bootstrap-italia/dist/plugins/collapse.js

Bootstrap Italia è un tema Bootstrap 5 per la creazione di applicazioni web nel pieno rispetto delle linee guida di design per i siti internet e i servizi digitali della PA

import { getSelectorFromElement, reflow, getElementFromSelector, getElement } from './util/index.js';
import EventHandler from './dom/event-handler.js';
import SelectorEngine from './dom/selector-engine.js';
import BaseComponent from './base-component.js';

/**
 * --------------------------------------------------------------------------
 * Bootstrap Italia (https://italia.github.io/bootstrap-italia/)
 * Authors: https://github.com/italia/bootstrap-italia/blob/main/AUTHORS
 * Licensed under BSD-3-Clause license (https://github.com/italia/bootstrap-italia/blob/main/LICENSE)
 * This a fork of Bootstrap: Initial license and original file name below
 * Bootstrap (v5.2.3): collapse.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 * --------------------------------------------------------------------------
 */


/**
 * Constants
 */

const NAME = 'collapse';
const DATA_KEY = 'bs.collapse';
const EVENT_KEY = `.${DATA_KEY}`;
const DATA_API_KEY = '.data-api';

const EVENT_SHOW = `show${EVENT_KEY}`;
const EVENT_SHOWN = `shown${EVENT_KEY}`;
const EVENT_HIDE = `hide${EVENT_KEY}`;
const EVENT_HIDDEN = `hidden${EVENT_KEY}`;
const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`;

const CLASS_NAME_SHOW = 'show';
const CLASS_NAME_COLLAPSE = 'collapse';
const CLASS_NAME_COLLAPSING = 'collapsing';
const CLASS_NAME_COLLAPSED = 'collapsed';
const CLASS_NAME_DEEPER_CHILDREN = `:scope .${CLASS_NAME_COLLAPSE} .${CLASS_NAME_COLLAPSE}`;
const CLASS_NAME_HORIZONTAL = 'collapse-horizontal';

const WIDTH = 'width';
const HEIGHT = 'height';

const SELECTOR_ACTIVES = '.collapse.show, .collapse.collapsing';
const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="collapse"]';

const Default = {
  parent: null,
  toggle: true,
};

const DefaultType = {
  parent: '(null|element)',
  toggle: 'boolean',
};

/**
 * Class definition
 */

class Collapse extends BaseComponent {
  constructor(element, config) {
    super(element, config);

    this._isTransitioning = false;
    this._triggerArray = [];

    const toggleList = SelectorEngine.find(SELECTOR_DATA_TOGGLE);

    for (const elem of toggleList) {
      const selector = getSelectorFromElement(elem);
      const filterElement = SelectorEngine.find(selector).filter((foundElement) => foundElement === this._element);

      if (selector !== null && filterElement.length) {
        this._triggerArray.push(elem);
      }
    }

    this._initializeChildren();

    if (!this._config.parent) {
      this._addAriaAndCollapsedClass(this._triggerArray, this._isShown());
    }

    if (this._config.toggle) {
      this.toggle();
    }
  }

  // Getters
  static get Default() {
    return Default
  }

  static get DefaultType() {
    return DefaultType
  }

  static get NAME() {
    return NAME
  }

  // Public
  toggle() {
    if (this._isShown()) {
      this.hide();
    } else {
      this.show();
    }
  }

  show() {
    if (this._isTransitioning || this._isShown()) {
      return
    }

    let activeChildren = [];

    // find active children
    if (this._config.parent) {
      activeChildren = this._getFirstLevelChildren(SELECTOR_ACTIVES)
        .filter((element) => element !== this._element)
        .map((element) => Collapse.getOrCreateInstance(element, { toggle: false }));
    }

    if (activeChildren.length && activeChildren[0]._isTransitioning) {
      return
    }

    const startEvent = EventHandler.trigger(this._element, EVENT_SHOW);
    if (startEvent.defaultPrevented) {
      return
    }

    for (const activeInstance of activeChildren) {
      activeInstance.hide();
    }

    const dimension = this._getDimension();

    this._element.classList.remove(CLASS_NAME_COLLAPSE);
    this._element.classList.add(CLASS_NAME_COLLAPSING);

    this._element.style[dimension] = 0;

    this._addAriaAndCollapsedClass(this._triggerArray, true);
    this._isTransitioning = true;

    const complete = () => {
      this._isTransitioning = false;

      this._element.classList.remove(CLASS_NAME_COLLAPSING);
      this._element.classList.add(CLASS_NAME_COLLAPSE, CLASS_NAME_SHOW);

      this._element.style[dimension] = '';

      EventHandler.trigger(this._element, EVENT_SHOWN);
    };

    const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1);
    const scrollSize = `scroll${capitalizedDimension}`;

    this._queueCallback(complete, this._element, true);
    this._element.style[dimension] = `${this._element[scrollSize]}px`;
  }

  hide() {
    if (this._isTransitioning || !this._isShown()) {
      return
    }

    const startEvent = EventHandler.trigger(this._element, EVENT_HIDE);
    if (startEvent.defaultPrevented) {
      return
    }

    const dimension = this._getDimension();

    this._element.style[dimension] = `${this._element.getBoundingClientRect()[dimension]}px`;

    reflow(this._element);

    this._element.classList.add(CLASS_NAME_COLLAPSING);
    this._element.classList.remove(CLASS_NAME_COLLAPSE, CLASS_NAME_SHOW);

    for (const trigger of this._triggerArray) {
      const element = getElementFromSelector(trigger);

      if (element && !this._isShown(element)) {
        this._addAriaAndCollapsedClass([trigger], false);
      }
    }

    this._isTransitioning = true;

    const complete = () => {
      this._isTransitioning = false;
      this._element.classList.remove(CLASS_NAME_COLLAPSING);
      this._element.classList.add(CLASS_NAME_COLLAPSE);
      EventHandler.trigger(this._element, EVENT_HIDDEN);
    };

    this._element.style[dimension] = '';

    this._queueCallback(complete, this._element, true);
  }

  _isShown(element = this._element) {
    return element.classList.contains(CLASS_NAME_SHOW)
  }

  // Private
  _configAfterMerge(config) {
    config.toggle = Boolean(config.toggle); // Coerce string values
    config.parent = getElement(config.parent);
    return config
  }

  _getDimension() {
    return this._element.classList.contains(CLASS_NAME_HORIZONTAL) ? WIDTH : HEIGHT
  }

  _initializeChildren() {
    if (!this._config.parent) {
      return
    }

    const children = this._getFirstLevelChildren(SELECTOR_DATA_TOGGLE);

    for (const element of children) {
      const selected = getElementFromSelector(element);

      if (selected) {
        this._addAriaAndCollapsedClass([element], this._isShown(selected));
      }
    }
  }

  _getFirstLevelChildren(selector) {
    const children = SelectorEngine.find(CLASS_NAME_DEEPER_CHILDREN, this._config.parent);
    // remove children if greater depth
    return SelectorEngine.find(selector, this._config.parent).filter((element) => !children.includes(element))
  }

  _addAriaAndCollapsedClass(triggerArray, isOpen) {
    if (!triggerArray.length) {
      return
    }

    for (const element of triggerArray) {
      element.classList.toggle(CLASS_NAME_COLLAPSED, !isOpen);
      element.setAttribute('aria-expanded', isOpen);
    }
  }
}

/**
 * Data API implementation
 */

if (typeof window !== 'undefined' && typeof document !== 'undefined') {
  EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {
    // preventDefault only for <a> elements (which change the URL) not inside the collapsible element
    if (event.target.tagName === 'A' || (event.delegateTarget && event.delegateTarget.tagName === 'A')) {
      event.preventDefault();
    }

    const selector = getSelectorFromElement(this);
    const selectorElements = SelectorEngine.find(selector);

    for (const element of selectorElements) {
      Collapse.getOrCreateInstance(element, { toggle: false }).toggle();
    }
  });
}

export { Collapse as default };
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