Featured in: Building a Dynamic Secondary Menu
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| <?php | |
| /** | |
| * Submenu items in secondary menu | |
| * | |
| * Assign the same menu to 'header' and 'secondary'. | |
| * This will display the current section's subpages in 'secondary' | |
| * | |
| * @author Bill Erickson | |
| * @link http://www.billerickson.net/building-dynamic-secondary-menu | |
| * | |
| * @param array $menu_items, menu items in this menu | |
| * @param array $args, arguments passed to wp_nav_menu() | |
| * @return array $menu_items | |
| * | |
| */ | |
| function be_submenu_items_in_secondary( $menu_items, $args ) { | |
| // Only run on 'secondary' menu location. | |
| if( 'secondary' !== $args->theme_location ) | |
| return $menu_items; | |
| // Find active section | |
| $active_section = false; | |
| foreach( $menu_items as $menu_item ) { | |
| if( ! $menu_item->menu_item_parent && array_intersect( array( 'current-menu-item', 'current-menu-ancestor' ), $menu_item->classes ) ) | |
| $active_section = $menu_item->ID; | |
| } | |
| if( ! $active_section ) | |
| return false; | |
| // Gather all menu items in this section | |
| $sub_menu = array(); | |
| $section_ids = array( $active_section ); | |
| foreach( $menu_items as $menu_item ) { | |
| if( in_array( $menu_item->menu_item_parent, $section_ids ) ) { | |
| $sub_menu[] = $menu_item; | |
| $section_ids[] = $menu_item->ID; | |
| } | |
| } | |
| return $sub_menu; | |
| } | |
| add_filter( 'wp_nav_menu_objects', 'be_submenu_items_in_secondary', 10, 2 ); |
