我在复习this extremely helpful post 从nav菜单中清除WP生成的类和ID，并找到RevelationTravis\'s option-- 请参阅下面的代码——这是一种有效地“白名单”某些菜单类的好方法。然而，我想知道是否有一种方法可以保留通过WP菜单管理面板指定的自定义导航菜单类，即“CSS类（可选）”，而不必按名称明确列出它们？
<?php
//Deletes all CSS classes and id\'s, except for those listed in the array below
function custom_wp_nav_menu($var) {
return is_array($var) ? array_intersect($var, array(
//List of allowed menu classes
\'current_page_item\',
\'current_page_parent\',
\'current_page_ancestor\',
\'first\',
\'last\',
\'vertical\',
\'horizontal\'
)
) : \'\';
}
add_filter(\'nav_menu_css_class\', \'custom_wp_nav_menu\');
add_filter(\'nav_menu_item_id\', \'custom_wp_nav_menu\');
add_filter(\'page_css_class\', \'custom_wp_nav_menu\');
//Replaces "current-menu-item" with "active"
function current_to_active($text){
$replace = array(
//List of menu item classes that should be changed to "active"
\'current_page_item\' => \'active\',
\'current_page_parent\' => \'active\',
\'current_page_ancestor\' => \'active\',
);
$text = str_replace(array_keys($replace), $replace, $text);
return $text;
}
add_filter (\'wp_nav_menu\',\'current_to_active\');
//Deletes empty classes and removes the sub menu class
function strip_empty_classes($menu) {
$menu = preg_replace(\'/ class=""| class="sub-menu"/\',\'\',$menu);
return $menu;
}
add_filter (\'wp_nav_menu\',\'strip_empty_classes\');
?>
感谢您的帮助。
最合适的回答,由SO网友:bonger 整理而成
是的，它们存储为元数据\'_menu_item_classes\' 对于每个菜单项，例如(updated to use separate function)
function custom_wp_nav_menu_css_class( $classes, $item, $args, $depth ) {
$whitelist = array(
//List of allowed menu classes
\'current_page_item\',
\'current_page_parent\',
\'current_page_ancestor\',
\'first\',
\'last\',
\'vertical\',
\'horizontal\'
);
// Note array containing empty entry always created for menu item meta so filter out.
if ( $optional = array_filter( get_post_meta( $item->ID, \'_menu_item_classes\', true ) ) ) {
$whitelist = array_merge( $whitelist, $optional );
}
return array_intersect( $classes, $whitelist );
}
add_filter( \'nav_menu_css_class\', \'custom_wp_nav_menu_css_class\', 10, 4 );
