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Refactor navigation.js to Javascript ES6 (#1423)

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Ismail El Korchi 2020-05-15 00:26:03 +00:00 • committed by GitHub
parent ef77ee91d4
commit e7d95951b8
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2 changed files with 49 additions and 62 deletions
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109
js/navigation.js
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@ -5,19 +5,21 @@
* navigation support for dropdown menus.
*/
( function() {
var container, button, menu, links, i, len;
const siteNavigation = document.getElementById( 'site-navigation' );
container = document.getElementById( 'site-navigation' );
if ( ! container ) {
// Return early if the navigation don't exist.
if ( ! siteNavigation ) {
return;
}
button = container.getElementsByTagName( 'button' )[0];
const button = siteNavigation.getElementsByTagName( 'button' )[ 0 ];
// Return early if the button don't exist.
if ( 'undefined' === typeof button ) {
return;
}
menu = container.getElementsByTagName( 'ul' )[0];
const menu = siteNavigation.getElementsByTagName( 'ul' )[ 0 ];
// Hide menu toggle button if menu is empty and return early.
if ( 'undefined' === typeof menu ) {
@ -26,87 +28,72 @@
}
if ( ! menu.classList.contains( 'nav-menu' ) ) {
menu.className += ' nav-menu';
menu.classList.add( 'nav-menu' );
}
button.onclick = function() {
if ( container.classList.contains( 'toggled' ) ) {
container.className = container.className.replace( ' toggled', '' );
// 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 {
container.className += ' toggled';
button.setAttribute( 'aria-expanded', 'true' );
}
};
} );
// Close small menu when user clicks outside
// Remove the .toggled class and set aria-expanded to false when the user clicks outside the navigation.
document.addEventListener( 'click', function( event ) {
var isClickInside = container.contains( event.target );
const isClickInside = siteNavigation.contains( event.target );
if ( ! isClickInside ) {
container.className = container.className.replace( ' toggled', '' );
siteNavigation.classList.remove( 'toggled' );
button.setAttribute( 'aria-expanded', 'false' );
}
} );
// Get all the link elements within the menu.
links = menu.getElementsByTagName( 'a' );
const links = menu.getElementsByTagName( 'a' );
// Each time a menu link is focused or blurred, toggle focus.
for ( i = 0, len = links.length; i < len; i++ ) {
links[i].addEventListener( 'focus', toggleFocus, true );
links[i].addEventListener( 'blur', toggleFocus, true );
// 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() {
var self = this;
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;
}
}
// 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() ) {
if ( self.classList.contains( 'focus' ) ) {
self.className = self.className.replace( ' focus', '' );
} else {
self.className += ' focus';
if ( event.type === 'touchstart' ) {
const menuItem = this.parentNode;
event.preventDefault();
for ( const link of menuItem.parentNode.children ) {
if ( menuItem !== link ) {
link.classList.remove( 'focus' );
}
}
self = self.parentElement;
menuItem.classList.toggle( 'focus' );
}
}
/**
* Toggles `focus` class to allow submenu access on tablets.
*/
( function() {
var touchStartFn,
parentLink = container.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
if ( 'ontouchstart' in window ) {
touchStartFn = function( e ) {
var menuItem = this.parentNode;
if ( ! menuItem.classList.contains( 'focus' ) ) {
e.preventDefault();
for ( i = 0; i < menuItem.parentNode.children.length; ++i ) {
if ( menuItem === menuItem.parentNode.children[i] ) {
continue;
}
menuItem.parentNode.children[i].classList.remove( 'focus' );
}
menuItem.classList.add( 'focus' );
} else {
menuItem.classList.remove( 'focus' );
}
};
for ( i = 0; i < parentLink.length; ++i ) {
parentLink[i].addEventListener( 'touchstart', touchStartFn, false );
}
}
}( container ) );
}() );