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<title>[33138] trunk: Customizer: Remove additional wrapper element around `wp_nav_menu()` which broke some theme designs.</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/33138">33138</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/33138","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>westonruter</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2015-07-08 21:29:53 +0000 (Wed, 08 Jul 2015)</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'>Customizer: Remove additional wrapper element around `wp_nav_menu()` which broke some theme designs.

Also includes these related changes:
* Export `oldContainer` and `newContainer` among the `customize-preview-menu-refreshed` event params for themes to be able to more easily re-initialize the DOM elements.
* Improve performance for partial refresh by only sending settings related to the menu being previewed.
* Fix previewing of menu assigned to Custom Menu by exporting a menu `term_id` as opposed to an object, as the former is more stable for comparing in in args hashes.
* Do full refresh of preview when nav menu unassigned so that the layout can be updated.
* Harden conditions for when partial refresh is eligible for a `wp_nav_menu()` instance.

Fixes <a href="https://core.trac.wordpress.org/ticket/32841">#32841</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpcustomizenavmenusphp">trunk/src/wp-includes/class-wp-customize-nav-menus.php</a></li>
<li><a href="#trunksrcwpincludesjscustomizepreviewnavmenusjs">trunk/src/wp-includes/js/customize-preview-nav-menus.js</a></li>
<li><a href="#trunktestsphpunittestscustomizenavmenusphp">trunk/tests/phpunit/tests/customize/nav-menus.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpcustomizenavmenusphp"></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-customize-nav-menus.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-nav-menus.php    2015-07-08 21:27:25 UTC (rev 33137)
+++ trunk/src/wp-includes/class-wp-customize-nav-menus.php      2015-07-08 21:29:53 UTC (rev 33138)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -768,6 +768,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        ( empty( $args['fallback_cb'] ) || is_string( $args['fallback_cb'] ) )
</span><span class="cx" style="display: block; padding: 0 10px">                        &&
</span><span class="cx" style="display: block; padding: 0 10px">                        ( empty( $args['walker'] ) || is_string( $args['walker'] ) )
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        &&
+                       (
+                               ! empty( $args['theme_location'] )
+                               ||
+                               ( ! empty( $args['menu'] ) && ( is_numeric( $args['menu'] ) || is_object( $args['menu'] ) ) )
+                       )
</ins><span class="cx" style="display: block; padding: 0 10px">                 );
</span><span class="cx" style="display: block; padding: 0 10px">                $args['can_partial_refresh'] = $can_partial_refresh;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -778,6 +784,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $hashed_args['walker'] = '';
</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">+                // Replace object menu arg with a term_id menu arg, as this exports better to JS and is easier to compare hashes.
+               if ( ! empty( $hashed_args['menu'] ) && is_object( $hashed_args['menu'] ) ) {
+                       $hashed_args['menu'] = $hashed_args['menu']->term_id;
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 ksort( $hashed_args );
</span><span class="cx" style="display: block; padding: 0 10px">                $hashed_args['args_hash'] = $this->hash_nav_menu_args( $hashed_args );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -798,10 +809,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        public function filter_wp_nav_menu( $nav_menu_content, $args ) {
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $args->can_partial_refresh ) && ! empty( $args->instance_number ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $nav_menu_content = sprintf(
-                               '<div id="partial-refresh-menu-container-%1$d" class="partial-refresh-menu-container" data-instance-number="%1$d">%2$s</div>',
-                               $args->instance_number,
-                               $nav_menu_content
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $nav_menu_content = preg_replace(
+                               '/(?<=class=")/',
+                               sprintf( 'partial-refreshable-nav-menu partial-refreshable-nav-menu-%1$d ', $args->instance_number ),
+                               $nav_menu_content,
+                               1 // Only update the class on the first element found, the menu container.
</ins><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">                return $nav_menu_content;
</span></span></pre></div>
<a id="trunksrcwpincludesjscustomizepreviewnavmenusjs"></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/js/customize-preview-nav-menus.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/js/customize-preview-nav-menus.js   2015-07-08 21:27:25 UTC (rev 33137)
+++ trunk/src/wp-includes/js/customize-preview-nav-menus.js     2015-07-08 21:29:53 UTC (rev 33138)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -159,19 +159,27 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @param {int} instanceNumber
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        self.refreshMenuInstance = function( instanceNumber ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                var self = this, data, customized, container, request, wpNavArgs, instance;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         var self = this, data, menuId, customized, container, request, wpNavArgs, instance, containerInstanceClassName;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! self.navMenuInstanceArgs[ instanceNumber ] ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        throw new Error( 'unknown_instance_number' );
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px">                instance = self.navMenuInstanceArgs[ instanceNumber ];
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                container = $( '#partial-refresh-menu-container-' + String( instanceNumber ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         containerInstanceClassName = 'partial-refreshable-nav-menu-' + String( instanceNumber );
+               container = $( '.' + containerInstanceClassName );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( ! instance.can_partial_refresh || 0 === container.length ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( _.isNumber( instance.menu ) ) {
+                       menuId = instance.menu;
+               } else if ( instance.theme_location && api.has( 'nav_menu_locations[' + instance.theme_location + ']' ) ) {
+                       menuId = api( 'nav_menu_locations[' + instance.theme_location + ']' ).get();
+               }
+
+               if ( ! menuId || ! instance.can_partial_refresh || 0 === container.length ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         api.preview.send( 'refresh' );
</span><span class="cx" style="display: block; padding: 0 10px">                        return;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                menuId = parseInt( menuId, 10 );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                data = {
</span><span class="cx" style="display: block; padding: 0 10px">                        nonce: self.previewCustomizeNonce, // for Customize Preview
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -183,8 +191,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                data[ self.renderQueryVar ] = '1';
</span><span class="cx" style="display: block; padding: 0 10px">                customized = {};
</span><span class="cx" style="display: block; padding: 0 10px">                api.each( function( setting, id ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        // @todo We need to limit this to just the menu items that are associated with this menu/location.
-                       if ( /^(nav_menu|nav_menu_locations)/.test( id ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 // @todo Core should propagate the dirty state into the Preview as well so we can use that here.
+                       if ( id === 'nav_menu[' + String( menuId ) + ']' || ( /^nav_menu_item\[/.test( id ) && setting() && menuId === setting().nav_menu_term_id ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 customized[ id ] = setting.get();
</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">@@ -203,20 +211,26 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        url: self.requestUri
</span><span class="cx" style="display: block; padding: 0 10px">                } );
</span><span class="cx" style="display: block; padding: 0 10px">                request.done( function( data ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        var eventParam;
-                       container.empty().append( $( data ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 // If the menu is now not visible, refresh since the page layout may have changed.
+                       if ( false === data ) {
+                               api.preview.send( 'refresh' );
+                               return;
+                       }
+
+                       var eventParam, previousContainer = container;
+                       container = $( data );
+                       container.addClass( containerInstanceClassName );
+                       container.addClass( 'partial-refreshable-nav-menu customize-partial-refreshing' );
+                       previousContainer.replaceWith( container );
</ins><span class="cx" style="display: block; padding: 0 10px">                         eventParam = {
</span><span class="cx" style="display: block; padding: 0 10px">                                instanceNumber: instanceNumber,
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                wpNavArgs: wpNavArgs
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         wpNavArgs: wpNavArgs,
+                               oldContainer: previousContainer,
+                               newContainer: container
</ins><span class="cx" style="display: block; padding: 0 10px">                         };
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        container.removeClass( 'customize-partial-refreshing' );
</ins><span class="cx" style="display: block; padding: 0 10px">                         $( document ).trigger( 'customize-preview-menu-refreshed', [ eventParam ] );
</span><span class="cx" style="display: block; padding: 0 10px">                } );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                request.fail( function() {
-                       // @todo provide some indication for why
-               } );
-               request.always( function() {
-                       container.removeClass( 'customize-partial-refreshing' );
-               } );
</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">        self.currentRefreshMenuInstanceDebouncedCalls = {};
</span></span></pre></div>
<a id="trunktestsphpunittestscustomizenavmenusphp"></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/customize/nav-menus.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/customize/nav-menus.php 2015-07-08 21:27:25 UTC (rev 33137)
+++ trunk/tests/phpunit/tests/customize/nav-menus.php   2015-07-08 21:29:53 UTC (rev 33138)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -353,6 +353,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        'echo'            => true,
</span><span class="cx" style="display: block; padding: 0 10px">                        'fallback_cb'     => 'wp_page_menu',
</span><span class="cx" style="display: block; padding: 0 10px">                        'walker'          => '',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        'menu'            => wp_create_nav_menu( 'Foo' ),
</ins><span class="cx" style="display: block; padding: 0 10px">                 ) );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( 1, $results['can_partial_refresh'] );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -390,6 +391,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $args = $menus->filter_wp_nav_menu_args( array(
</span><span class="cx" style="display: block; padding: 0 10px">                        'echo'        => true,
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        'menu'        => wp_create_nav_menu( 'Foo' ),
</ins><span class="cx" style="display: block; padding: 0 10px">                         'fallback_cb' => 'wp_page_menu',
</span><span class="cx" style="display: block; padding: 0 10px">                        'walker'      => '',
</span><span class="cx" style="display: block; padding: 0 10px">                ) );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -401,11 +403,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $object_args = json_decode( json_encode( $args ), false );
</span><span class="cx" style="display: block; padding: 0 10px">                $result = $menus->filter_wp_nav_menu( $nav_menu_content, $object_args );
</span><span class="cx" style="display: block; padding: 0 10px">                $expected = sprintf(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        '<div id="partial-refresh-menu-container-%1$d" class="partial-refresh-menu-container" data-instance-number="%1$d">%2$s</div>',
-                       $args['instance_number'],
-                       $nav_menu_content
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 '<div class="partial-refreshable-nav-menu partial-refreshable-nav-menu-%1$d menu">',
+                       $args['instance_number']
</ins><span class="cx" style="display: block; padding: 0 10px">                 );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->assertEquals( $expected, $result );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $this->assertStringStartsWith( $expected, $result );
</ins><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></pre>
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