WordPress/wp-content/themes/twentyfifteen/js/functions.js

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JavaScript
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/* global screenReaderText */
/**
* Theme functions file.
*
* Contains handlers for navigation and widget area.
*/
( function( $ ) {
var $body, $window, sidebar, toolbarOffset;
// Add dropdown toggle that display child menu items.
$( '.main-navigation .page_item_has_children > a, .main-navigation .menu-item-has-children > a' ).after( '<button class="dropdown-toggle" aria-expanded="false">' + screenReaderText.expand + '</button>' );
$( '.dropdown-toggle' ).click( function( e ) {
var _this = $( this );
e.preventDefault();
_this.toggleClass( 'toggle-on' );
_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
_this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
} );
// Enable menu toggle for small screens.
( function() {
var secondary = $( '#secondary' ), button, menu, widgets, social;
if ( ! secondary ) {
return;
}
button = $( '.site-branding' ).find( '.secondary-toggle' );
if ( ! button ) {
return;
}
// Hide button if there is no widgets and menu is missing or empty.
menu = secondary.find( '.nav-menu' );
widgets = secondary.find( '#widget-area' );
social = secondary.find( '#social-navigation' );
if ( ! widgets.length && ! social.length && ( ! menu || ! menu.children().length ) ) {
button.hide();
return;
}
button.on( 'click.twentyfifteen', function() {
secondary.toggleClass( 'toggled-on' );
secondary.trigger( 'resize' );
$( this ).toggleClass( 'toggled-on' );
} );
} )();
// Sidebar (un)fixing: fix when short, un-fix when scroll needed
function fixedOrScrolledSidebar() {
if ( $window.width() >= 955 ) {
if ( sidebar.scrollHeight < ( $window.height() - toolbarOffset ) ) {
$body.addClass( 'sidebar-fixed' );
} else {
$body.removeClass( 'sidebar-fixed' );
}
} else {
$body.removeClass( 'sidebar-fixed' );
}
}
function debouncedFixedOrScrolledSidebar() {
var timeout;
return function() {
clearTimeout( timeout );
timeout = setTimeout( function() {
timeout = null;
fixedOrScrolledSidebar();
}, 150 );
};
}
$( document ).ready( function() {
// But! We only want to allow fixed sidebars when there are no submenus.
if ( $( '#site-navigation .sub-menu' ).length ) {
return;
}
// only initialize 'em if we need 'em
$body = $( 'body' );
$window = $( window );
sidebar = $( '#sidebar' )[0];
toolbarOffset = $body.is( '.admin-bar' ) ? $( '#wpadminbar' ).height() : 0;
$window
.on( 'load.twentyfifteen', fixedOrScrolledSidebar )
.on( 'resize.twentyfifteen', debouncedFixedOrScrolledSidebar() );
} );
} )( jQuery );