100 lines
2.9 KiB
JavaScript
100 lines
2.9 KiB
JavaScript
/**
|
|
* File navigation.js.
|
|
*
|
|
* Handles toggling the navigation menu for small screens and enables TAB key
|
|
* navigation support for dropdown menus.
|
|
*/
|
|
( function() {
|
|
const siteNavigation = document.getElementById( 'site-navigation-main' );
|
|
|
|
// Return early if the navigation doesn't exist.
|
|
if ( ! siteNavigation ) {
|
|
return;
|
|
}
|
|
|
|
const button = siteNavigation.getElementsByTagName( 'button' )[ 0 ];
|
|
|
|
// Return early if the button doesn't exist.
|
|
if ( 'undefined' === typeof button ) {
|
|
return;
|
|
}
|
|
|
|
const menu = siteNavigation.getElementsByTagName( 'ul' )[ 0 ];
|
|
|
|
// Hide menu toggle button if menu is empty and return early.
|
|
if ( 'undefined' === typeof menu ) {
|
|
button.style.display = 'none';
|
|
return;
|
|
}
|
|
|
|
if ( ! menu.classList.contains( 'nav-menu' ) ) {
|
|
menu.classList.add( 'nav-menu' );
|
|
}
|
|
|
|
// Toggle the .toggled class and the aria-expanded value each time the button is clicked.
|
|
button.addEventListener( 'click', function() {
|
|
siteNavigation.classList.toggle( 'toggled' );
|
|
|
|
if ( button.getAttribute( 'aria-expanded' ) === 'true' ) {
|
|
button.setAttribute( 'aria-expanded', 'false' );
|
|
} else {
|
|
button.setAttribute( 'aria-expanded', 'true' );
|
|
}
|
|
} );
|
|
|
|
// Remove the .toggled class and set aria-expanded to false when the user clicks outside the navigation.
|
|
document.addEventListener( 'click', function( event ) {
|
|
const isClickInside = siteNavigation.contains( event.target );
|
|
|
|
if ( ! isClickInside ) {
|
|
siteNavigation.classList.remove( 'toggled' );
|
|
button.setAttribute( 'aria-expanded', 'false' );
|
|
}
|
|
} );
|
|
|
|
// Get all the link elements within the menu.
|
|
const links = menu.getElementsByTagName( 'a' );
|
|
|
|
// Get all the link elements with children within the menu.
|
|
const linksWithChildren = menu.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
|
|
|
|
// Toggle focus each time a menu link is focused or blurred.
|
|
for ( const link of links ) {
|
|
link.addEventListener( 'focus', toggleFocus, true );
|
|
link.addEventListener( 'blur', toggleFocus, true );
|
|
}
|
|
|
|
// Toggle focus each time a menu link with children receive a touch event.
|
|
for ( const link of linksWithChildren ) {
|
|
link.addEventListener( 'touchstart', toggleFocus, false );
|
|
}
|
|
|
|
/**
|
|
* Sets or removes .focus class on an element.
|
|
*/
|
|
function toggleFocus() {
|
|
if ( event.type === 'focus' || event.type === 'blur' ) {
|
|
let self = this;
|
|
// Move up through the ancestors of the current link until we hit .nav-menu.
|
|
while ( ! self.classList.contains( 'nav-menu' ) ) {
|
|
// On li elements toggle the class .focus.
|
|
if ( 'li' === self.tagName.toLowerCase() ) {
|
|
self.classList.toggle( 'focus' );
|
|
}
|
|
self = self.parentNode;
|
|
}
|
|
}
|
|
|
|
if ( event.type === 'touchstart' ) {
|
|
const menuItem = this.parentNode;
|
|
event.preventDefault();
|
|
for ( const link of menuItem.parentNode.children ) {
|
|
if ( menuItem !== link ) {
|
|
link.classList.remove( 'focus' );
|
|
}
|
|
}
|
|
menuItem.classList.toggle( 'focus' );
|
|
}
|
|
}
|
|
}() );
|