WP_Customize_Nav_Menus::enqueue_scripts() WordPress Method

	public function enqueue_scripts() {
		wp_enqueue_style( 'customize-nav-menus' );
		wp_enqueue_script( 'customize-nav-menus' );

		$temp_nav_menu_setting      = new WP_Customize_Nav_Menu_Setting( $this->manager, 'nav_menu[-1]' );
		$temp_nav_menu_item_setting = new WP_Customize_Nav_Menu_Item_Setting( $this->manager, 'nav_menu_item[-1]' );

		$num_locations = count( get_registered_nav_menus() );

		if ( 1 === $num_locations ) {
			$locations_description = __( 'Your theme can display menus in one location.' );
		} else {
			/* translators: %s: Number of menu locations. */
			$locations_description = sprintf( _n( 'Your theme can display menus in %s location.', 'Your theme can display menus in %s locations.', $num_locations ), number_format_i18n( $num_locations ) );
		}

		// Pass data to JS.
		$settings = array(
			'allMenus'                 => wp_get_nav_menus(),
			'itemTypes'                => $this->available_item_types(),
			'l10n'                     => array(
				'untitled'               => _x( '(no label)', 'missing menu item navigation label' ),
				'unnamed'                => _x( '(unnamed)', 'Missing menu name.' ),
				'custom_label'           => __( 'Custom Link' ),
				'page_label'             => get_post_type_object( 'page' )->labels->singular_name,
				/* translators: %s: Menu location. */
				'menuLocation'           => _x( '(Currently set to: %s)', 'menu' ),
				'locationsTitle'         => 1 === $num_locations ? __( 'Menu Location' ) : __( 'Menu Locations' ),
				'locationsDescription'   => $locations_description,
				'menuNameLabel'          => __( 'Menu Name' ),
				'newMenuNameDescription' => __( 'If your theme has multiple menus, giving them clear names will help you manage them.' ),
				'itemAdded'              => __( 'Menu item added' ),
				'itemDeleted'            => __( 'Menu item deleted' ),
				'menuAdded'              => __( 'Menu created' ),
				'menuDeleted'            => __( 'Menu deleted' ),
				'movedUp'                => __( 'Menu item moved up' ),
				'movedDown'              => __( 'Menu item moved down' ),
				'movedLeft'              => __( 'Menu item moved out of submenu' ),
				'movedRight'             => __( 'Menu item is now a sub-item' ),
				/* translators: ▸ is the unicode right-pointing triangle. %s: Section title in the Customizer. */
				'customizingMenus'       => sprintf( __( 'Customizing ▸ %s' ), esc_html( $this->manager->get_panel( 'nav_menus' )->title ) ),
				/* translators: %s: Title of an invalid menu item. */
				'invalidTitleTpl'        => __( '%s (Invalid)' ),
				/* translators: %s: Title of a menu item in draft status. */
				'pendingTitleTpl'        => __( '%s (Pending)' ),
				/* translators: %d: Number of menu items found. */
				'itemsFound'             => __( 'Number of items found: %d' ),
				/* translators: %d: Number of additional menu items found. */
				'itemsFoundMore'         => __( 'Additional items found: %d' ),
				'itemsLoadingMore'       => __( 'Loading more results... please wait.' ),
				'reorderModeOn'          => __( 'Reorder mode enabled' ),
				'reorderModeOff'         => __( 'Reorder mode closed' ),
				'reorderLabelOn'         => esc_attr__( 'Reorder menu items' ),
				'reorderLabelOff'        => esc_attr__( 'Close reorder mode' ),
			),
			'settingTransport'         => 'postMessage',
			'phpIntMax'                => PHP_INT_MAX,
			'defaultSettingValues'     => array(
				'nav_menu'      => $temp_nav_menu_setting->default,
				'nav_menu_item' => $temp_nav_menu_item_setting->default,
			),
			'locationSlugMappedToName' => get_registered_nav_menus(),
		);

		$data = sprintf( 'var _wpCustomizeNavMenusSettings = %s;', wp_json_encode( $settings ) );
		wp_scripts()->add_data( 'customize-nav-menus', 'data', $data );

		// This is copied from nav-menus.php, and it has an unfortunate object name of `menus`.
		$nav_menus_l10n = array(
			'oneThemeLocationNoMenus' => null,
			'moveUp'                  => __( 'Move up one' ),
			'moveDown'                => __( 'Move down one' ),
			'moveToTop'               => __( 'Move to the top' ),
			/* translators: %s: Previous item name. */
			'moveUnder'               => __( 'Move under %s' ),
			/* translators: %s: Previous item name. */
			'moveOutFrom'             => __( 'Move out from under %s' ),
			/* translators: %s: Previous item name. */
			'under'                   => __( 'Under %s' ),
			/* translators: %s: Previous item name. */
			'outFrom'                 => __( 'Out from under %s' ),
			/* translators: 1: Item name, 2: Item position, 3: Total number of items. */
			'menuFocus'               => __( '%1$s. Menu item %2$d of %3$d.' ),
			/* translators: 1: Item name, 2: Item position, 3: Parent item name. */
			'subMenuFocus'            => __( '%1$s. Sub item number %2$d under %3$s.' ),
		);
		wp_localize_script( 'nav-menu', 'menus', $nav_menus_l10n );
	}