scrollspy.js

/*!
  * Bootstrap scrollspy.js v4.3.1 (https://getbootstrap.com/)
  * Copyright 2011-2019 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('../dom/data.js'), require('../dom/event-handler.js'), require('../dom/manipulator.js'), require('../dom/selector-engine.js')) :
  typeof define === 'function' && define.amd ? define(['../dom/data.js', '../dom/event-handler.js', '../dom/manipulator.js', '../dom/selector-engine.js'], factory) :
  (global = global || self, global.ScrollSpy = factory(global.Data, global.EventHandler, global.Manipulator, global.SelectorEngine));
}(this, function (Data, EventHandler, Manipulator, SelectorEngine) { 'use strict';

  Data = Data && Data.hasOwnProperty('default') ? Data['default'] : Data;
  EventHandler = EventHandler && EventHandler.hasOwnProperty('default') ? EventHandler['default'] : EventHandler;
  Manipulator = Manipulator && Manipulator.hasOwnProperty('default') ? Manipulator['default'] : Manipulator;
  SelectorEngine = SelectorEngine && SelectorEngine.hasOwnProperty('default') ? SelectorEngine['default'] : SelectorEngine;

  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;
  }

  function _defineProperty(obj, key, value) {
    if (key in obj) {
      Object.defineProperty(obj, key, {
        value: value,
        enumerable: true,
        configurable: true,
        writable: true
      });
    } else {
      obj[key] = value;
    }

    return obj;
  }

  function ownKeys(object, enumerableOnly) {
    var keys = Object.keys(object);

    if (Object.getOwnPropertySymbols) {
      var symbols = Object.getOwnPropertySymbols(object);
      if (enumerableOnly) symbols = symbols.filter(function (sym) {
        return Object.getOwnPropertyDescriptor(object, sym).enumerable;
      });
      keys.push.apply(keys, symbols);
    }

    return keys;
  }

  function _objectSpread2(target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i] != null ? arguments[i] : {};

      if (i % 2) {
        ownKeys(source, true).forEach(function (key) {
          _defineProperty(target, key, source[key]);
        });
      } else if (Object.getOwnPropertyDescriptors) {
        Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
      } else {
        ownKeys(source).forEach(function (key) {
          Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
        });
      }
    }

    return target;
  }

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v4.3.1): util/index.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */
  var MAX_UID = 1000000;
  var _window = window,
      jQuery = _window.jQuery; // Shoutout AngusCroll (https://goo.gl/pxwQGp)

  var toType = function toType(obj) {
    return {}.toString.call(obj).match(/\s([a-z]+)/i)[1].toLowerCase();
  };
  /**
   * --------------------------------------------------------------------------
   * Public Util Api
   * --------------------------------------------------------------------------
   */


  var getUID = function getUID(prefix) {
    do {
      // eslint-disable-next-line no-bitwise
      prefix += ~~(Math.random() * MAX_UID); // "~~" acts like a faster Math.floor() here
    } while (document.getElementById(prefix));

    return prefix;
  };

  var getSelectorFromElement = function getSelectorFromElement(element) {
    var selector = element.getAttribute('data-target');

    if (!selector || selector === '#') {
      var hrefAttr = element.getAttribute('href');
      selector = hrefAttr && hrefAttr !== '#' ? hrefAttr.trim() : '';
    }

    try {
      return document.querySelector(selector) ? selector : null;
    } catch (error) {
      return null;
    }
  };

  var isElement = function isElement(obj) {
    return (obj[0] || obj).nodeType;
  };

  var typeCheckConfig = function typeCheckConfig(componentName, config, configTypes) {
    Object.keys(configTypes).forEach(function (property) {
      var expectedTypes = configTypes[property];
      var value = config[property];
      var valueType = value && isElement(value) ? 'element' : toType(value);

      if (!new RegExp(expectedTypes).test(valueType)) {
        throw new Error(componentName.toUpperCase() + ": " + ("Option \"" + property + "\" provided type \"" + valueType + "\" ") + ("but expected type \"" + expectedTypes + "\"."));
      }
    });
  };

  var makeArray = function makeArray(nodeList) {
    if (!nodeList) {
      return [];
    }

    return [].slice.call(nodeList);
  };

  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  var NAME = 'scrollspy';
  var VERSION = '4.3.1';
  var DATA_KEY = 'bs.scrollspy';
  var EVENT_KEY = "." + DATA_KEY;
  var DATA_API_KEY = '.data-api';
  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',
    ACTIVE: 'active'
  };
  var 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'
  };
  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 + " ." + ClassName.DROPDOWN_ITEM);
      this._offsets = [];
      this._targets = [];
      this._activeTarget = null;
      this._scrollHeight = 0;
      EventHandler.on(this._scrollElement, Event.SCROLL, function (event) {
        return _this._process(event);
      });
      this.refresh();

      this._process();

      Data.setData(element, DATA_KEY, this);
    } // Getters


    var _proto = ScrollSpy.prototype;

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

      var autoMethod = this._scrollElement === this._scrollElement.window ? OffsetMethod.OFFSET : OffsetMethod.POSITION;
      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(SelectorEngine.find(this._selector));
      targets.map(function (element) {
        var target;
        var targetSelector = getSelectorFromElement(element);

        if (targetSelector) {
          target = SelectorEngine.findOne(targetSelector);
        }

        if (target) {
          var targetBCR = target.getBoundingClientRect();

          if (targetBCR.width || targetBCR.height) {
            return [Manipulator[offsetMethod](target).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() {
      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
    ;

    _proto._getConfig = function _getConfig(config) {
      config = _objectSpread2({}, Default, {}, typeof config === 'object' && config ? config : {});

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

        if (!id) {
          id = getUID(NAME);
          config.target.id = id;
        }

        config.target = "#" + id;
      }

      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;
      }

      var offsetLength = this._offsets.length;

      for (var i = offsetLength; 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(',').map(function (selector) {
        return selector + "[data-target=\"" + target + "\"]," + selector + "[href=\"" + target + "\"]";
      });

      var 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(function (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(function (item) {
            return item.classList.add(ClassName.ACTIVE);
          }); // Handle special case when .nav-link is inside .nav-item

          SelectorEngine.prev(listGroup, Selector.NAV_ITEMS).forEach(function (navItem) {
            SelectorEngine.children(navItem, Selector.NAV_LINKS).forEach(function (item) {
              return item.classList.add(ClassName.ACTIVE);
            });
          });
        });
      }

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

    _proto._clear = function _clear() {
      makeArray(SelectorEngine.find(this._selector)).filter(function (node) {
        return node.classList.contains(ClassName.ACTIVE);
      }).forEach(function (node) {
        return node.classList.remove(ClassName.ACTIVE);
      });
    } // Static
    ;

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

        var _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]();
        }
      });
    };

    ScrollSpy._getInstance = function _getInstance(element) {
      return Data.getData(element, DATA_KEY);
    };

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

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


  EventHandler.on(window, Event.LOAD_DATA_API, function () {
    makeArray(SelectorEngine.find(Selector.DATA_SPY)).forEach(function (spy) {
      return new ScrollSpy(spy, Manipulator.getDataAttributes(spy));
    });
  });
  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   */

  /* istanbul ignore if */

  if (typeof jQuery !== 'undefined') {
    var JQUERY_NO_CONFLICT = jQuery.fn[NAME];
    jQuery.fn[NAME] = ScrollSpy._jQueryInterface;
    jQuery.fn[NAME].Constructor = ScrollSpy;

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

  return ScrollSpy;

}));
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