https://www.easypara.es/static/version1790290112/frontend/Easysoft/easypara/es_ES/js/header.js

1requirejs([
2    'domReady!'
3], function () {
4    'use strict';
5
6    (function(window, document) {
7        var headerTop = 0;
8        var body = document.body;
9    
10        // Calculate top header height to init fixed header
11        var topHeader = document.querySelector('.top-header');
12        var headerHome = document.querySelector('.header-home');
13    
14        if (topHeader) {
15            headerTop += topHeader.offsetHeight;
16        }
17    
18        if (headerHome) {
19            headerTop += headerHome.offsetHeight;
20        }
21    
22        // Fixed header when scrolling down
23        var fixHeader = function() {
24            if (window.scrollY >= headerTop) {
25                body.classList.add('fixed-header');
26            } else {
27                body.classList.remove('fixed-header');
28            }
29        }
30    
31        // Window scroll event
32        window.addEventListener('scroll', function(e) {
33            fixHeader();
34        });
35    
36        fixHeader();    
37    })(window, document);
38});