mirror of
https://github.com/twbs/bootstrap.git
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313 lines
10 KiB
JavaScript
313 lines
10 KiB
JavaScript
/*!
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* Bootstrap scrollspy.js v5.2.1 (https://getbootstrap.com/)
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* Copyright 2011-2022 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
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* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
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*/
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('./util/index'), require('./dom/event-handler'), require('./dom/selector-engine'), require('./base-component')) :
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typeof define === 'function' && define.amd ? define(['./util/index', './dom/event-handler', './dom/selector-engine', './base-component'], factory) :
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(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Scrollspy = factory(global.Index, global.EventHandler, global.SelectorEngine, global.BaseComponent));
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})(this, (function (index, EventHandler, SelectorEngine, BaseComponent) { 'use strict';
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const _interopDefaultLegacy = e => e && typeof e === 'object' && 'default' in e ? e : { default: e };
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const EventHandler__default = /*#__PURE__*/_interopDefaultLegacy(EventHandler);
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const SelectorEngine__default = /*#__PURE__*/_interopDefaultLegacy(SelectorEngine);
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const BaseComponent__default = /*#__PURE__*/_interopDefaultLegacy(BaseComponent);
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/**
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* --------------------------------------------------------------------------
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* Bootstrap (v5.2.1): scrollspy.js
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* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
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* --------------------------------------------------------------------------
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*/
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/**
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* Constants
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*/
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const NAME = 'scrollspy';
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const DATA_KEY = 'bs.scrollspy';
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const EVENT_KEY = `.${DATA_KEY}`;
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const DATA_API_KEY = '.data-api';
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const EVENT_ACTIVATE = `activate${EVENT_KEY}`;
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const EVENT_CLICK = `click${EVENT_KEY}`;
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const EVENT_LOAD_DATA_API = `load${EVENT_KEY}${DATA_API_KEY}`;
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const CLASS_NAME_DROPDOWN_ITEM = 'dropdown-item';
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const CLASS_NAME_ACTIVE = 'active';
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const SELECTOR_DATA_SPY = '[data-bs-spy="scroll"]';
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const SELECTOR_TARGET_LINKS = '[href]';
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const SELECTOR_NAV_LIST_GROUP = '.nav, .list-group';
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const SELECTOR_NAV_LINKS = '.nav-link';
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const SELECTOR_NAV_ITEMS = '.nav-item';
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const SELECTOR_LIST_ITEMS = '.list-group-item';
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const SELECTOR_LINK_ITEMS = `${SELECTOR_NAV_LINKS}, ${SELECTOR_NAV_ITEMS} > ${SELECTOR_NAV_LINKS}, ${SELECTOR_LIST_ITEMS}`;
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const SELECTOR_DROPDOWN = '.dropdown';
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const SELECTOR_DROPDOWN_TOGGLE = '.dropdown-toggle';
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const Default = {
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offset: null,
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// TODO: v6 @deprecated, keep it for backwards compatibility reasons
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rootMargin: '0px 0px -25%',
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smoothScroll: false,
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target: null,
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threshold: [0.1, 0.5, 1]
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};
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const DefaultType = {
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offset: '(number|null)',
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// TODO v6 @deprecated, keep it for backwards compatibility reasons
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rootMargin: 'string',
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smoothScroll: 'boolean',
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target: 'element',
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threshold: 'array'
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};
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/**
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* Class definition
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*/
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class ScrollSpy extends BaseComponent__default.default {
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constructor(element, config) {
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super(element, config); // this._element is the observablesContainer and config.target the menu links wrapper
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this._targetLinks = new Map();
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this._observableSections = new Map();
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this._rootElement = getComputedStyle(this._element).overflowY === 'visible' ? null : this._element;
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this._activeTarget = null;
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this._observer = null;
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this._previousScrollData = {
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visibleEntryTop: 0,
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parentScrollTop: 0
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};
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this.refresh(); // initialize
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} // Getters
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static get Default() {
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return Default;
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}
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static get DefaultType() {
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return DefaultType;
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}
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static get NAME() {
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return NAME;
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} // Public
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refresh() {
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this._initializeTargetsAndObservables();
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this._maybeEnableSmoothScroll();
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if (this._observer) {
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this._observer.disconnect();
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} else {
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this._observer = this._getNewObserver();
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}
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for (const section of this._observableSections.values()) {
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this._observer.observe(section);
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}
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}
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dispose() {
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this._observer.disconnect();
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super.dispose();
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} // Private
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_configAfterMerge(config) {
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// TODO: on v6 target should be given explicitly & remove the {target: 'ss-target'} case
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config.target = index.getElement(config.target) || document.body; // TODO: v6 Only for backwards compatibility reasons. Use rootMargin only
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config.rootMargin = config.offset ? `${config.offset}px 0px -30%` : config.rootMargin;
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if (typeof config.threshold === 'string') {
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config.threshold = config.threshold.split(',').map(value => Number.parseFloat(value));
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}
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return config;
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}
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_maybeEnableSmoothScroll() {
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if (!this._config.smoothScroll) {
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return;
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} // unregister any previous listeners
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EventHandler__default.default.off(this._config.target, EVENT_CLICK);
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EventHandler__default.default.on(this._config.target, EVENT_CLICK, SELECTOR_TARGET_LINKS, event => {
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const observableSection = this._observableSections.get(event.target.hash);
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if (observableSection) {
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event.preventDefault();
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const root = this._rootElement || window;
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const height = observableSection.offsetTop - this._element.offsetTop;
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if (root.scrollTo) {
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root.scrollTo({
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top: height,
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behavior: 'smooth'
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});
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return;
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} // Chrome 60 doesn't support `scrollTo`
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root.scrollTop = height;
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}
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});
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}
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_getNewObserver() {
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const options = {
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root: this._rootElement,
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threshold: this._config.threshold,
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rootMargin: this._config.rootMargin
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};
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return new IntersectionObserver(entries => this._observerCallback(entries), options);
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} // The logic of selection
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_observerCallback(entries) {
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const targetElement = entry => this._targetLinks.get(`#${entry.target.id}`);
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const activate = entry => {
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this._previousScrollData.visibleEntryTop = entry.target.offsetTop;
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this._process(targetElement(entry));
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};
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const parentScrollTop = (this._rootElement || document.documentElement).scrollTop;
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const userScrollsDown = parentScrollTop >= this._previousScrollData.parentScrollTop;
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this._previousScrollData.parentScrollTop = parentScrollTop;
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for (const entry of entries) {
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if (!entry.isIntersecting) {
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this._activeTarget = null;
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this._clearActiveClass(targetElement(entry));
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continue;
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}
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const entryIsLowerThanPrevious = entry.target.offsetTop >= this._previousScrollData.visibleEntryTop; // if we are scrolling down, pick the bigger offsetTop
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if (userScrollsDown && entryIsLowerThanPrevious) {
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activate(entry); // if parent isn't scrolled, let's keep the first visible item, breaking the iteration
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if (!parentScrollTop) {
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return;
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}
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continue;
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} // if we are scrolling up, pick the smallest offsetTop
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if (!userScrollsDown && !entryIsLowerThanPrevious) {
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activate(entry);
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}
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}
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}
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_initializeTargetsAndObservables() {
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this._targetLinks = new Map();
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this._observableSections = new Map();
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const targetLinks = SelectorEngine__default.default.find(SELECTOR_TARGET_LINKS, this._config.target);
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for (const anchor of targetLinks) {
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// ensure that the anchor has an id and is not disabled
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if (!anchor.hash || index.isDisabled(anchor)) {
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continue;
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}
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const observableSection = SelectorEngine__default.default.findOne(anchor.hash, this._element); // ensure that the observableSection exists & is visible
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if (index.isVisible(observableSection)) {
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this._targetLinks.set(anchor.hash, anchor);
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this._observableSections.set(anchor.hash, observableSection);
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}
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}
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}
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_process(target) {
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if (this._activeTarget === target) {
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return;
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}
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this._clearActiveClass(this._config.target);
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this._activeTarget = target;
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target.classList.add(CLASS_NAME_ACTIVE);
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this._activateParents(target);
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EventHandler__default.default.trigger(this._element, EVENT_ACTIVATE, {
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relatedTarget: target
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});
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}
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_activateParents(target) {
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// Activate dropdown parents
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if (target.classList.contains(CLASS_NAME_DROPDOWN_ITEM)) {
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SelectorEngine__default.default.findOne(SELECTOR_DROPDOWN_TOGGLE, target.closest(SELECTOR_DROPDOWN)).classList.add(CLASS_NAME_ACTIVE);
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return;
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}
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for (const listGroup of SelectorEngine__default.default.parents(target, SELECTOR_NAV_LIST_GROUP)) {
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// Set triggered links parents as active
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// With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor
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for (const item of SelectorEngine__default.default.prev(listGroup, SELECTOR_LINK_ITEMS)) {
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item.classList.add(CLASS_NAME_ACTIVE);
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}
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}
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}
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_clearActiveClass(parent) {
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parent.classList.remove(CLASS_NAME_ACTIVE);
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const activeNodes = SelectorEngine__default.default.find(`${SELECTOR_TARGET_LINKS}.${CLASS_NAME_ACTIVE}`, parent);
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for (const node of activeNodes) {
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node.classList.remove(CLASS_NAME_ACTIVE);
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}
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} // Static
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static jQueryInterface(config) {
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return this.each(function () {
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const data = ScrollSpy.getOrCreateInstance(this, config);
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if (typeof config !== 'string') {
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return;
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}
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if (data[config] === undefined || config.startsWith('_') || config === 'constructor') {
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throw new TypeError(`No method named "${config}"`);
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}
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data[config]();
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});
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}
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}
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/**
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* Data API implementation
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*/
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EventHandler__default.default.on(window, EVENT_LOAD_DATA_API, () => {
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for (const spy of SelectorEngine__default.default.find(SELECTOR_DATA_SPY)) {
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ScrollSpy.getOrCreateInstance(spy);
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}
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});
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/**
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* jQuery
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*/
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index.defineJQueryPlugin(ScrollSpy);
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return ScrollSpy;
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}));
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//# sourceMappingURL=scrollspy.js.map
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