Dynamically exclude empty terms from nav menus

Last week a user on WordPress StackExchange inquired about excluding categories from a nav menu on they fly if the category contained no posts. I was able to provide a very simple solution using the wp_get_nav_menu_items action filter and the global $wpdb object [codex]. Today we will expand on this solution slightly to remove empty terms from any taxonomy.

The wp_get_nav_menu_items action filter is applied to the array of menu items in the wp_get_nav_menu_items() function [codex]  and our filter function will receive three arguments, although we’re only going to make use of the first:

  1. $items – the array of menu items
  2. $menu – the menu object
  3. $args – the arguments passed to the wp_get_nav_menu_items() function

First, we’ll access the $wpdb global, which allows us to perform a direct SQL query, and use the get_col method to retrieve an array containing IDs of all empty terms in the database. Then we’ll loop through all of the menu $items and if the menu item is a taxonomy term and the term ID is in the list of empty terms, we’ll remove it.

add_filter( 'wp_get_nav_menu_items', 'gowp_nav_remove_empty_terms', 10, 3 );
function gowp_nav_remove_empty_terms ( $items, $menu, $args ) {
	global $wpdb;
	$empty = $wpdb->get_col( "SELECT term_taxonomy_id FROM $wpdb->term_taxonomy WHERE count = 0" );
	foreach ( $items as $key => $item ) {
		if ( ( 'taxonomy' == $item->type ) && ( in_array( $item->object_id, $empty ) ) ) {
			unset( $items[$key] );
		}
	}
	return $items;
}

 

Dynamically exclude empty terms from nav menus
5 (100%) 1 vote

1 Shares
  • This post was last updated on February 3rd, 2018 at 02:42 pm

This Post Has 6 Comments

  1. Thanks for the code lucas. It worked great for me. Iam using woocommerce categories in navigation, and suppose if the nav has the products which are out of stocks. I also dont want to show the navigation which has out of stock products. Can you please guide me through this. Thanks alot.

Leave a Reply

Your email address will not be published. Required fields are marked *

  • This post was last updated on February 3rd, 2018 at 02:42 pm
X