From b69fe9bd6ab373df8043adf81b4338d7367ea134 Mon Sep 17 00:00:00 2001
From: Lance Willett <lancewillett@git.wordpress.org>
Date: Sun, 15 Mar 2015 20:00:57 +0000
Subject: [PATCH] Twenty Thirteen: add ARIA attributes to menu toggle. See
 #31527.

git-svn-id: https://develop.svn.wordpress.org/trunk@31785 602fd350-edb4-49c9-b593-d223f7449a82
---
 .../themes/twentythirteen/functions.php       |  2 +-
 .../themes/twentythirteen/header.php          |  2 +-
 .../themes/twentythirteen/js/functions.js     | 42 +++++++++++++++----
 3 files changed, 35 insertions(+), 11 deletions(-)

diff --git a/src/wp-content/themes/twentythirteen/functions.php b/src/wp-content/themes/twentythirteen/functions.php
index e845668f4b..6b001941c5 100644
--- a/src/wp-content/themes/twentythirteen/functions.php
+++ b/src/wp-content/themes/twentythirteen/functions.php
@@ -170,7 +170,7 @@ function twentythirteen_scripts_styles() {
 		wp_enqueue_script( 'jquery-masonry' );
 
 	// Loads JavaScript file with functionality specific to Twenty Thirteen.
-	wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '2014-06-08', true );
+	wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '20150315', true );
 
 	// Add Source Sans Pro and Bitter fonts, used in the main stylesheet.
 	wp_enqueue_style( 'twentythirteen-fonts', twentythirteen_fonts_url(), array(), null );
diff --git a/src/wp-content/themes/twentythirteen/header.php b/src/wp-content/themes/twentythirteen/header.php
index f61c28f0f8..094f74cc9f 100644
--- a/src/wp-content/themes/twentythirteen/header.php
+++ b/src/wp-content/themes/twentythirteen/header.php
@@ -42,7 +42,7 @@
 				<nav id="site-navigation" class="navigation main-navigation" role="navigation">
 					<button class="menu-toggle"><?php _e( 'Menu', 'twentythirteen' ); ?></button>
 					<a class="screen-reader-text skip-link" href="#content" title="<?php esc_attr_e( 'Skip to content', 'twentythirteen' ); ?>"><?php _e( 'Skip to content', 'twentythirteen' ); ?></a>
-					<?php wp_nav_menu( array( 'theme_location' => 'primary', 'menu_class' => 'nav-menu' ) ); ?>
+					<?php wp_nav_menu( array( 'theme_location' => 'primary', 'menu_class' => 'nav-menu', 'menu_id' => 'primary-menu' ) ); ?>
 					<?php get_search_form(); ?>
 				</nav><!-- #site-navigation -->
 			</div><!-- #navbar -->
diff --git a/src/wp-content/themes/twentythirteen/js/functions.js b/src/wp-content/themes/twentythirteen/js/functions.js
index 526c15d6b3..522457bf80 100644
--- a/src/wp-content/themes/twentythirteen/js/functions.js
+++ b/src/wp-content/themes/twentythirteen/js/functions.js
@@ -6,7 +6,12 @@
 
 ( function( $ ) {
 	var body    = $( 'body' ),
-	    _window = $( window );
+	    _window = $( window ),
+		nav, button, menu;
+
+	nav = $( '#site-navigation' );
+	button = nav.find( '.menu-toggle' );
+	menu = nav.find( '.nav-menu' );
 
 	/**
 	 * Adds a top margin to the footer if the sidebar widget area is higher
@@ -29,18 +34,11 @@
 	 * Enables menu toggle for small screens.
 	 */
 	( function() {
-		var nav = $( '#site-navigation' ), button, menu;
-		if ( ! nav ) {
-			return;
-		}
-
-		button = nav.find( '.menu-toggle' );
-		if ( ! button ) {
+		if ( ! nav || ! button ) {
 			return;
 		}
 
 		// Hide button if menu is missing or empty.
-		menu = nav.find( '.nav-menu' );
 		if ( ! menu || ! menu.children().length ) {
 			button.hide();
 			return;
@@ -48,6 +46,13 @@
 
 		button.on( 'click.twentythirteen', function() {
 			nav.toggleClass( 'toggled-on' );
+			if ( nav.hasClass( 'toggled-on' ) ) {
+				$( this ).attr( 'aria-expanded', 'true' );
+				menu.attr( 'aria-expanded', 'true' );
+			} else {
+				$( this ).attr( 'aria-expanded', 'false' );
+				menu.attr( 'aria-expanded', 'false' );
+			}
 		} );
 
 		// Fix sub-menus for touch devices.
@@ -69,6 +74,25 @@
 		} );
 	} )();
 
+	// Add or remove ARIA attributes.
+	function onResizeARIA() {
+		if ( 643 > _window.width() ) {
+			button.attr( 'aria-expanded', 'false' );
+			menu.attr( 'aria-expanded', 'false' );
+			button.attr( 'aria-controls', 'primary-menu' );
+		} else {
+			button.removeAttr( 'aria-expanded' );
+			menu.removeAttr( 'aria-expanded' );
+			button.removeAttr( 'aria-controls' );
+		}
+	}
+
+	_window
+		.on( 'load.twentythirteen', onResizeARIA )
+		.on( 'resize.twentythirteen', function() {
+			onResizeARIA();
+	} );
+
 	/**
 	 * Makes "skip to content" link work correctly in IE9 and Chrome for better
 	 * accessibility.