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Nav menus: Better JS performance on initial load of edit screen.

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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 #25698.

Built from https://develop.svn.wordpress.org/trunk@31604


git-svn-id: http://core.svn.wordpress.org/trunk@31585 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Helen Hou-Sandí
2015-03-03 21:14:25 +00:00
parent b8bbd959e2
commit 5567d03278
4 changed files with 117 additions and 88 deletions
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10
wp-admin/includes/nav-menu.php
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@@ -186,11 +186,11 @@ class Walker_Nav_Menu_Edit extends Walker_Nav_Menu {
<p class="field-move hide-if-no-js description description-wide">
<label>
<span><?php _e( 'Move' ); ?></span>
<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>
<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>
</label>
</p>