https://nccr-robotics.ch/wp-content/themes/engitech/js/header-mobile_ver-20180910.js

1(function($) {
2  "use strict";
3    /* ========================================== 
4	Header Mobile
5	========================================== */
6	// mobile_mainmenu create span
7	$('.collapse .mobile_mainmenu li:has(ul)').prepend('<span class="arrow"><i class="flaticon-right-arrow"></i></span>');
8
9	$( "#mmenu_toggle" ).on('click', function() {
10		$(this).toggleClass( "active" );
11
12		if ($(this).hasClass( "active" )) {
13			$('.mobile_nav').stop(true, true).slideDown();
14		}else{
15			$('.mobile_nav').stop(true, true).slideUp();
16		}		
17	});
18
19	$(".mobile_mainmenu > li span.arrow").click(function() {
20        $(this).parent().find("> ul").stop(true, true).slideToggle()
21        $(this).toggleClass( "active" ); 
22    });
23
24})(jQuery);