https://trainrunlove.nl/wp-content/themes/rundown/script/rundown-script.js?ver=4.0.38

1jQuery(document).ready(function(){ 
2 
3 
4	 // Smooth scroll up
5	 
6        jQuery(window).scroll(function(){
7            if (jQuery(this).scrollTop() > 100) {
8                jQuery('.scrollup').fadeIn();
9            } else {
10                jQuery('.scrollup').fadeOut();
11            }
12        }); 
13 
14        jQuery('.scrollup').click(function(){
15            jQuery("html, body").animate({ scrollTop: 0 }, 600);
16            return false;
17        });
18		
19		
20	 // Dropdown menu in small screen
21	 
22		jQuery("<select />").appendTo("#primarynav,#primarynav-footer"); 
23
24		jQuery("<option />",{ 
25			"selected": "selected", 
26			"value"   : "", 
27			"text"    : "Site Menu" // default <option> to display in dropdown 
28		}).appendTo("#primarynav select,#primarynav-footer select"); 
29
30		jQuery("#primarynav a").each(function() { 
31			var el =  jQuery(this); 
32			jQuery("<option />", { 
33				"value"   : el.attr("href"), 
34				"text"    : el.text() 
35			}).appendTo("#primarynav select,#primarynav-footer select"); 
36		});
37
38		jQuery("#primarynav select,#primarynav-footer select").change(function() { 
39			window.location = jQuery(this).find("option:selected").val(); 
40		}); 		
41 
42});