https://hotelmaltezos.com/app/themes/hotel-apts/assets/js/sticky_header.js?ver=1.8

1var body = document.body;
2var mtv_header_scroll = 0;
3var scrollUp = "mtv-scrolling-up";
4var scrollDown = "mtv-scrolling-down";
5var lastScroll = 0;
6var element = document.getElementById('site-header');
7var height = element.clientHeight;
8var headerTransparency = document.body.getAttribute('data-transparent');
9if (headerTransparency == 'transparent') {
10    var main_content = document.getElementById('content');
11    main_content.style.marginTop = -element.clientHeight + 'px';
12    document.body.style.opacity = 1;
13}
14
15window.addEventListener("scroll", () => {
16        clearTimeout(mtv_header_scroll);
17        mtv_header_scroll = setTimeout(mtv_sticky_header(), 300);
18});
19
20function mtv_sticky_header() {
21    var scrollDistanceFromBottom = document.body.offsetHeight - (window.pageYOffset + window.innerHeight);
22    var currentScroll = window.pageYOffset;
23    if (currentScroll <= height) {
24        body.classList.remove(scrollUp);
25        body.classList.remove(scrollDown);
26        document.body.style.marginTop = '0px';
27        return;
28    }
29
30    if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight) {
31        body.classList.remove(scrollUp);
32        body.classList.add(scrollDown);
33        document.body.style.marginTop = '0px';
34        return;
35    }
36
37
38    if (currentScroll > lastScroll && !body.classList.contains(scrollDown)) {
39        // down
40        body.classList.remove(scrollUp);
41        body.classList.add(scrollDown);
42        document.body.style.marginTop = '0px';
43
44    } else if (
45        currentScroll < lastScroll &&
46        body.classList.contains(scrollDown)
47    ) {
48        // up
49        if (scrollDistanceFromBottom > 200) {
50            body.classList.remove(scrollDown);
51            body.classList.add(scrollUp);
52            document.body.style.marginTop = height + 'px';
53        }
54    }
55
56    lastScroll = currentScroll;
57}