https://heathmanhotel.com/content/themes/base/assets/js/header.js?ver=7.1

1$(function(){
2
3	stickyNavSetup();
4	hideNav();
5});
6
7
8function stickyNavSetup() {
9
10  // sticky nav
11  const sentinelEl = document.getElementById('sentinel')
12  const headerEl   = document.getElementById('header')
13  const stuckClass = "stuck"
14
15  const handler = (entries) => {
16    if (headerEl) {
17      if (!entries[0].isIntersecting) {
18        headerEl.classList.add(stuckClass)
19      } else {
20        headerEl.classList.remove(stuckClass)
21      }
22    }
23  }
24
25  const observer = new window.IntersectionObserver(handler)
26  observer.observe(sentinelEl)
27}
28
29
30function hideNav(){
31	// Hide Header on on scroll down
32	var didScroll;
33	var lastScrollTop = 0;
34	var delta = 5;
35	var navbarHeight = $('header').outerHeight();
36
37	$(window).scroll(function(event){
38	    didScroll = true;
39	});
40
41	setInterval(function() {
42	    if (didScroll) {
43	        hasScrolled();
44	        didScroll = false;
45	    }
46	}, 250);
47
48	function hasScrolled() {
49	    var st = $(this).scrollTop();
50	    
51	    // Make sure they scroll more than delta
52	    if(Math.abs(lastScrollTop - st) <= delta)
53	        return;
54	    
55	    // If they scrolled down and are past the navbar, add class .nav-up.
56	    // This is necessary so you never see what is "behind" the navbar.
57	    if (st > lastScrollTop && st > navbarHeight){
58        // Scroll Down
59        $('header').removeClass('nav-down').addClass('nav-up');
60	      $('.js-megamenu').attr('data-expanded', 'false');
61	      $('.js-mm-trigger').attr('data-expanded', 'false').attr('aria-expanded', 'false');
62
63	    } else {
64        // Scroll Up
65        if(st + $(window).height() < $(document).height()) {
66          $('header').removeClass('nav-up').addClass('nav-down');
67        }
68	    }
69	    
70	    lastScrollTop = st;
71	}
72}