https://zoomdici.fr/themes/custom/zoomdici/templates/pub/src/js/utils.js?v=1.0.1

1/**
2 * Check if custom class exists.
3 *
4 * @param {HTMLElement} el [dom element]
5 * @param {String} checkClass  [check class, no dot]
6 */
7function hasClass(el, checkClass) {
8    return el.className.match(new RegExp('(\\s|^)' + checkClass + '(\\s|$)'));
9}
10
11/**
12 * Add custom class.
13 *
14 * @param {HTMLElement} el [dom element]
15 * @param {String} newClass [add new class, no dot]
16 */
17function addClass(el, newClass) {
18    if (el.classList) el.classList.add(newClass)
19    else el.className += ' ' + newClass
20}
21
22/**
23 * Remove custom class.
24 *
25 * @param {HTMLElement} el [dom element]
26 * @param {String} classToRemove [remove class, no dot]
27 */
28function removeClass(el, classToRemove) {
29    if (el.classList) el.classList.remove(classToRemove)
30    else {
31        el.className = el.className.replace(new RegExp('(^|\\b)' + classToRemove.split(' ').join('|') + '(\\b|$)', 'gi'), '')
32
33        const posLastCar = el.className.length - 1
34
35        if (el.className[posLastCar] === ' ') el.className = el.className.substring(0, posLastCar)
36    }
37
38    // Remove class attribute if no classes left
39    if (el.classList.length === 0) el.removeAttribute('class')
40}