https://www.christmasvalley.it/nadelurtijei/js/scrollmenu.js

1$(function() {
2
3    // Hide Header on on scroll down
4    var didScroll;
5    var lastScrollTop = 0;
6    var delta = 1;
7    var navbarHeight = $('.header-section').outerHeight();
8    
9    $(window).scroll(function(event){
10        didScroll = true;
11    });
12    
13    setInterval(function() {
14        if (didScroll) {
15            hasScrolled();
16            didScroll = false;
17        }
18    }, 250);
19    
20    function hasScrolled() {
21        var st = $(this).scrollTop();
22        
23        // Make sure they scroll more than delta
24        if(Math.abs(lastScrollTop - st) <= delta)
25            return;
26        
27        // If they scrolled down and are past the navbar, add class .nav-up.
28        // This is necessary so you never see what is "behind" the navbar.
29        if (st > lastScrollTop && st > navbarHeight){
30            // Scroll Down
31            $('.header-section').removeClass('down').addClass('up');
32
33        } else {
34            if(st + $(window).height() < $(document).height()) {
35                $('.header-section').removeClass('up').addClass('down');
36                $('.logo_mobile').removeClass('hide');
37            }
38        }   
39        lastScrollTop = st;
40    }
41    });
42
43    $(function () {
44        // Verifica se il corpo non ha né la classe "contact" né la classe "gallery_page"
45        if (!$('body').hasClass('contact') && !$('body').hasClass('gallery_page')) {
46            $('.header-section').addClass('transparent');
47            $('.nav-bar').addClass('transparent');
48        }
49    });
50