Bootstrap/js/dist/scrollspy.js

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

/**
 * --------------------------------------------------------------------------
 * Bootstrap (vv4.0.0-beta.2): scrollspy.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */
var ScrollSpy = function () {
  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */
  var NAME = 'scrollspy';
  var VERSION = 'v4.0.0-beta.2';
  var DATA_KEY = 'bs.scrollspy';
  var EVENT_KEY = "." + DATA_KEY;
  var DATA_API_KEY = '.data-api';
  var JQUERY_NO_CONFLICT = $.fn[NAME];
  var Default = {
    offset: 10,
    method: 'auto',
    target: ''
  };
  var DefaultType = {
    offset: 'number',
    method: 'string',
    target: '(string|element)'
  };
  var Event = {
    ACTIVATE: "activate" + EVENT_KEY,
    SCROLL: "scroll" + EVENT_KEY,
    LOAD_DATA_API: "load" + EVENT_KEY + DATA_API_KEY
  };
  var ClassName = {
    DROPDOWN_ITEM: 'dropdown-item',
    DROPDOWN_MENU: 'dropdown-menu',
    ACTIVE: 'active'
  };
  var 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'
  };
  var OffsetMethod = {
    OFFSET: 'offset',
    POSITION: 'position'
    /**
     * ------------------------------------------------------------------------
     * Class Definition
     * ------------------------------------------------------------------------
     */

  };

  var ScrollSpy =
  /*#__PURE__*/
  function () {
    function ScrollSpy(element, config) {
      var _this = this;

      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, function (event) {
        return _this._process(event);
      });
      this.refresh();

      this._process();
    } // getters


    var _proto = ScrollSpy.prototype;

    // public
    _proto.refresh = function refresh() {
      var _this2 = this;

      var autoMethod = this._scrollElement !== this._scrollElement.window ? OffsetMethod.POSITION : OffsetMethod.OFFSET;
      var offsetMethod = this._config.method === 'auto' ? autoMethod : this._config.method;
      var offsetBase = offsetMethod === OffsetMethod.POSITION ? this._getScrollTop() : 0;
      this._offsets = [];
      this._targets = [];
      this._scrollHeight = this._getScrollHeight();
      var targets = $.makeArray($(this._selector));
      targets.map(function (element) {
        var target;
        var targetSelector = Util.getSelectorFromElement(element);

        if (targetSelector) {
          target = $(targetSelector)[0];
        }

        if (target) {
          var 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(function (item) {
        return item;
      }).sort(function (a, b) {
        return a[0] - b[0];
      }).forEach(function (item) {
        _this2._offsets.push(item[0]);

        _this2._targets.push(item[1]);
      });
    };

    _proto.dispose = function 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


    _proto._getConfig = function _getConfig(config) {
      config = $.extend({}, Default, config);

      if (typeof config.target !== 'string') {
        var 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;
    };

    _proto._getScrollTop = function _getScrollTop() {
      return this._scrollElement === window ? this._scrollElement.pageYOffset : this._scrollElement.scrollTop;
    };

    _proto._getScrollHeight = function _getScrollHeight() {
      return this._scrollElement.scrollHeight || Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
    };

    _proto._getOffsetHeight = function _getOffsetHeight() {
      return this._scrollElement === window ? window.innerHeight : this._scrollElement.getBoundingClientRect().height;
    };

    _proto._process = function _process() {
      var scrollTop = this._getScrollTop() + this._config.offset;

      var scrollHeight = this._getScrollHeight();

      var maxScroll = this._config.offset + scrollHeight - this._getOffsetHeight();

      if (this._scrollHeight !== scrollHeight) {
        this.refresh();
      }

      if (scrollTop >= maxScroll) {
        var 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 (var i = this._offsets.length; i--;) {
        var 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]);
        }
      }
    };

    _proto._activate = function _activate(target) {
      this._activeTarget = target;

      this._clear();

      var queries = this._selector.split(','); // eslint-disable-next-line arrow-body-style


      queries = queries.map(function (selector) {
        return selector + "[data-target=\"" + target + "\"]," + (selector + "[href=\"" + target + "\"]");
      });
      var $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 <ul> and <nav> markup a parent is the previous sibling of any nav ancestor

        $link.parents(Selector.NAV_LIST_GROUP).prev(Selector.NAV_LINKS + ", " + Selector.LIST_ITEMS).addClass(ClassName.ACTIVE); // Handle special case when .nav-link is inside .nav-item

        $link.parents(Selector.NAV_LIST_GROUP).prev(Selector.NAV_ITEMS).children(Selector.NAV_LINKS).addClass(ClassName.ACTIVE);
      }

      $(this._scrollElement).trigger(Event.ACTIVATE, {
        relatedTarget: target
      });
    };

    _proto._clear = function _clear() {
      $(this._selector).filter(Selector.ACTIVE).removeClass(ClassName.ACTIVE);
    }; // static


    ScrollSpy._jQueryInterface = function _jQueryInterface(config) {
      return this.each(function () {
        var data = $(this).data(DATA_KEY);

        var _config = typeof config === 'object' && config;

        if (!data) {
          data = new ScrollSpy(this, _config);
          $(this).data(DATA_KEY, data);
        }

        if (typeof config === 'string') {
          if (typeof data[config] === 'undefined') {
            throw new Error("No method named \"" + config + "\"");
          }

          data[config]();
        }
      });
    };

    _createClass(ScrollSpy, null, [{
      key: "VERSION",
      get: function get() {
        return VERSION;
      }
    }, {
      key: "Default",
      get: function get() {
        return Default;
      }
    }]);

    return ScrollSpy;
  }();
  /**
   * ------------------------------------------------------------------------
   * Data Api implementation
   * ------------------------------------------------------------------------
   */


  $(window).on(Event.LOAD_DATA_API, function () {
    var scrollSpys = $.makeArray($(Selector.DATA_SPY));

    for (var i = scrollSpys.length; i--;) {
      var $spy = $(scrollSpys[i]);

      ScrollSpy._jQueryInterface.call($spy, $spy.data());
    }
  });
  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   */

  $.fn[NAME] = ScrollSpy._jQueryInterface;
  $.fn[NAME].Constructor = ScrollSpy;

  $.fn[NAME].noConflict = function () {
    $.fn[NAME] = JQUERY_NO_CONFLICT;
    return ScrollSpy._jQueryInterface;
  };

  return ScrollSpy;
}($);
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