CCT repeater tree callback

// Callback pre JetEngine Dynamic Field – vykreslí vnorený repeater ako strom

add_filter( 'jet-engine/listings/allowed-callbacks', function ( $callbacks ) {

	$callbacks['gruppa_render_terms_tree'] = 'Render terms tree';

	return $callbacks;

} );

function gruppa_render_terms_tree( $items, $child_key = 'terms' ) {

	$items = maybe_unserialize( $items );

	if ( empty( $items ) || ! is_array( $items ) ) {

		return '';

	}

	$html = '<ul class="terms-tree">';

	foreach ( $items as $item ) {

		$item = (array) $item;

		$name = isset( $item['name'] ) ? esc_html( $item['name'] ) : '';

		$slug = isset( $item['slug'] ) ? esc_attr( $item['slug'] ) : '';

		$html .= '<li data-slug="' . $slug . '">' . $name;

		if ( ! empty( $item[ $child_key ] ) ) {

			$html .= gruppa_render_terms_tree( $item[ $child_key ], $child_key );

		}

		$html .= '</li>';

	}

	return $html . '</ul>';

}