- /dev/null
+++ b/js/src/scrollspy.js
@@ -0,0 +1,357 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v4.3.1): scrollspy.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+import {
+  getjQuery,
+  getSelectorFromElement,
+  getUID,
+  makeArray,
+  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'
+
+/**
+ * ------------------------------------------------------------------------
+ * Constants
+ * ------------------------------------------------------------------------
+ */
+
+const NAME = 'scrollspy'
+const VERSION = '4.3.1'
+const DATA_KEY = 'bs.scrollspy'
+const EVENT_KEY = `.${DATA_KEY}`
+const DATA_API_KEY = '.data-api'
+
+const Default = {
+  offset: 10,
+  method: 'auto',
+  target: ''
+}
+
+const DefaultType = {
+  offset: 'number',
+  method: 'string',
+  target: '(string|element)'
+}
+
+const Event = {
+  ACTIVATE: `activate${EVENT_KEY}`,
+  SCROLL: `scroll${EVENT_KEY}`,
+  LOAD_DATA_API: `load${EVENT_KEY}${DATA_API_KEY}`
+}
+
+const ClassName = {
+  DROPDOWN_ITEM: 'dropdown-item',
+  ACTIVE: 'active'
+}
+
+const Selector = {
+  DATA_SPY: '[data-spy="scroll"]',
+  NAV_LIST_GROUP: '.nav, .list-group',
+  NAV_LINKS: '.nav-link',
+  NAV_ITEMS: '.nav-item',
+  LIST_ITEMS: '.list-group-item',
+  DROPDOWN: '.dropdown',
+  DROPDOWN_TOGGLE: '.dropdown-toggle'
+}
+
+const OffsetMethod = {
+  OFFSET: 'offset',
+  POSITION: 'position'
+}
+
+/**
+ * ------------------------------------------------------------------------
+ * Class Definition
+ * ------------------------------------------------------------------------
+ */
+
+class ScrollSpy {
+  constructor(element, config) {
+    this._element = element
+    this._scrollElement = element.tagName === 'BODY' ? window : element
+    this._config = this._getConfig(config)
+    this._selector = `${this._config.target} ${Selector.NAV_LINKS},` +
+                          `${this._config.target} ${Selector.LIST_ITEMS},` +
+                          `${this._config.target} .${ClassName.DROPDOWN_ITEM}`
+    this._offsets = []
+    this._targets = []
+    this._activeTarget = null
+    this._scrollHeight = 0
+
+    EventHandler.on(this._scrollElement, Event.SCROLL, event => this._process(event))
+
+    this.refresh()
+    this._process()
+
+    Data.setData(element, DATA_KEY, this)
+  }
+
+  // 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(SelectorEngine.find(this._selector))
+
+    targets
+      .map(element => {
+        let target
+        const targetSelector = getSelectorFromElement(element)
+
+        if (targetSelector) {
+          target = SelectorEngine.findOne(targetSelector)
+        }
+
+        if (target) {
+          const targetBCR = target.getBoundingClientRect()
+          if (targetBCR.width || targetBCR.height) {
+            return [
+              Manipulator[offsetMethod](target).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() {
+    Data.removeData(this._element, DATA_KEY)
+    EventHandler.off(this._scrollElement, 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,
+      ...typeof config === 'object' && config ? config : {}
+    }
+
+    if (typeof config.target !== 'string') {
+      let { id } = config.target
+      if (!id) {
+        id = getUID(NAME)
+        config.target.id = id
+      }
+
+      config.target = `#${id}`
+    }
+
+    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
+    }
+
+    const offsetLength = this._offsets.length
+    for (let i = offsetLength; 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()
+
+    const queries = this._selector.split(',')
+      .map(selector => `${selector}[data-target="${target}"],${selector}[href="${target}"]`)
+
+    const link = SelectorEngine.findOne(queries.join(','))
+
+    if (link.classList.contains(ClassName.DROPDOWN_ITEM)) {
+      SelectorEngine
+        .findOne(Selector.DROPDOWN_TOGGLE, SelectorEngine.closest(link, Selector.DROPDOWN))
+        .classList.add(ClassName.ACTIVE)
+
+      link.classList.add(ClassName.ACTIVE)
+    } else {
+      // Set triggered link as active
+      link.classList.add(ClassName.ACTIVE)
+
+      SelectorEngine
+        .parents(link, Selector.NAV_LIST_GROUP)
+        .forEach(listGroup => {
+          // Set triggered links parents as active
+          // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor
+          SelectorEngine.prev(listGroup, `${Selector.NAV_LINKS}, ${Selector.LIST_ITEMS}`)
+            .forEach(item => item.classList.add(ClassName.ACTIVE))
+
+          // Handle special case when .nav-link is inside .nav-item
+          SelectorEngine.prev(listGroup, Selector.NAV_ITEMS)
+            .forEach(navItem => {
+              SelectorEngine.children(navItem, Selector.NAV_LINKS)
+                .forEach(item => item.classList.add(ClassName.ACTIVE))
+            })
+        })
+    }
+
+    EventHandler.trigger(this._scrollElement, Event.ACTIVATE, {
+      relatedTarget: target
+    })
+  }
+
+  _clear() {
+    makeArray(SelectorEngine.find(this._selector))
+      .filter(node => node.classList.contains(ClassName.ACTIVE))
+      .forEach(node => node.classList.remove(ClassName.ACTIVE))
+  }
+
+  // Static
+
+  static jQueryInterface(config) {
+    return this.each(function () {
+      let data = Data.getData(this, DATA_KEY)
+      const _config = typeof config === 'object' && config
+
+      if (!data) {
+        data = new ScrollSpy(this, _config)
+      }
+
+      if (typeof config === 'string') {
+        if (typeof data[config] === 'undefined') {
+          throw new TypeError(`No method named "${config}"`)
+        }
+
+        data[config]()
+      }
+    })
+  }
+
+  static getInstance(element) {
+    return Data.getData(element, DATA_KEY)
+  }
+}
+
+/**
+ * ------------------------------------------------------------------------
+ * Data Api implementation
+ * ------------------------------------------------------------------------
+ */
+
+EventHandler.on(window, Event.LOAD_DATA_API, () => {
+  makeArray(SelectorEngine.find(Selector.DATA_SPY))
+    .forEach(spy => new ScrollSpy(spy, Manipulator.getDataAttributes(spy)))
+})
+
+const $ = getjQuery()
+
+/**
+ * ------------------------------------------------------------------------
+ * jQuery
+ * ------------------------------------------------------------------------
+ */
+/* istanbul ignore if */
+if ($) {
+  const JQUERY_NO_CONFLICT = $.fn[NAME]
+  $.fn[NAME] = ScrollSpy.jQueryInterface
+  $.fn[NAME].Constructor = ScrollSpy
+  $.fn[NAME].noConflict = () => {
+    $.fn[NAME] = JQUERY_NO_CONFLICT
+    return ScrollSpy.jQueryInterface
+  }
+}
+
+export default ScrollSpy