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Here’s my code if it’s of any help to others.
This is my solution to adding custom fields targeting specifically the children of parent categories.
i.e.:
(Credit to Kellen Mace for the snippet on finding the current category edit page. Link in the code.)
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly
}
class ACF_Category_Name_Location extends ACF_Location {
public function initialize() {
$this->name = 'category_name';
$this->category = __( 'Category', 'acf');
$this->label = __( 'Category Name', 'acf' );
$this->object_type = 'post';
}
public function get_values( $rule ) {
$choices = array();
// Load all category terms, loop over them and append to choices.
$terms = get_terms( array(
'taxonomy' => 'category',
'orderby' => 'name',
'hide_empty' => false,
'parent' => 0,
) );
if( $terms ) {
foreach( $terms as $term ) {
$choices[ $term->term_id ] = $term->name;
}
}
return $choices;
}
public function match( $rule, $screen, $field_group ) {
/**
* https://kellenmace.com/get-term-edited-term-php-wordpress-admin-page/
*/
// Get the term currently being edited on the edit.php screen in the WP admin.
global $taxnow;
if ( ! $taxnow || empty( $_GET['tag_ID'] ) ) {
return false;
}
$term_id = absint( $_GET['tag_ID'] );
$term = get_term( $term_id, $taxnow );
// return false if not and instance of WP_Term
if ( ! $term instanceof WP_Term ) {
return false;
}
// Compare the selected terms parent to rule value.
$result = ( $term->parent == $rule['value'] );
// Return result taking into account the operator type.
if( $rule['operator'] == '!=' ) {
return !$result;
}
return $result;
}
}
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