https://cultureandanimals.org/wp-content/themes/Gaea/assets/js/header.js?ver=1.0

1/*!
2 * classie v1.0.0
3 * class helper functions
4 * from bonzo https://github.com/ded/bonzo
5 * MIT license
6 * 
7 * classie.has( elem, 'my-class' ) -> true/false
8 * classie.add( elem, 'my-new-class' )
9 * classie.remove( elem, 'my-unwanted-class' )
10 * classie.toggle( elem, 'my-class' )
11 */
12
13/*jshint browser: true, strict: true, undef: true, unused: true */
14/*global define: false */
15
16( function( window ) {
17
18'use strict';
19
20// class helper functions from bonzo https://github.com/ded/bonzo
21
22function classReg( className ) {
23  return new RegExp("(^|\\s+)" + className + "(\\s+|$)");
24}
25
26// classList support for class management
27// altho to be fair, the api sucks because it won't accept multiple classes at once
28var hasClass, addClass, removeClass;
29
30  hasClass = function( elem, c ) {
31    return classReg( c ).test( elem.className );
32  };
33  addClass = function( elem, c ) {
34    if ( !hasClass( elem, c ) ) {
35      elem.className = elem.className + ' ' + c;
36    }
37  };
38  removeClass = function( elem, c ) {
39    elem.className = elem.className.replace( classReg( c ), ' ' );
40  };
41
42function toggleClass( elem, c ) {
43  var fn = hasClass( elem, c ) ? removeClass : addClass;
44  fn( elem, c );
45}
46
47var classie = {
48  // full names
49  hasClass: hasClass,
50  addClass: addClass,
51  removeClass: removeClass,
52  toggleClass: toggleClass,
53  // short names
54  has: hasClass,
55  add: addClass,
56  remove: removeClass,
57  toggle: toggleClass
58};
59
60// transport
61if ( typeof define === 'function' && define.amd ) {
62  // AMD
63  define( classie );
64} else {
65  // browser global
66  window.classie = classie;
67}
68
69})( window );
70
71function init() {
72    window.addEventListener('scroll', function(e){
73        var distanceY = window.pageYOffset || document.documentElement.scrollTop,
74            shrinkOn = 200,
75            header = document.querySelector(".lower-header");
76        if (distanceY > shrinkOn) {
77            classie.add(header,"sticky-header");
78        } else {
79            if (classie.has(header,"sticky-header")) {
80                classie.remove(header,"sticky-header");
81            }
82        }
83    });
84}
85window.onload = init();