https://danielschwartz.org/wp-content/plugins/taptap-by-bonfire/taptap-smart-scroll.js?ver=1

1// BEGIN SMARTSCROLL (unless menu or search open)
2var didScroll;
3var lastScrollTop = 0;
4var delta = 50;
5var navbarHeight = jQuery('.taptap-menu-button-wrapper, .taptap-search-button-wrapper, .taptap-logo-wrapper, .taptap-header').outerHeight();
6
7jQuery(window).scroll(function(event){
8    didScroll = true;
9});
10
11setInterval(function() {
12    if (didScroll) {
13        hasScrolled();
14        didScroll = false;
15    }
16}, 50);
17
18function hasScrolled() {
19    if(jQuery('.taptap-background-color').hasClass('taptap-background-color-active') || jQuery('.taptap-search-wrapper').hasClass('taptap-search-wrapper-active') ) { } else {        
20        var st = jQuery(this).scrollTop();
21        
22        // Make sure they scroll more than delta
23        if(Math.abs(lastScrollTop - st) <= delta)
24            return;
25        
26        // If they scrolled down and are past the navbar, add class .nav-up.
27        // This is necessary so you never see what is "behind" the navbar.
28        if (st > lastScrollTop && st > navbarHeight){
29            // Scroll Down
30            jQuery('.taptap-menu-button-wrapper, .taptap-search-button-wrapper, .taptap-logo-wrapper, .taptap-header').addClass('taptap-smart-header-hide');
31        } else {
32            // Scroll Up
33            if(st + jQuery(window).height() < jQuery(document).height()) {
34                jQuery('.taptap-menu-button-wrapper, .taptap-search-button-wrapper, .taptap-logo-wrapper, .taptap-header').removeClass('taptap-smart-header-hide');
35            }
36        }
37        
38        lastScrollTop = st;
39    }
40}
41// END SMARTSCROLL (unless menu or search open)