https://owsd.net/modules/custom/owsd_map/js/accordion.js?tlkj5q

1/**
2 * @file
3 * Accordion interactions for OWSD Map sidebar (Drupal 9/10 behavior).
4 *
5 * Converts vanilla handlers to Drupal behaviors with once().
6 * - Click on .accordion-toggle toggles its parent .accordion-item and closes siblings.
7 * - Click on .accordion-subitem marks it as active (single-select within the accordion).
8 * - Adds basic ARIA attributes for accessibility.
9 */
10(function (Drupal, once) {
11  'use strict';
12
13
14  Drupal.behaviors.owsdAccordion = {
15    attach(context) {
16      // For each accordion container, wire events once
17      once('owsd-accordion', '.accordion-item', context).forEach((accordion) => {
18        const accordionItems = document.querySelectorAll(".accordion-item");
19        accordionItems.forEach(item => {
20          const toggle = item.querySelector(".accordion-header.filter-btn");
21
22          if (toggle) {
23            toggle.addEventListener("click", () => {
24              accordionItems.forEach(i => {
25                if (i !== item) i.classList.remove("active");
26              });
27              item.classList.toggle("active");
28            });
29          }
30        });
31      });
32    }
33  };
34
35})(Drupal, once);