https://leafletjs.com/docs/js/reference.js

1if (document.body.className.indexOf('api-page') !== -1) {
2
3	let elems = document.querySelectorAll('h2, h3, h4, tr');
4
5	for (let i = 0, len = elems.length; i < len; i++) {
6		const el = elems[i];
7
8		if (el.id) {
9			const anchor = document.createElement('a');
10			anchor.setAttribute('data-anchor', el.id);
11			if (!el.children.length) {
12				// For headers, insert the anchor before.
13				el.parentNode.insertBefore(anchor, el);
14
15				// Clicking on the row (meaning "the link icon on the ::before)
16				// jumps to the item
17				el.onclick = function () {
18					return function (ev) {
19						if (ev.offsetX < 0) {
20							window.location.hash = `#${ev.target.id}`;
21						}
22					};
23				}(el.id);
24			} else {
25				// For table rows, insert the anchor inside the first <td>
26				el.querySelector('td').appendChild(anchor);
27
28				// Clicking on the row (meaning "the link icon on the ::before)
29				// jumps to the item
30				el.parentNode.onclick = function () {
31					return function (ev) {
32						if (ev.offsetX < 0) {
33							window.location.hash = `#${ev.target.parentNode.id}`;
34						}
35					};
36				}(el.id);
37			}
38		}
39	}
40
41	elems = document.querySelectorAll('div.accordion');
42	for (let i = 0, len = elems.length; i < len; i++) {
43		const el = elems[i];
44
45		el.querySelector('label').addEventListener('click', function (c) {
46			return function () {
47				if (c.className === 'accordion expanded') {
48					c.className = 'accordion collapsed';
49				} else {
50					c.className = 'accordion expanded';
51				}
52			};
53		}(el));
54
55		// 		el.className = 'accordion collapsed';
56		// 		el.querySelector('.accordion-content').style.display = 'none';
57	}
58
59
60	// open accordion of anchor if collapsed
61	const urlAnchor = location.hash;
62	if (urlAnchor) {
63		const fnc = function () {
64			// timeout because the page is not finished loading with collapsed accordions
65			setTimeout(() => {
66				// .closest('.accordion') would be a alternative but is not working in IE
67				const getParentAccordion = function (el) {
68					while (el.parentNode && (` ${el.parentNode.className} `).indexOf(' accordion ') === -1) {
69						el = el.parentNode;
70					}
71					return el.parentNode && (` ${el.parentNode.className} `).indexOf(' accordion ') > -1 ? el.parentNode : null;
72				};
73
74				const elm = document.getElementById(urlAnchor.substring(1));
75				if (elm) {
76					const parent = getParentAccordion(elm);
77					if (parent) {
78						parent.className = 'accordion expanded';
79					}
80					// For Firefox: Accordion have to be expanded before scrolling
81					setTimeout(() => {
82						elm.scrollIntoView();
83					}, 10);
84				}
85			}, 100);
86		};
87		window.addEventListener('load', fnc);
88	}
89}