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props.length; i++) {\n      var descriptor = props[i];\n      descriptor.enumerable = descriptor.enumerable || false;\n      descriptor.configurable = true;\n      if (\"value\" in descriptor) descriptor.writable = true;\n      Object.defineProperty(target, descriptor.key, descriptor);\n    }\n  }\n\n  function _createClass(Constructor, protoProps, staticProps) {\n    if (protoProps) _defineProperties(Constructor.prototype, protoProps);\n    if (staticProps) _defineProperties(Constructor, staticProps);\n    return Constructor;\n  }\n\n  /**\n   * ------------------------------------------------------------------------\n   * Constants\n   * ------------------------------------------------------------------------\n   */\n  var NAME = 'scrollspy';\n  var VERSION = '4.3.1';\n  var DATA_KEY = 'bs.scrollspy';\n  var EVENT_KEY = \".\".concat(DATA_KEY);\n  var DATA_API_KEY = '.data-api';\n  var JQUERY_NO_CONFLICT = _jquery2.default.fn[NAME];\n  var Default = {\n    offset: 10,\n    method: 'auto',\n    target: ''\n  };\n  var DefaultType = {\n    offset: 'number',\n    method: 'string',\n    target: '(string|element)'\n  };\n  var Event = {\n    ACTIVATE: \"activate\".concat(EVENT_KEY),\n    SCROLL: \"scroll\".concat(EVENT_KEY),\n    LOAD_DATA_API: \"load\".concat(EVENT_KEY).concat(DATA_API_KEY)\n  };\n  var ClassName = {\n    DROPDOWN_ITEM: 'dropdown-item',\n    DROPDOWN_MENU: 'dropdown-menu',\n    ACTIVE: 'active'\n  };\n  var 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  var OffsetMethod = {\n    OFFSET: 'offset',\n    POSITION: 'position'\n    /**\n     * ------------------------------------------------------------------------\n     * Class Definition\n     * ------------------------------------------------------------------------\n     */\n\n  };\n\n  var ScrollSpy = function () {\n    function ScrollSpy(element, config) {\n      var _this = this;\n\n      _classCallCheck(this, ScrollSpy);\n\n      this._element = element;\n      this._scrollElement = element.tagName === 'BODY' ? window : element;\n      this._config = this._getConfig(config);\n      this._selector = \"\".concat(this._config.target, \" \").concat(Selector.NAV_LINKS, \",\") + \"\".concat(this._config.target, \" \").concat(Selector.LIST_ITEMS, \",\") + \"\".concat(this._config.target, \" \").concat(Selector.DROPDOWN_ITEMS);\n      this._offsets = [];\n      this._targets = [];\n      this._activeTarget = null;\n      this._scrollHeight = 0;\n      (0, _jquery2.default)(this._scrollElement).on(Event.SCROLL, function (event) {\n        return _this._process(event);\n      });\n      this.refresh();\n\n      this._process();\n    } // Getters\n\n\n    _createClass(ScrollSpy, [{\n      key: \"refresh\",\n      value: function refresh() {\n        var _this2 = this;\n\n        var autoMethod = this._scrollElement === this._scrollElement.window ? OffsetMethod.OFFSET : OffsetMethod.POSITION;\n        var offsetMethod = this._config.method === 'auto' ? autoMethod : this._config.method;\n        var offsetBase = offsetMethod === OffsetMethod.POSITION ? this._getScrollTop() : 0;\n        this._offsets = [];\n        this._targets = [];\n        this._scrollHeight = this._getScrollHeight();\n        var targets = [].slice.call(document.querySelectorAll(this._selector));\n        targets.map(function (element) {\n          var target;\n\n          var targetSelector = _util2.default.getSelectorFromElement(element);\n\n          if (targetSelector) {\n            target = document.querySelector(targetSelector);\n          }\n\n          if (target) {\n            var targetBCR = target.getBoundingClientRect();\n\n            if (targetBCR.width || targetBCR.height) {\n              // TODO (fat): remove sketch reliance on jQuery position/offset\n              return [(0, _jquery2.default)(target)[offsetMethod]().top + offsetBase, targetSelector];\n            }\n          }\n\n          return null;\n        }).filter(function (item) {\n          return item;\n        }).sort(function (a, b) {\n          return a[0] - b[0];\n        }).forEach(function (item) {\n          _this2._offsets.push(item[0]);\n\n          _this2._targets.push(item[1]);\n        });\n      }\n    }, {\n      key: \"dispose\",\n      value: function dispose() {\n        _jquery2.default.removeData(this._element, DATA_KEY);\n\n        (0, _jquery2.default)(this._scrollElement).off(EVENT_KEY);\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      key: \"_getConfig\",\n      value: function _getConfig(config) {\n        config = _objectSpread({}, Default, _typeof(config) === 'object' && config ? config : {});\n\n        if (typeof config.target !== 'string') {\n          var id = (0, _jquery2.default)(config.target).attr('id');\n\n          if (!id) {\n            id = _util2.default.getUID(NAME);\n            (0, _jquery2.default)(config.target).attr('id', id);\n          }\n\n          config.target = \"#\".concat(id);\n        }\n\n        _util2.default.typeCheckConfig(NAME, config, DefaultType);\n\n        return config;\n      }\n    }, {\n      key: \"_getScrollTop\",\n      value: function _getScrollTop() {\n        return this._scrollElement === window ? this._scrollElement.pageYOffset : this._scrollElement.scrollTop;\n      }\n    }, {\n      key: \"_getScrollHeight\",\n      value: function _getScrollHeight() {\n        return this._scrollElement.scrollHeight || Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);\n      }\n    }, {\n      key: \"_getOffsetHeight\",\n      value: function _getOffsetHeight() {\n        return this._scrollElement === window ? window.innerHeight : this._scrollElement.getBoundingClientRect().height;\n      }\n    }, {\n      key: \"_process\",\n      value: function _process() {\n        var scrollTop = this._getScrollTop() + this._config.offset;\n\n        var scrollHeight = this._getScrollHeight();\n\n        var maxScroll = this._config.offset + scrollHeight - this._getOffsetHeight();\n\n        if (this._scrollHeight !== scrollHeight) {\n          this.refresh();\n        }\n\n        if (scrollTop >= maxScroll) {\n          var 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\n          this._clear();\n\n          return;\n        }\n\n        var offsetLength = this._offsets.length;\n\n        for (var i = offsetLength; i--;) {\n          var isActiveTarget = this._activeTarget !== this._targets[i] && scrollTop >= this._offsets[i] && (typeof this._offsets[i + 1] === 'undefined' || scrollTop < this._offsets[i + 1]);\n\n          if (isActiveTarget) {\n            this._activate(this._targets[i]);\n          }\n        }\n      }\n    }, {\n      key: \"_activate\",\n      value: function _activate(target) {\n        this._activeTarget = target;\n\n        this._clear();\n\n        var queries = this._selector.split(',').map(function (selector) {\n          return \"\".concat(selector, \"[data-target=\\\"\").concat(target, \"\\\"],\").concat(selector, \"[href=\\\"\").concat(target, \"\\\"]\");\n        });\n\n        var $link = (0, _jquery2.default)([].slice.call(document.querySelectorAll(queries.join(','))));\n\n        if ($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); // Set triggered links parents as active\n          // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor\n\n          $link.parents(Selector.NAV_LIST_GROUP).prev(\"\".concat(Selector.NAV_LINKS, \", \").concat(Selector.LIST_ITEMS)).addClass(ClassName.ACTIVE); // Handle special case when .nav-link is inside .nav-item\n\n          $link.parents(Selector.NAV_LIST_GROUP).prev(Selector.NAV_ITEMS).children(Selector.NAV_LINKS).addClass(ClassName.ACTIVE);\n        }\n\n        (0, _jquery2.default)(this._scrollElement).trigger(Event.ACTIVATE, {\n          relatedTarget: target\n        });\n      }\n    }, {\n      key: \"_clear\",\n      value: function _clear() {\n        [].slice.call(document.querySelectorAll(this._selector)).filter(function (node) {\n          return node.classList.contains(ClassName.ACTIVE);\n        }).forEach(function (node) {\n          return node.classList.remove(ClassName.ACTIVE);\n        });\n      }\n    }], [{\n      key: \"_jQueryInterface\",\n      value: function _jQueryInterface(config) {\n        return this.each(function () {\n          var data = (0, _jquery2.default)(this).data(DATA_KEY);\n\n          var _config = _typeof(config) === 'object' && config;\n\n          if (!data) {\n            data = new ScrollSpy(this, _config);\n            (0, _jquery2.default)(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 \\\"\".concat(config, \"\\\"\"));\n            }\n\n            data[config]();\n          }\n        });\n      }\n    }, {\n      key: \"VERSION\",\n      get: function get() {\n        return VERSION;\n      }\n    }, {\n      key: \"Default\",\n      get: function get() {\n        return Default;\n      }\n    }]);\n\n    return ScrollSpy;\n  }();\n\n  /**\n   * ------------------------------------------------------------------------\n   * Data Api implementation\n   * ------------------------------------------------------------------------\n   */\n  (0, _jquery2.default)(window).on(Event.LOAD_DATA_API, function () {\n    var scrollSpys = [].slice.call(document.querySelectorAll(Selector.DATA_SPY));\n    var scrollSpysLength = scrollSpys.length;\n\n    for (var i = scrollSpysLength; i--;) {\n      var $spy = (0, _jquery2.default)(scrollSpys[i]);\n\n      ScrollSpy._jQueryInterface.call($spy, $spy.data());\n    }\n  });\n  /**\n   * ------------------------------------------------------------------------\n   * jQuery\n   * ------------------------------------------------------------------------\n   */\n\n  _jquery2.default.fn[NAME] = ScrollSpy._jQueryInterface;\n  _jquery2.default.fn[NAME].Constructor = ScrollSpy;\n\n  _jquery2.default.fn[NAME].noConflict = function () {\n    _jquery2.default.fn[NAME] = JQUERY_NO_CONFLICT;\n    return ScrollSpy._jQueryInterface;\n  };\n\n  exports.default = ScrollSpy;\n});"],"file":"scrollspy.min.js"}