https://extension.org/wp-content/themes/enfold/js/avia-snippet-sticky-header.js?ver=5.7

1(function($)
2{
3    "use strict";
4
5    $( function()
6    {
7		// decreases header size when user scrolls down
8        avia_header_size();
9    });
10
11
12    function av_change_class($element, change_method, class_name)
13	{
14		if($element[0].classList)
15		{
16			if(change_method == "add")
17			{
18				$element[0].classList.add(class_name);
19			}
20			else
21			{
22				$element[0].classList.remove(class_name);
23			}
24		}
25		else
26		{
27			if(change_method == "add")
28			{
29				$element.addClass(class_name);
30			}
31			else
32			{
33				$element.removeClass(class_name);
34			}
35		}
36	}
37
38
39	function avia_header_size()
40	{
41		var win				= $(window),
42			header          = $('.html_header_top.html_header_sticky #header'),
43			unsticktop		= $('.av_header_unstick_top');
44
45		if( ! header.length && ! unsticktop.length )
46		{
47			return;
48		}
49
50		var logo            = $('#header_main .container .logo img, #header_main .container .logo svg, #header_main .container .logo a'),
51			elements        = $('#header_main .container:not(#header_main_alternate>.container), #header_main .main_menu ul:first-child > li > a:not(.avia_mega_div a, #header_main_alternate a), #header_main #menu-item-shop .cart_dropdown_link'),
52			el_height       = $(elements).first().height(),
53			isMobile        = $.avia_utilities.isMobile,
54			scroll_top		= $('#scroll-top-link'),
55			transparent 	= header.is('.av_header_transparency'),
56			shrinking		= header.is('.av_header_shrinking'),
57			shrink_factor	= header.data( 'av_shrink_factor' ),
58			shrink_val		= el_height/2.0,
59			el_shrinked		= el_height/2.0,
60			header_meta		= header.find('#header_meta'),
61			topbar_height	= header_meta.length ? header_meta.outerHeight() : 0,
62
63			set_height = function()
64            {
65				var st = win.scrollTop(),
66					newH = 0,
67					st_real = st;
68
69				if( unsticktop )
70				{
71					st -= topbar_height;
72				}
73
74				if( st < 0 )
75				{
76					st = 0;
77				}
78
79				if( shrinking && ! isMobile )
80				{
81					if( st < shrink_val )
82					{
83						newH = el_height - st;
84						if( st <= 0 )
85						{
86							newH = el_height;
87						}
88
89						av_change_class( header, 'remove', 'header-scrolled' );
90						//header.removeClass('header-scrolled');
91					}
92					else
93					{
94						newH = el_shrinked;
95						//header.addClass('header-scrolled');
96						av_change_class( header, 'add', 'header-scrolled' );
97					}
98
99					if( st - 30 < el_height )
100					{
101						av_change_class( header, 'remove', 'header-scrolled-full' );
102					}
103					else
104					{
105						av_change_class( header, 'add', 'header-scrolled-full' );
106					}
107
108					elements.css({'height': newH + 'px', 'lineHeight': newH + 'px'});
109					logo.css({'maxHeight': newH + 'px'});
110				}
111
112				if( unsticktop.length )
113				{
114					if( st <= 0 )
115					{
116						if( st_real <= 0 )
117						{
118							st_real = 0;
119						}
120
121						unsticktop.css({"margin-top":"-"+st_real+"px"});
122					}
123					else
124					{
125						unsticktop.css({"margin-top":"-"+topbar_height+"px"});
126					}
127				}
128
129				if( transparent )
130				{
131					if( st > 50 )
132					{
133						//header.removeClass('av_header_transparency');
134						av_change_class( header, 'remove', 'av_header_transparency' );
135					}
136					else
137					{
138						//header.addClass('av_header_transparency');
139						av_change_class( header, 'add', 'av_header_transparency' );
140					}
141				}
142            };
143
144		if( typeof shrink_factor != 'undefined' )
145		{
146			const value = parseInt( shrink_factor );
147			if( ! isNaN( value ) )
148			{
149				shrink_val = el_height * ( value / 100.0 );
150				el_shrinked = el_height - shrink_val;
151			}
152		}
153
154		if( $('body').is( '.avia_deactivate_menu_resize' ) )
155		{
156			shrinking = false;
157		}
158
159		if( ! transparent && ! shrinking && ! unsticktop.length )
160		{
161			return;
162		}
163
164		win.on( 'debouncedresize',  function()
165		{
166			el_height = $( elements ).attr( 'style',"" ).first().height();
167			set_height();
168		});
169
170		win.on( 'scroll',  function()
171		{
172			window.requestAnimationFrame( set_height );
173		});
174
175		set_height();
176    }
177
178})(jQuery);