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<title>[38035] trunk: Toolbar: Allow 0 as a value for the `tabindex` property of a menu item.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/38035">38035</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/38035","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>ocean90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-07-12 11:18:00 +0000 (Tue, 12 Jul 2016)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Toolbar: Allow 0 as a value for the `tabindex` property of a menu item.

To enhance accessibility for items without a link you can now define `tabindex="0"`, which makes descendant dropdowns accessible.

Props joedolson, afercia, ocean90.
Fixes <a href="https://core.trac.wordpress.org/ticket/32495">#32495</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpadminbarphp">trunk/src/wp-includes/class-wp-admin-bar.php</a></li>
<li><a href="#trunksrcwpincludescssadminbarcss">trunk/src/wp-includes/css/admin-bar.css</a></li>
<li><a href="#trunktestsphpunittestsadminbarphp">trunk/tests/phpunit/tests/adminbar.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpadminbarphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-admin-bar.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-admin-bar.php      2016-07-12 00:19:47 UTC (rev 38034)
+++ trunk/src/wp-includes/class-wp-admin-bar.php        2016-07-12 11:18:00 UTC (rev 38035)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -477,8 +477,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $is_parent = ! empty( $node->children );
</span><span class="cx" style="display: block; padding: 0 10px">                $has_link  = ! empty( $node->href );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $tabindex = isset( $node->meta['tabindex'] ) ? (int) $node->meta['tabindex'] : '';
-               $aria_attributes = $tabindex ? 'tabindex="' . $tabindex . '"' : '';
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         // Allow only numeric values, then casted to integers, and allow a tabindex value of `0` for a11y.
+               $tabindex = ( isset( $node->meta['tabindex'] ) && is_numeric( $node->meta['tabindex'] ) ) ? (int) $node->meta['tabindex'] : '';
+               $aria_attributes = ( '' !== $tabindex ) ? ' tabindex="' . $tabindex . '"' : '';
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $menuclass = '';
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -497,7 +498,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                <li id="<?php echo esc_attr( 'wp-admin-bar-' . $node->id ); ?>"<?php echo $menuclass; ?>><?php
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( $has_link ):
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                ?><a class="ab-item" <?php echo $aria_attributes; ?> href="<?php echo esc_url( $node->href ) ?>"<?php
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         ?><a class="ab-item"<?php echo $aria_attributes; ?> href="<?php echo esc_url( $node->href ) ?>"<?php
</ins><span class="cx" style="display: block; padding: 0 10px">                                         if ( ! empty( $node->meta['onclick'] ) ) :
</span><span class="cx" style="display: block; padding: 0 10px">                                                ?> onclick="<?php echo esc_js( $node->meta['onclick'] ); ?>"<?php
</span><span class="cx" style="display: block; padding: 0 10px">                                        endif;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -518,7 +519,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                endif;
</span><span class="cx" style="display: block; padding: 0 10px">                                ?>><?php
</span><span class="cx" style="display: block; padding: 0 10px">                        else:
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                ?><div class="ab-item ab-empty-item" <?php echo $aria_attributes;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         ?><div class="ab-item ab-empty-item"<?php echo $aria_attributes;
</ins><span class="cx" style="display: block; padding: 0 10px">                                 if ( ! empty( $node->meta['title'] ) ) :
</span><span class="cx" style="display: block; padding: 0 10px">                                        ?> title="<?php echo esc_attr( $node->meta['title'] ); ?>"<?php
</span><span class="cx" style="display: block; padding: 0 10px">                                endif;
</span></span></pre></div>
<a id="trunksrcwpincludescssadminbarcss"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/css/admin-bar.css</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/css/admin-bar.css   2016-07-12 00:19:47 UTC (rev 38034)
+++ trunk/src/wp-includes/css/admin-bar.css     2016-07-12 11:18:00 UTC (rev 38035)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -286,6 +286,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> #wpadminbar .quicklinks .ab-sub-wrapper .menupop.hover > a,
</span><span class="cx" style="display: block; padding: 0 10px"> #wpadminbar .quicklinks .menupop.hover ul li a:hover,
</span><span class="cx" style="display: block; padding: 0 10px"> #wpadminbar .quicklinks .menupop.hover ul li a:focus,
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+#wpadminbar .quicklinks .menupop.hover ul li div[tabindex]:hover,
+#wpadminbar .quicklinks .menupop.hover ul li div[tabindex]:focus,
</ins><span class="cx" style="display: block; padding: 0 10px"> #wpadminbar.nojs .quicklinks .menupop:hover ul li a:hover,
</span><span class="cx" style="display: block; padding: 0 10px"> #wpadminbar.nojs .quicklinks .menupop:hover ul li a:focus,
</span><span class="cx" style="display: block; padding: 0 10px"> #wpadminbar li:hover .ab-icon:before,
</span></span></pre></div>
<a id="trunktestsphpunittestsadminbarphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/adminbar.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/adminbar.php    2016-07-12 00:19:47 UTC (rev 38034)
+++ trunk/tests/phpunit/tests/adminbar.php      2016-07-12 11:18:00 UTC (rev 38035)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -132,7 +132,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $profile_url, $node_my_account->href );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $profile_url, $node_user_info->href );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $profile_url, $node_edit_profile->href );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-
</del><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -254,4 +253,96 @@
</span><span class="cx" style="display: block; padding: 0 10px">                return $wp_admin_bar;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        /**
+        * @ticket 32495
+        *
+        * @dataProvider data_admin_bar_nodes_with_tabindex_meta
+        *
+        * @param array  $node_data     The data for a node, passed to `WP_Admin_Bar::add_node()`.
+        * @param string $expected_html The expected HTML when admin menu is rendered.
+        */
+       public function test_admin_bar_with_tabindex_meta( $node_data, $expected_html ) {
+               $admin_bar = new WP_Admin_Bar();
+               $admin_bar->add_node( $node_data );
+               $admin_bar_html = get_echo( array( $admin_bar, 'render' ) );
+               $this->assertContains( $expected_html, $admin_bar_html );
+       }
+
+       /**
+        * Data provider for test_admin_bar_with_tabindex_meta().
+        *
+        * @return array {
+        *     @type array {
+        *         @type array  $node_data     The data for a node, passed to `WP_Admin_Bar::add_node()`.
+        *         @type string $expected_html The expected HTML when admin bar is rendered.
+        *     }
+        * }
+        */
+       public function data_admin_bar_nodes_with_tabindex_meta() {
+               return array(
+                       array(
+                               // No tabindex.
+                               array(
+                                       'id' => 'test-node',
+                               ),
+                               '<div class="ab-item ab-empty-item">',
+                       ),
+                       array(
+                               // Empty string.
+                               array(
+                                       'id' => 'test-node',
+                                       'meta' => array( 'tabindex' => '' ),
+                               ),
+                               '<div class="ab-item ab-empty-item">',
+                       ),
+                       array(
+                               // Integer 1 as string.
+                               array(
+                                       'id'   => 'test-node',
+                                       'meta' => array( 'tabindex' => '1' ),
+                               ),
+                               '<div class="ab-item ab-empty-item" tabindex="1">',
+                       ),
+                       array(
+                               // Integer -1 as string.
+                               array(
+                                       'id'   => 'test-node',
+                                       'meta' => array( 'tabindex' => '-1' ),
+                               ),
+                               '<div class="ab-item ab-empty-item" tabindex="-1">',
+                       ),
+                       array(
+                               // Integer 0 as string.
+                               array(
+                                       'id'   => 'test-node',
+                                       'meta' => array( 'tabindex' => '0' ),
+                               ),
+                               '<div class="ab-item ab-empty-item" tabindex="0">',
+                       ),
+                       array(
+                               // Integer, 0.
+                               array(
+                                       'id'   => 'test-node',
+                                       'meta' => array( 'tabindex' => 0 ),
+                               ),
+                               '<div class="ab-item ab-empty-item" tabindex="0">',
+                       ),
+                       array(
+                               // Integer, 2.
+                               array(
+                                       'id'   => 'test-node',
+                                       'meta' => array( 'tabindex' => 2 ),
+                               ),
+                               '<div class="ab-item ab-empty-item" tabindex="2">',
+                       ),
+                       array(
+                               // Boolean, false
+                               array(
+                                       'id'   => 'test-node',
+                                       'meta' => array( 'tabindex' => false ),
+                               ),
+                               '<div class="ab-item ab-empty-item">',
+                       ),
+               );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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