Your question got me to digging through the ACF code and testing.
Honestly, I can find this line in the acf code
add_action('wp_ajax_acf/fields/taxonomy/query', array($this, 'ajax_query'));
but I don’t see that this line is ever run. This makes me believe that something has changed since that documentation was written, that there is a bug, or that I’m missing something important.
The filters that are applied are when showing checkboxes are these lines in /fields/taxonomy.php line 691
// filter for 3rd party customization
$args = apply_filters('acf/fields/taxonomy/wp_list_categories', $args, $field);
$args = apply_filters('acf/fields/taxonomy/wp_list_categories/name=' . $field['_name'], $args, $field);
$args = apply_filters('acf/fields/taxonomy/wp_list_categories/key=' . $field['key'], $args, $field);
So I tried this and it worked.
function my_taxonomy_query( $args, $field) {
// modify args
//echo 'here'; die;
$args['orderby'] = 'count';
$args['order'] = 'ASC';
// return
return $args;
}
add_filter('acf/fields/taxonomy/wp_list_categories', 'my_taxonomy_query', 10, 2);
I’m going to mark this thread for the developer’s attention and maybe he’ll comment and let us know what’s going on.
