Display menu starting from a menu item

Hi Tobias,

Certainly. This may be accomplished by adding the following filter to your active theme’s functions.php file:

use Advanced_Sidebar_Menu\Nav_Menu\Objects; const TOP_LEVEL_PARENT = 124344; add_action( 'advanced-sidebar-menu/menus/navigation/render', function () { add_filter( 'wp_nav_menu_objects', 'asm_specific_parent', 11 ); } ); add_action( 'advanced-sidebar-menu/menus/navigation-menu/render/after', function () { remove_filter( 'wp_nav_menu_objects', 'asm_specific_parent', 11 ); } ); function asm_specific_parent( $items ) { $objects = Objects::factory( $items ); foreach ( $objects->hierarchy[0] as $id ) { unset( $objects->hierarchy[ $id ], $objects->menu_items[ $id ] ); } $children = $objects->get_child_items_recursive( TOP_LEVEL_PARENT ); $current_family = array_map( function ( $item ) { return $item->get_id(); }, $children ); foreach ( $objects->hierarchy as $id => $children ) { if ( ! in_array( $id, $current_family, true ) ) { array_map( function ( $id ) use ( $objects ) { unset( $objects->menu_items[ $id ] ); }, (array) $objects->hierarchy[ $id ] ); unset( $objects->hierarchy[ $id ], $objects->menu_items[ $id ] ); } } $objects->hierarchy[0] = [ TOP_LEVEL_PARENT ]; return $objects->flatten(); }

To target your chosen menu item, you’ll need to change the TOP_LEVEL_PARENT = 124344; to match the id of your chosen menu item.

If you need help finding your menu item id, you may send us a link to your menu and the name of the item and we’ll adjust the code for you.

Have a great day!

Hi Tobias,

This version will add a “Load menu items beginning with” field to the widget settings to allow specifying the menu item id for each widget. This will allow you to use the widget as many times as you like while specifying the top level menu item for each widget.

use Advanced_Sidebar_Menu\Menus\Navigation; use Advanced_Sidebar_Menu\Nav_Menu\Objects; class ASM_Specific_Parent { const FIELD = 'specific-menu-parent'; /** * @var Navigation */ private $menu; public function __construct() { add_action( 'advanced-sidebar-menu/menus/navigation/render', function ( Navigation $menu ) { $this->menu = $menu; add_filter( 'wp_nav_menu_objects', [ $this, 'limit_menu_items' ], 11 ); } ); add_action( 'advanced-sidebar-menu/menus/navigation-menu/render/after', function () { remove_filter( 'wp_nav_menu_objects', 'asm_specific_parent', 11 ); } ); add_action( 'advanced-sidebar-menu/widget/navigation-menu/left-column', [ $this, 'widget_option' ], 25, 2 ); } public function widget_option( $instance, $widget ) { ?> <div class="advanced-sidebar-menu-column-box"> <p> <label> Load menus items beginning with. (id) </label> <input id="<?php echo esc_attr( $widget->get_field_id( self::FIELD ) ); ?>" name="<?php echo esc_attr( $widget->get_field_name( self::FIELD ) ); ?>" class="widefat advanced-sidebar-menu-block-field" type="number" value="<?php echo empty( $instance[ self::FIELD ] ) ? '' : esc_attr( $instance[ self::FIELD ] ?: '' ); ?>" /> <br /> <span class="description"> <em> <?php esc_html_e( 'Only display the entered item and children/grandchildren of the entered item.', 'advanced-sidebar-menu' ); ?> </em> </span> </p> </div> <?php } public function limit_menu_items( $items ) { $instance = $this->menu->get_widget_instance(); if ( empty( $instance['specific-menu-parent'] ) ) { return $items; } $objects = Objects::factory( $items ); foreach ( $objects->hierarchy[0] as $id ) { unset( $objects->hierarchy[ $id ], $objects->menu_items[ $id ] ); } $children = $objects->get_child_items_recursive( $instance['specific-menu-parent'] ); $current_family = array_map( function ( $item ) { return $item->get_id(); }, $children ); foreach ( $objects->hierarchy as $id => $children ) { if ( ! in_array( $id, $current_family, true ) ) { array_map( function ( $id ) use ( $objects ) { unset( $objects->menu_items[ $id ] ); }, (array) $objects->hierarchy[ $id ] ); unset( $objects->hierarchy[ $id ], $objects->menu_items[ $id ] ); } } $objects->hierarchy[0] = [ $instance['specific-menu-parent'] ]; return $objects->flatten(); } } new ASM_Specific_Parent();

Have a great day!