https://sabinesalk.de/wp-content/plugins/twentig/dist/js/classic/twentig-twentytwentyone.js?ver=1.0

1(function() {
2
3	/**
4	 * hasClass utility
5	 */
6	function hasClass(el, cls) {
7		if ( el.classList.contains( cls ) ){
8			return true;
9		}
10		return false;
11	}
12
13	/**
14	 * Throttle function
15	 * Underscore.js 1.10.2 https://underscorejs.org
16	 * (c) 2009-2020 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
17	 * Underscore may be freely distributed under the MIT license.
18	 */
19	function throttle(func, wait, options) {
20		var now = Date.now || function() {
21			return new Date().getTime();
22		};
23		var timeout, context, args, result;
24		var previous = 0;
25		if (!options) options = {};
26		var later = function() {
27			previous = options.leading === false ? 0 : now();
28			timeout = null;
29			result = func.apply(context, args);
30			if (!timeout) context = args = null;
31		};
32		var throttled = function() {
33			var _now = now();
34			if (!previous && options.leading === false) previous = _now;
35			var remaining = wait - (_now - previous);
36			context = this;
37			args = arguments;
38			if (remaining <= 0 || remaining > wait) {
39				if (timeout) {
40					clearTimeout(timeout);
41					timeout = null;
42				}
43				previous = _now;
44				result = func.apply(context, args);
45				if (!timeout) context = args = null;
46			} else if (!timeout && options.trailing !== false) {
47				timeout = setTimeout(later, remaining);
48			}
49			return result;
50		};
51		return throttled;
52	}
53
54	/**
55	 * Runs the burger menu and sticky header functions as soon as the document is `ready`
56	 */
57	document.addEventListener( 'DOMContentLoaded', function() {
58		var header = document.querySelector( '#masthead' );
59		if ( header != null && hasClass( document.body, 'tw-header-sticky' ) ) {
60			if ( hasClass( document.body, 'tw-header-light' ) || hasClass( document.body, 'page-template-tw-header-transparent' ) ) {
61				var scrollTop = window.pageYOffset;
62				if ( scrollTop > 30 ) {
63					document.body.classList.add( 'tw-header-opaque' );
64				}
65				window.addEventListener( 'scroll', throttle( function() {
66					var scrollTop = window.pageYOffset;
67					if ( scrollTop > 30 ) {
68						document.body.classList.add( 'tw-header-opaque' );
69					} else {
70						document.body.classList.remove( 'tw-header-opaque' );
71					}
72				}, 100 ) );
73			}
74		}
75	});
76})();