wp_nav_menu_item_custom_fields
Action Hook: Fires just before the move buttons of a nav menu item in the menu editor.
Source: wp-admin/includes/class-walker-nav-menu-edit.php:251
Walker_Nav_Menu_Edit
Class: Create HTML list of nav menu input items.
Source: wp-admin/includes/class-walker-nav-menu-edit.php:17
Walker_Nav_Menu_Edit::start_lvl()
Method: Starts the list before the elements are added.
Source: wp-admin/includes/class-walker-nav-menu-edit.php:29
Walker_Nav_Menu_Edit::end_lvl()
Method: Ends the list of after the elements are added.
Source: wp-admin/includes/class-walker-nav-menu-edit.php:42
Walker_Nav_Menu_Edit::start_el()
Method: Start the element output.
Source: wp-admin/includes/class-walker-nav-menu-edit.php:60