Reply To: Allow null for multisite taxonomy select

• whodeee

• January 19, 2017 at 4:14 am

Support led me in the right direction – I added a custom validation to that field, works like a charm

//**********Custom Validation for Taxonomy Field
add_filter('acf/validate_value/type=taxonomy', 'my_acf_validate_taxonomy', 10, 4);

function my_acf_validate_taxonomy( $valid, $value, $field, $input ){
	
	// bail early if value is already invalid
	if( !$valid ) {
		return $valid;
	}
	
    $terms = get_terms( array(
        'taxonomy' => $field['taxonomy'],
        'hide_empty' => false,
    ) );
    
	if( count($terms) > 0 ) {
        if(!$value) {
            $valid = 'Please select a category';
        }
	}
	// return
	return $valid;
}