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In addition to Chris, I added functionality that child categories will only expand if they are in the selected category.
<?php
/**
Plugin Name: WooCommerce - Exclude empty categories from widget
Plugin URI: https://chrisk.io/woocommerce-hide-categories-with-no-visible-products-in-the-product-category-widget/
Description: Excludes categories with no visible products from the WooCommerce category list
Version: 0.2
Author: Chris Klosowski
Editor: Randall Kam
Author URI: https://chrisk.io
*/
/**
* Exclude categories with no visible products from the category list
*
* @param array $category_list_args Array of wp_list_categories parameters
* @return array Addition of exclude if items are not visible
*/
function get_parent_cats ($cat_termid, $found = array()) {
array_push ($found, $cat_termid);
$term =get_term_by( 'term_id', $cat_termid, 'product_cat');
if($term->parent > 0){
return get_parent_cats($term->parent, $found);
}
return $found;
}
function kfg_exclude_categories_from_widget( $category_list_args ) {
$current_tax = get_query_var( 'product_cat' );
$term =get_term_by( 'slug', $current_tax, 'product_cat');
$term_id = $term->term_id;
$parents = get_parent_cats($term_id);
$args = array(
'hide_empty' => false,
'hierarchical' => true,
);
$product_categories = get_terms( 'product_cat', $args );
$exclude = array();
foreach ( $product_categories as $category ) {
$posts = get_posts( array( 'post_type' => 'product', 'posts_per_page' => -1, 'product_cat' => $category->slug, 'fields' => 'ids' ) );
$show_category = false;
foreach ( $posts as $post ) {
$product = new wC_Product( $post );
$visible_product = $product->is_visible();
if ( true === $visible_product ) {
$show_category = true;
break;
}
}
if ( false === $show_category || ( $category->parent > 0 && !in_array($category->parent,$parents) ) ) {
$exclude[] = $category->term_id;
}
}
if ( ! empty( $exclude ) ) {
$category_list_args['exclude'] = implode( ',', $exclude );
unset( $category_list_args['include'] );
}
return $category_list_args;
}
add_filter( 'woocommerce_product_categories_widget_args', 'kfg_exclude_categories_from_widget', 10, 1 );
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