https://www.fairfaxcounty.gov/resources/public/wcm17/js/application.js

1(function ($) {
2    'use strict';
3    // auto hide top nav on scroll via bootstrap-autohidingnavbar plugin
4    function hideDetect() {
5        $("div.jumbotron-header").autoHidingNavbar();
6        if ($(window).width() > 1100) {
7            // Keep menu on big screens
8            $('div.jumbotron-header').autoHidingNavbar('setDisableAutohide', true);
9            $("div.jumbotron-header").autoHidingNavbar('show');
10        } else {
11            // Auto-hide menu on tiny screens
12            $('div.jumbotron-header').autoHidingNavbar('setDisableAutohide', false);
13        }
14    }
15    if (!$.fn.autoHidingNavbar) {
16        $.ajax({
17            url: "https://cdnjs.cloudflare.com/ajax/libs/bootstrap-autohidingnavbar/4.0.0/jquery.bootstrap-autohidingnavbar.min.js",
18            dataType: "script",
19            cache: true,
20            success: function () {
21                // console.log("load bootstrap-autohidingnavbar plugin successfully");
22                $(function () {
23                    // Re-launch dection in window resized
24                    $(window).resize(function () {
25                        hideDetect();
26                    });
27                    //autohide top nav on scroll
28                    hideDetect();
29                });
30            }
31        });
32    } else {
33        $(function () {
34            // Re-launch dection in window resized
35            $(window).resize(function () {
36                hideDetect();
37            });
38            // auto hide top nav on scroll
39            hideDetect();
40        });
41    }
42    $(function () {
43        /* workaround: rollback initial value in custom.css */
44        $('.jumbotron-footer div.panel').attr("style", "max-height: 0px; transition: max-height 0.2s ease-out;");
45
46        $('.jumbotron-footer .accordion').click(function (e) {
47            e.preventDefault(); // need to prevent trigger form postback!
48            e.stopPropagation();
49            $(this).toggleClass('active');
50            $(this).next('.panel').each(function (i, elem) {
51                $(elem).toggleClass('active');
52                if (parseInt(elem.style.maxHeight) !== 0) {
53                    elem.style.maxHeight = 0;
54                } else {
55                    elem.style.maxHeight = elem.scrollHeight + 'px';
56                }
57            });
58        });
59    });
60}(jQuery));