https://assets.oviahealth.com/wp-content/themes/ovia/js/navigation.js?ver=2.0.1

1/**
2 * File navigation.js.
3 *
4 * Handles toggling the navigation menu for small screens and enables TAB key
5 * navigation support for dropdown menus.
6 */
7( function() {
8    const siteNavigation = document.getElementById( 'site-navigation' );
9
10    // Return early if the navigation don't exist.
11    if ( ! siteNavigation ) {
12        return;
13    }
14
15    const button = siteNavigation.getElementsByTagName( 'button' )[ 0 ];
16
17    // Return early if the button don't exist.
18    if ( 'undefined' === typeof button ) {
19        return;
20    }
21
22    const menu = siteNavigation.getElementsByTagName( 'ul' )[ 0 ];
23
24    // Hide menu toggle button if menu is empty and return early.
25    if ( 'undefined' === typeof menu ) {
26        button.style.display = 'none';
27        return;
28    }
29
30    if ( ! menu.classList.contains( 'nav-menu' ) ) {
31        menu.classList.add( 'nav-menu' );
32    }
33
34    // Toggle the .toggled class and the aria-expanded value each time the button is clicked.
35    button.addEventListener( 'click', function() {
36        siteNavigation.classList.toggle( 'toggled' );
37
38        if ( button.getAttribute( 'aria-expanded' ) === 'true' ) {
39            button.setAttribute( 'aria-expanded', 'false' );
40        } else {
41            button.setAttribute( 'aria-expanded', 'true' );
42        }
43    } );
44
45    // Remove the .toggled class and set aria-expanded to false when the user clicks outside the navigation.
46    document.addEventListener( 'click', function( event ) {
47        const isClickInside = siteNavigation.contains( event.target );
48
49        if ( ! isClickInside ) {
50            siteNavigation.classList.remove( 'toggled' );
51            button.setAttribute( 'aria-expanded', 'false' );
52        }
53    } );
54
55    // Get all the link elements within the menu.
56    const links = menu.getElementsByTagName( 'a' );
57
58    // Get all the link elements with children within the menu.
59    const linksWithChildren = menu.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
60
61    // Toggle focus each time a menu link is focused or blurred.
62    for ( const link of links ) {
63        link.addEventListener( 'focus', toggleFocus, true );
64        link.addEventListener( 'blur', toggleFocus, true );
65    }
66
67    // Toggle focus each time a menu link with children receive a touch event.
68    for ( const link of linksWithChildren ) {
69        link.addEventListener( 'touchstart', toggleFocus, false );
70    }
71
72    /**
73     * Sets or removes .focus class on an element.
74     */
75    function toggleFocus() {
76        if ( event.type === 'focus' || event.type === 'blur' ) {
77            let self = this;
78            // Move up through the ancestors of the current link until we hit .nav-menu.
79            while ( ! self.classList.contains( 'nav-menu' ) ) {
80                // On li elements toggle the class .focus.
81                if ( 'li' === self.tagName.toLowerCase() ) {
82                    self.classList.toggle( 'focus' );
83                }
84                self = self.parentNode;
85            }
86        }
87
88        if ( event.type === 'touchstart' ) {
89            const menuItem = this.parentNode;
90            event.preventDefault();
91            for ( const link of menuItem.parentNode.children ) {
92                if ( menuItem !== link ) {
93                    link.classList.remove( 'focus' );
94                }
95            }
96            menuItem.classList.toggle( 'focus' );
97        }
98    }
99}() );