related-products-macros.php

<?php

add_filter( 'jet-engine/listings/macros-list', 'jet_register_custom_macros' );
add_filter( 'jet-engine/listing/grid/widget-hide-options', 'jet_add_related_hide_option' );

/**
 * Add new macros to default macros list
 *
 * %jet_related_products% - macros name
 *
 */
function jet_register_custom_macros( $macros_list ) {
	$macros_list['jet_related_products'] = 'jet_related_products';
	return $macros_list;
}

/**
 * Add jet_hide_if_no_related callback into widget hide options.
 *
 * @param  array $options Existing options list
 * @return array
 */
function jet_add_related_hide_option( $options ) {

	$options['jet_hide_if_no_related'] = __( 'Hide if no related', 'text-domain' );
	return $options;

}

/**
 * Hide Listing Grid widget if no related products.
 * Return true if widget should be visible and false if hidden.
 *
 * @return boolean
 */
function jet_hide_if_no_related() {

	$related = jet_related_products();

	if ( ! $related ) {
		return false;
	} else {
		return true;
	}

}

/**
 * Macros callback function
 */
function jet_related_products() {

	$result   = array();
	$products = get_post_meta( get_the_ID(), 'related-products-list', true );

	if ( ! $products ) {
		return '';
	}
	foreach ($products as $product) {
		if ( ! empty( $product['product_sku'] ) ) {
			$result[] = $product['product_sku'];
		}

	}
	return implode( ',', $result );
}