aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/twbs/bootstrap/js/dist/scrollspy.js
blob: 5dc5110753af1e3ec01bfcc42ad00443817ccfc7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
/*!
  * Bootstrap scrollspy.js v5.2.2 (https://getbootstrap.com/)
  * Copyright 2011-2022 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('./util/index'), require('./dom/event-handler'), require('./dom/selector-engine'), require('./base-component')) :
  typeof define === 'function' && define.amd ? define(['./util/index', './dom/event-handler', './dom/selector-engine', './base-component'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Scrollspy = factory(global.Index, global.EventHandler, global.SelectorEngine, global.BaseComponent));
})(this, (function (index, EventHandler, SelectorEngine, BaseComponent) { 'use strict';

  const _interopDefaultLegacy = e => e && typeof e === 'object' && 'default' in e ? e : { default: e };

  const EventHandler__default = /*#__PURE__*/_interopDefaultLegacy(EventHandler);
  const SelectorEngine__default = /*#__PURE__*/_interopDefaultLegacy(SelectorEngine);
  const BaseComponent__default = /*#__PURE__*/_interopDefaultLegacy(BaseComponent);

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.2.2): scrollspy.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
   * --------------------------------------------------------------------------
   */
  /**
   * Constants
   */

  const NAME = 'scrollspy';
  const DATA_KEY = 'bs.scrollspy';
  const EVENT_KEY = `.${DATA_KEY}`;
  const DATA_API_KEY = '.data-api';
  const EVENT_ACTIVATE = `activate${EVENT_KEY}`;
  const EVENT_CLICK = `click${EVENT_KEY}`;
  const EVENT_LOAD_DATA_API = `load${EVENT_KEY}${DATA_API_KEY}`;
  const CLASS_NAME_DROPDOWN_ITEM = 'dropdown-item';
  const CLASS_NAME_ACTIVE = 'active';
  const SELECTOR_DATA_SPY = '[data-bs-spy="scroll"]';
  const SELECTOR_TARGET_LINKS = '[href]';
  const SELECTOR_NAV_LIST_GROUP = '.nav, .list-group';
  const SELECTOR_NAV_LINKS = '.nav-link';
  const SELECTOR_NAV_ITEMS = '.nav-item';
  const SELECTOR_LIST_ITEMS = '.list-group-item';
  const SELECTOR_LINK_ITEMS = `${SELECTOR_NAV_LINKS}, ${SELECTOR_NAV_ITEMS} > ${SELECTOR_NAV_LINKS}, ${SELECTOR_LIST_ITEMS}`;
  const SELECTOR_DROPDOWN = '.dropdown';
  const SELECTOR_DROPDOWN_TOGGLE = '.dropdown-toggle';
  const Default = {
    offset: null,
    // TODO: v6 @deprecated, keep it for backwards compatibility reasons
    rootMargin: '0px 0px -25%',
    smoothScroll: false,
    target: null,
    threshold: [0.1, 0.5, 1]
  };
  const DefaultType = {
    offset: '(number|null)',
    // TODO v6 @deprecated, keep it for backwards compatibility reasons
    rootMargin: 'string',
    smoothScroll: 'boolean',
    target: 'element',
    threshold: 'array'
  };
  /**
   * Class definition
   */

  class ScrollSpy extends BaseComponent__default.default {
    constructor(element, config) {
      super(element, config); // this._element is the observablesContainer and config.target the menu links wrapper

      this._targetLinks = new Map();
      this._observableSections = new Map();
      this._rootElement = getComputedStyle(this._element).overflowY === 'visible' ? null : this._element;
      this._activeTarget = null;
      this._observer = null;
      this._previousScrollData = {
        visibleEntryTop: 0,
        parentScrollTop: 0
      };
      this.refresh(); // initialize
    } // Getters


    static get Default() {
      return Default;
    }

    static get DefaultType() {
      return DefaultType;
    }

    static get NAME() {
      return NAME;
    } // Public


    refresh() {
      this._initializeTargetsAndObservables();

      this._maybeEnableSmoothScroll();

      if (this._observer) {
        this._observer.disconnect();
      } else {
        this._observer = this._getNewObserver();
      }

      for (const section of this._observableSections.values()) {
        this._observer.observe(section);
      }
    }

    dispose() {
      this._observer.disconnect();

      super.dispose();
    } // Private


    _configAfterMerge(config) {
      // TODO: on v6 target should be given explicitly & remove the {target: 'ss-target'} case
      config.target = index.getElement(config.target) || document.body; // TODO: v6 Only for backwards compatibility reasons. Use rootMargin only

      config.rootMargin = config.offset ? `${config.offset}px 0px -30%` : config.rootMargin;

      if (typeof config.threshold === 'string') {
        config.threshold = config.threshold.split(',').map(value => Number.parseFloat(value));
      }

      return config;
    }

    _maybeEnableSmoothScroll() {
      if (!this._config.smoothScroll) {
        return;
      } // unregister any previous listeners


      EventHandler__default.default.off(this._config.target, EVENT_CLICK);
      EventHandler__default.default.on(this._config.target, EVENT_CLICK, SELECTOR_TARGET_LINKS, event => {
        const observableSection = this._observableSections.get(event.target.hash);

        if (observableSection) {
          event.preventDefault();
          const root = this._rootElement || window;
          const height = observableSection.offsetTop - this._element.offsetTop;

          if (root.scrollTo) {
            root.scrollTo({
              top: height,
              behavior: 'smooth'
            });
            return;
          } // Chrome 60 doesn't support `scrollTo`


          root.scrollTop = height;
        }
      });
    }

    _getNewObserver() {
      const options = {
        root: this._rootElement,
        threshold: this._config.threshold,
        rootMargin: this._config.rootMargin
      };
      return new IntersectionObserver(entries => this._observerCallback(entries), options);
    } // The logic of selection


    _observerCallback(entries) {
      const targetElement = entry => this._targetLinks.get(`#${entry.target.id}`);

      const activate = entry => {
        this._previousScrollData.visibleEntryTop = entry.target.offsetTop;

        this._process(targetElement(entry));
      };

      const parentScrollTop = (this._rootElement || document.documentElement).scrollTop;
      const userScrollsDown = parentScrollTop >= this._previousScrollData.parentScrollTop;
      this._previousScrollData.parentScrollTop = parentScrollTop;

      for (const entry of entries) {
        if (!entry.isIntersecting) {
          this._activeTarget = null;

          this._clearActiveClass(targetElement(entry));

          continue;
        }

        const entryIsLowerThanPrevious = entry.target.offsetTop >= this._previousScrollData.visibleEntryTop; // if we are scrolling down, pick the bigger offsetTop

        if (userScrollsDown && entryIsLowerThanPrevious) {
          activate(entry); // if parent isn't scrolled, let's keep the first visible item, breaking the iteration

          if (!parentScrollTop) {
            return;
          }

          continue;
        } // if we are scrolling up, pick the smallest offsetTop


        if (!userScrollsDown && !entryIsLowerThanPrevious) {
          activate(entry);
        }
      }
    }

    _initializeTargetsAndObservables() {
      this._targetLinks = new Map();
      this._observableSections = new Map();
      const targetLinks = SelectorEngine__default.default.find(SELECTOR_TARGET_LINKS, this._config.target);

      for (const anchor of targetLinks) {
        // ensure that the anchor has an id and is not disabled
        if (!anchor.hash || index.isDisabled(anchor)) {
          continue;
        }

        const observableSection = SelectorEngine__default.default.findOne(anchor.hash, this._element); // ensure that the observableSection exists & is visible

        if (index.isVisible(observableSection)) {
          this._targetLinks.set(anchor.hash, anchor);

          this._observableSections.set(anchor.hash, observableSection);
        }
      }
    }

    _process(target) {
      if (this._activeTarget === target) {
        return;
      }

      this._clearActiveClass(this._config.target);

      this._activeTarget = target;
      target.classList.add(CLASS_NAME_ACTIVE);

      this._activateParents(target);

      EventHandler__default.default.trigger(this._element, EVENT_ACTIVATE, {
        relatedTarget: target
      });
    }

    _activateParents(target) {
      // Activate dropdown parents
      if (target.classList.contains(CLASS_NAME_DROPDOWN_ITEM)) {
        SelectorEngine__default.default.findOne(SELECTOR_DROPDOWN_TOGGLE, target.closest(SELECTOR_DROPDOWN)).classList.add(CLASS_NAME_ACTIVE);
        return;
      }

      for (const listGroup of SelectorEngine__default.default.parents(target, SELECTOR_NAV_LIST_GROUP)) {
        // Set triggered links parents as active
        // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor
        for (const item of SelectorEngine__default.default.prev(listGroup, SELECTOR_LINK_ITEMS)) {
          item.classList.add(CLASS_NAME_ACTIVE);
        }
      }
    }

    _clearActiveClass(parent) {
      parent.classList.remove(CLASS_NAME_ACTIVE);
      const activeNodes = SelectorEngine__default.default.find(`${SELECTOR_TARGET_LINKS}.${CLASS_NAME_ACTIVE}`, parent);

      for (const node of activeNodes) {
        node.classList.remove(CLASS_NAME_ACTIVE);
      }
    } // Static


    static jQueryInterface(config) {
      return this.each(function () {
        const data = ScrollSpy.getOrCreateInstance(this, config);

        if (typeof config !== 'string') {
          return;
        }

        if (data[config] === undefined || config.startsWith('_') || config === 'constructor') {
          throw new TypeError(`No method named "${config}"`);
        }

        data[config]();
      });
    }

  }
  /**
   * Data API implementation
   */


  EventHandler__default.default.on(window, EVENT_LOAD_DATA_API, () => {
    for (const spy of SelectorEngine__default.default.find(SELECTOR_DATA_SPY)) {
      ScrollSpy.getOrCreateInstance(spy);
    }
  });
  /**
   * jQuery
   */

  index.defineJQueryPlugin(ScrollSpy);

  return ScrollSpy;

}));
//# sourceMappingURL=scrollspy.js.map