nav_menu_item_id │ filter-hook │ WP 3.0.1

Allows you to change the ID attribute of a menu item's <li> element.

WordPress core generates the <li> element's ID attribute as follows:

$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args, $depth );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

By default, the ID attribute is menu-item-{menu item ID}. The filter can completely change it. If the filter returns nothing, no ID attribute is added to the <li> element.

Usage

add_filter( 'nav_menu_item_id', 'wp_kama_nav_menu_item_id_filter', 10, 4 );

/**
 * Function for `nav_menu_item_id` filter-hook.
 * 
 * @param string   $menu_item_id The ID attribute applied to the menu item's `<li>` element.
 * @param WP_Post  $menu_item    The current menu item.
 * @param stdClass $args         An object of wp_nav_menu() arguments.
 * @param int      $depth        Depth of menu item. Used for padding.
 *
 * @return string
 */
function wp_kama_nav_menu_item_id_filter( $menu_item_id, $menu_item, $args, $depth ){
	// filter...
	return $menu_item_id;
}

$menu_id(string)

ID of the menu item's <li> element.

$item(WP_Post)

Current menu item object. Example:

WP_Post Object(
	[ID] => 265
	[post_author] => 1
	[post_date] => 2018-04-07 09:45:46
	[post_date_gmt] => 2018-04-07 06:45:46
	[post_content] =>
	[post_title] => Contact Us
	[post_excerpt] =>
	[post_status] => publish
	[comment_status] => closed
	[ping_status] => closed
	[post_password] =>
	[post_name] => 265
	[to_ping] =>
	[pinged] =>
	[post_modified] => 2018-04-19 00:20:29
	[post_modified_gmt] => 2018-04-18 21:20:29
	[post_content_filtered] =>
	[post_parent] => 0
	[guid] => http://wp-test.com/?p=265
	[menu_order] => 1
	[post_type] => nav_menu_item
	[post_mime_type] =>
	[comment_count] => 0
	[filter] => raw
	[db_id] => 265
	[menu_item_parent] => 0
	[object_id] => 214
	[object] => page
	[type] => post_type
	[type_label] => Page
	[url] => http://wp-test.com/post-99
	[title] => Contact Us
	[target] =>
	[attr_title] =>
	[description] =>
	[classes] => Array
		(
			[0] =>
			[1] => menu-item
			[2] => menu-item-type-post_type
			[3] => menu-item-object-page
		)

	[xfn] =>
	[current] =>
	[current_item_ancestor] =>
	[current_item_parent] =>
)

$args(stdClass)

Object containing parameters from wp_nav_menu(). Example:

stdClass Object
(
	[menu] => WP_Term Object
		(
			[term_id] => 21
			[name] => My First Menu
			[slug] => my-first-menu
			[term_group] => 0
			[term_taxonomy_id] => 21
			[taxonomy] => nav_menu
			[description] =>
			[parent] => 0
			[count] => 3
			[filter] => raw
		)

	[container] => div
	[container_class] =>
	[container_id] =>
	[menu_class] => primary-menu
	[menu_id] =>
	[echo] => 1
	[fallback_cb] => wp_page_menu
	[before] =>
	[after] =>
	[link_before] =>
	[link_after] =>
	[items_wrap] => <ul id="%1$s" class="%2$s">%3$s</ul>
	[item_spacing] => preserve
	[depth] => 0
	[walker] =>
	[theme_location] => primary
)

$depth(int)

Menu item level used for indentation. Top-level items have $depth = 0, nested items have $depth = 1, and so on.

Added in version 4.1.0.

Examples

#1 Remove the ID attribute from menu items

Remove IDs from every menu item on the site:

add_filter( 'nav_menu_item_id', '__return_empty_string' );

Remove the ID attribute from every menu item output in the primary menu location:

add_filter( 'nav_menu_item_id', 'change_menu_item_css_id', 10, 4 );

function change_menu_item_css_id( $menu_id, $item, $args, $depth ) {
	return $args->theme_location === 'primary' ? '' : $menu_id;
}

Notes

• The $depth parameter was added in version 4.1.0.