https://www.a2a.it/magazine/themes/custom/gavias_remito/js/menu-sticky.js?v=10.6.11

1(function ($) {
2    'use strict';
3    Drupal.behaviors.menuSticky = {
4        attach: function (context, settings) {
5            // Hide Header on on scroll down
6            let didScroll;
7            let lastScrollTop = 0;
8            let delta = 5;
9            const navbarHeight = $('header').outerHeight();
10            let offsetSticky = navbarHeight + 10;
11
12            $(window).scroll(function (event) {
13                didScroll = true;
14            });
15
16            setInterval(function () {
17                if (didScroll) {
18                    hasScrolled();
19                    didScroll = false;
20                }
21            }, 250);
22
23            function hasScrolled() {
24                let st = $(window).scrollTop();
25
26                // Make sure they scroll more than delta
27                if (Math.abs(lastScrollTop - st) <= delta)
28                    return;
29
30                // If they scrolled down and are past the navbar, add class .stuck.
31                // This is necessary so you never see what is "behind" the navbar.
32                if (st > lastScrollTop && st > navbarHeight) {
33                    // Scroll Down
34                    $('.gv-sticky-menu').removeClass('stuck');
35                } else {
36                    // Scroll Up
37                    if (st + $(window).height() < $(document).height()) {
38                        $('.gv-sticky-menu').addClass('stuck');
39                    }
40
41                    if (st <= offsetSticky) {
42                        $('.gv-sticky-menu').removeClass('stuck');
43                    }
44                }
45
46                lastScrollTop = st;
47            }
48
49        }
50    }
51})(jQuery);