https://plazi.org/js/menu.js

1'use strict';
2
3(function iifeMenu(document, window, undefined) {
4	var menuBtn = document.querySelector('.menu__btn');
5	var	menu = document.querySelector('.menu__list');
6
7	function toggleMenu() {
8		menu.classList.toggle('menu__list--active');
9		menu.classList.toggle('menu__list--transition');
10		this.classList.toggle('menu__btn--active');
11		this.setAttribute(
12			'aria-expanded',
13			this.getAttribute('aria-expanded') === 'true' ? 'false' : 'true'
14		);
15	}
16
17	function removeMenuTransition() {
18		this.classList.remove('menu__list--transition');
19	}
20
21	if (menuBtn && menu) {
22		menuBtn.addEventListener('click', toggleMenu, false);
23		menu.addEventListener('transitionend', removeMenuTransition, false);
24	}
25}(document, window));