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<title>[31604] trunk/src/wp-admin: Nav menus: Better JS performance on initial load of edit screen.</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/31604">31604</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/31604","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>helen</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2015-03-03 21:13:37 +0000 (Tue, 03 Mar 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'>Nav menus: Better JS performance on initial load of edit screen.
The accessibility helpers previously processed all items when editing a menu, which was quite slow to the point of being unresponsive for large menus. They now only process items when they are expanded or a user comes near them in some way, such as hover or focus.
Also simplifies a redundant set of click event handlers down to one, which further enhances performance.
props atimmer, sevenspark.
fixes <a href="https://core.trac.wordpress.org/ticket/25698">#25698</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludesnavmenuphp">trunk/src/wp-admin/includes/nav-menu.php</a></li>
<li><a href="#trunksrcwpadminjsnavmenujs">trunk/src/wp-admin/js/nav-menu.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadminincludesnavmenuphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/nav-menu.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/nav-menu.php 2015-03-03 19:46:27 UTC (rev 31603)
+++ trunk/src/wp-admin/includes/nav-menu.php 2015-03-03 21:13:37 UTC (rev 31604)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -186,11 +186,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> <p class="field-move hide-if-no-js description description-wide">
</span><span class="cx" style="display: block; padding: 0 10px"> <label>
</span><span class="cx" style="display: block; padding: 0 10px"> <span><?php _e( 'Move' ); ?></span>
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- <a href="#" class="menus-move-up"><?php _e( 'Up one' ); ?></a>
- <a href="#" class="menus-move-down"><?php _e( 'Down one' ); ?></a>
- <a href="#" class="menus-move-left"></a>
- <a href="#" class="menus-move-right"></a>
- <a href="#" class="menus-move-top"><?php _e( 'To the top' ); ?></a>
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ <a href="#" class="menus-move menus-move-up" data-dir="up"><?php _e( 'Up one' ); ?></a>
+ <a href="#" class="menus-move menus-move-down" data-dir="down"><?php _e( 'Down one' ); ?></a>
+ <a href="#" class="menus-move menus-move-left" data-dir="left"></a>
+ <a href="#" class="menus-move menus-move-right" data-dir="right"></a>
+ <a href="#" class="menus-move menus-move-top" data-dir="top"><?php _e( 'To the top' ); ?></a>
</ins><span class="cx" style="display: block; padding: 0 10px"> </label>
</span><span class="cx" style="display: block; padding: 0 10px"> </p>
</span><span class="cx" style="display: block; padding: 0 10px">
</span></span></pre></div>
<a id="trunksrcwpadminjsnavmenujs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/js/nav-menu.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/js/nav-menu.js 2015-03-03 19:46:27 UTC (rev 31603)
+++ trunk/src/wp-admin/js/nav-menu.js 2015-03-03 21:13:37 UTC (rev 31604)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -386,108 +386,137 @@
</span><span class="cx" style="display: block; padding: 0 10px"> api.refreshKeyboardAccessibility();
</span><span class="cx" style="display: block; padding: 0 10px"> api.refreshAdvancedAccessibility();
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Events
- menu.on( 'click', '.menus-move-up', function ( e ) {
- api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), 'up' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Refresh the accessibility when the user comes close to the item in any way
+ menu.on( 'mouseenter.refreshAccessibility focus.refreshAccessibility touchstart.refreshAccessibility' , '.menu-item' , function(){
+ api.refreshAdvancedAccessibilityOfItem( $( this ).find( '.item-edit' ) );
+ } );
+
+ // We have to update on click aswell because we might hover first, change the item and then click.
+ menu.on( 'click', '.item-edit', function() {
+ api.refreshAdvancedAccessibilityOfItem( $( this ) );
+ } );
+
+ // Links for moving items
+ menu.on( 'click', '.menus-move', function ( e ) {
+ var $this = $( this ),
+ dir = $this.data( 'dir' );
+
+ if ( 'undefined' !== typeof dir ) {
+ api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), dir );
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> e.preventDefault();
</span><span class="cx" style="display: block; padding: 0 10px"> });
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- menu.on( 'click', '.menus-move-down', function ( e ) {
- api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), 'down' );
- e.preventDefault();
- });
- menu.on( 'click', '.menus-move-top', function ( e ) {
- api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), 'top' );
- e.preventDefault();
- });
- menu.on( 'click', '.menus-move-left', function ( e ) {
- api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), 'left' );
- e.preventDefault();
- });
- menu.on( 'click', '.menus-move-right', function ( e ) {
- api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), 'right' );
- e.preventDefault();
- });
</del><span class="cx" style="display: block; padding: 0 10px"> },
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- refreshAdvancedAccessibility : function() {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * refreshAdvancedAccessibilityOfItem( [itemToRefresh] )
+ *
+ * Refreshes advanced accessibility buttons for one menu item.
+ * Shows or hides buttons based on the location of the menu item.
+ *
+ * @param {object} itemToRefresh The menu item that might need it's advanced accessibility buttons refreshed
+ */
+ refreshAdvancedAccessibilityOfItem : function( itemToRefresh ) {
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Hide all links by default
- $( '.menu-item-settings .field-move a' ).css( 'display', 'none' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Only refresh accessibility when necessary
+ if ( true !== $( itemToRefresh ).data( 'needs_accessibility_refresh' ) ) {
+ return;
+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $( '.item-edit' ).each( function() {
- var thisLink, thisLinkText, primaryItems, itemPosition, title,
- parentItem, parentItemId, parentItemName, subItems,
- $this = $(this),
- menuItem = $this.closest( 'li.menu-item' ).first(),
- depth = menuItem.menuItemDepth(),
- isPrimaryMenuItem = ( 0 === depth ),
- itemName = $this.closest( '.menu-item-handle' ).find( '.menu-item-title' ).text(),
- position = parseInt( menuItem.index(), 10 ),
- prevItemDepth = ( isPrimaryMenuItem ) ? depth : parseInt( depth - 1, 10 ),
- prevItemNameLeft = menuItem.prevAll('.menu-item-depth-' + prevItemDepth).first().find( '.menu-item-title' ).text(),
- prevItemNameRight = menuItem.prevAll('.menu-item-depth-' + depth).first().find( '.menu-item-title' ).text(),
- totalMenuItems = $('#menu-to-edit li').length,
- hasSameDepthSibling = menuItem.nextAll( '.menu-item-depth-' + depth ).length;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ var thisLink, thisLinkText, primaryItems, itemPosition, title,
+ parentItem, parentItemId, parentItemName, subItems,
+ $this = $( itemToRefresh ),
+ menuItem = $this.closest( 'li.menu-item' ).first(),
+ depth = menuItem.menuItemDepth(),
+ isPrimaryMenuItem = ( 0 === depth ),
+ itemName = $this.closest( '.menu-item-handle' ).find( '.menu-item-title' ).text(),
+ position = parseInt( menuItem.index(), 10 ),
+ prevItemDepth = ( isPrimaryMenuItem ) ? depth : parseInt( depth - 1, 10 ),
+ prevItemNameLeft = menuItem.prevAll('.menu-item-depth-' + prevItemDepth).first().find( '.menu-item-title' ).text(),
+ prevItemNameRight = menuItem.prevAll('.menu-item-depth-' + depth).first().find( '.menu-item-title' ).text(),
+ totalMenuItems = $('#menu-to-edit li').length,
+ hasSameDepthSibling = menuItem.nextAll( '.menu-item-depth-' + depth ).length;
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> menuItem.find( '.field-move' ).toggle( totalMenuItems > 1 );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Where can they move this menu item?
- if ( 0 !== position ) {
- thisLink = menuItem.find( '.menus-move-up' );
- thisLink.prop( 'title', menus.moveUp ).css( 'display', 'inline' );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Where can they move this menu item?
+ if ( 0 !== position ) {
+ thisLink = menuItem.find( '.menus-move-up' );
+ thisLink.prop( 'title', menus.moveUp ).css( 'display', 'inline' );
+ }
</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 ( 0 !== position && isPrimaryMenuItem ) {
- thisLink = menuItem.find( '.menus-move-top' );
- thisLink.prop( 'title', menus.moveToTop ).css( 'display', 'inline' );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( 0 !== position && isPrimaryMenuItem ) {
+ thisLink = menuItem.find( '.menus-move-top' );
+ thisLink.prop( 'title', menus.moveToTop ).css( 'display', 'inline' );
+ }
</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 ( position + 1 !== totalMenuItems && 0 !== position ) {
- thisLink = menuItem.find( '.menus-move-down' );
- thisLink.prop( 'title', menus.moveDown ).css( 'display', 'inline' );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( position + 1 !== totalMenuItems && 0 !== position ) {
+ thisLink = menuItem.find( '.menus-move-down' );
+ thisLink.prop( 'title', menus.moveDown ).css( 'display', 'inline' );
+ }
</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 ( 0 === position && 0 !== hasSameDepthSibling ) {
- thisLink = menuItem.find( '.menus-move-down' );
- thisLink.prop( 'title', menus.moveDown ).css( 'display', 'inline' );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( 0 === position && 0 !== hasSameDepthSibling ) {
+ thisLink = menuItem.find( '.menus-move-down' );
+ thisLink.prop( 'title', menus.moveDown ).css( 'display', 'inline' );
+ }
</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 ( ! isPrimaryMenuItem ) {
- thisLink = menuItem.find( '.menus-move-left' ),
- thisLinkText = menus.outFrom.replace( '%s', prevItemNameLeft );
- thisLink.prop( 'title', menus.moveOutFrom.replace( '%s', prevItemNameLeft ) ).html( thisLinkText ).css( 'display', 'inline' );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( ! isPrimaryMenuItem ) {
+ thisLink = menuItem.find( '.menus-move-left' ),
+ thisLinkText = menus.outFrom.replace( '%s', prevItemNameLeft );
+ thisLink.prop( 'title', menus.moveOutFrom.replace( '%s', prevItemNameLeft ) ).html( thisLinkText ).css( 'display', 'inline' );
+ }
</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 ( 0 !== position ) {
- if ( menuItem.find( '.menu-item-data-parent-id' ).val() !== menuItem.prev().find( '.menu-item-data-db-id' ).val() ) {
- thisLink = menuItem.find( '.menus-move-right' ),
- thisLinkText = menus.under.replace( '%s', prevItemNameRight );
- thisLink.prop( 'title', menus.moveUnder.replace( '%s', prevItemNameRight ) ).html( thisLinkText ).css( 'display', 'inline' );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( 0 !== position ) {
+ if ( menuItem.find( '.menu-item-data-parent-id' ).val() !== menuItem.prev().find( '.menu-item-data-db-id' ).val() ) {
+ thisLink = menuItem.find( '.menus-move-right' ),
+ thisLinkText = menus.under.replace( '%s', prevItemNameRight );
+ thisLink.prop( 'title', menus.moveUnder.replace( '%s', prevItemNameRight ) ).html( thisLinkText ).css( 'display', 'inline' );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ }
</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 ( isPrimaryMenuItem ) {
- primaryItems = $( '.menu-item-depth-0' ),
- itemPosition = primaryItems.index( menuItem ) + 1,
- totalMenuItems = primaryItems.length,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( isPrimaryMenuItem ) {
+ primaryItems = $( '.menu-item-depth-0' ),
+ itemPosition = primaryItems.index( menuItem ) + 1,
+ totalMenuItems = primaryItems.length,
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // String together help text for primary menu items
- title = menus.menuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$d', totalMenuItems );
- } else {
- parentItem = menuItem.prevAll( '.menu-item-depth-' + parseInt( depth - 1, 10 ) ).first(),
- parentItemId = parentItem.find( '.menu-item-data-db-id' ).val(),
- parentItemName = parentItem.find( '.menu-item-title' ).text(),
- subItems = $( '.menu-item .menu-item-data-parent-id[value="' + parentItemId + '"]' ),
- itemPosition = $( subItems.parents('.menu-item').get().reverse() ).index( menuItem ) + 1;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // String together help text for primary menu items
+ title = menus.menuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$d', totalMenuItems );
+ } else {
+ parentItem = menuItem.prevAll( '.menu-item-depth-' + parseInt( depth - 1, 10 ) ).first(),
+ parentItemId = parentItem.find( '.menu-item-data-db-id' ).val(),
+ parentItemName = parentItem.find( '.menu-item-title' ).text(),
+ subItems = $( '.menu-item .menu-item-data-parent-id[value="' + parentItemId + '"]' ),
+ itemPosition = $( subItems.parents('.menu-item').get().reverse() ).index( menuItem ) + 1;
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // String together help text for sub menu items
- title = menus.subMenuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$s', parentItemName );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // String together help text for sub menu items
+ title = menus.subMenuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$s', parentItemName );
+ }
</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.prop('title', title).html( title );
- });
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $this.prop('title', title).html( title );
+
+ // Mark this item's accessibility as refreshed
+ $this.data( 'needs_accessibility_refresh', false );
</ins><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">+ /**
+ * refreshAdvancedAccessibility
+ *
+ * Hides all advanced accessibility buttons and marks them for refreshing.
+ */
+ refreshAdvancedAccessibility : function() {
+
+ // Hide all links by default
+ $( '.menu-item-settings .field-move a' ).hide();
+
+ // Mark all menu items as unprocessed
+ $( '.item-edit' ).data( 'needs_accessibility_refresh', true );
+
+ // All open items have to be refreshed or they will show no links
+ $( '.menu-item-edit-active .item-edit' ).each( function() {
+ api.refreshAdvancedAccessibilityOfItem( this );
+ } );
+ },
+
</ins><span class="cx" style="display: block; padding: 0 10px"> refreshKeyboardAccessibility : function() {
</span><span class="cx" style="display: block; padding: 0 10px"> $( '.item-edit' ).off( 'focus' ).on( 'focus', function(){
</span><span class="cx" style="display: block; padding: 0 10px"> $(this).off( 'keydown' ).on( 'keydown', function(e){
</span></span></pre>
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