/**
* Set custom attributes to use hyperlinked URLs
* See for examples: https://nicola.blog/2016/03/11/make-product-attributes-linkable/
*****************************************************************************************/
/**
* Register term fields
*/
add_action( ‘init’, ‘register_attributes_url_meta’ );
function register_attributes_url_meta() {
$attributes = wc_get_attribute_taxonomies();

foreach ( $attributes as $tax ) {
$name = wc_attribute_taxonomy_name( $tax->attribute_name );

add_action( $name . '_add_form_fields', 'add_attribute_url_meta_field' );
add_action( $name . '_edit_form_fields', 'edit_attribute_url_meta_field', 10 );
add_action( 'edit_' . $name, 'save_attribute_url' );
add_action( 'create_' . $name, 'save_attribute_url' );
}

}

/**
* Add term fields form
*/
function add_attribute_url_meta_field() {

wp_nonce_field( basename( __FILE__ ), 'attrbute_url_meta_nonce' );
?>

<div class="form-field">
<label for="attribute_url"><?php _e( 'URL', 'domain' ); ?></label>
<input type="url" name="attribute_url" id="attribute_url" value="" target="_blank"/>
</div>
<?php

}
/**
* Edit term fields form
*/
function edit_attribute_url_meta_field( $term ) {
$url = get_term_meta( $term->term_id, ‘attribute_url’, true );
wp_nonce_field( basename( FILE ), ‘attrbute_url_meta_nonce’ );
?>

<input type="url" name="attribute_url" id="attribute_url" target="_blank" value="” />

<?php
}
/**
* Save term fields
*/
function save_attribute_url( $term_id ) {
if ( ! isset( $_POST[‘attribute_url’] ) || ! wp_verify_nonce( $_POST[‘attrbute_url_meta_nonce’], basename( FILE ) ) ) {
return;
}
$old_url = get_term_meta( $term_id, ‘attribute_url’, true );
$new_url = esc_url( $_POST[‘attribute_url’] );
if ( ! empty( $old_url ) && $new_url === ” ) {
delete_term_meta( $term_id, ‘attribute_url’ );
} else if ( $old_url !== $new_url ) {
update_term_meta( $term_id, ‘attribute_url’, $new_url, $old_url );
}
}
/**
* Show term URL
*/
add_filter( ‘woocommerce_attribute’, ‘make_product_atts_linkable’, 10, 3 );
function make_product_atts_linkable( $text, $attribute, $values ) {
$new_values = array();
foreach ( $values as $value ) {
if ( $attribute[‘is_taxonomy’] ) {
$term = get_term_by( ‘name’, $value, $attribute[‘name’] );
$url = get_term_meta( $term->term_id, ‘attribute_url’, true );
if ( ! empty( $url ) ) {
$val = ‘‘ . $value . ‘‘;
array_push( $new_values, $val );
} else {
array_push( $new_values, $value );
}
} else {
$matched = preg_match_all( “/[([^]]+)](([^)]+))/”, $value, $matches );
if ( $matched && count( $matches ) == 3 ) {
$val = ‘‘ . sanitize_text_field( $matches[1][0] ) . ‘‘;
array_push( $new_values, $val );
} else {
array_push( $new_values, $value );
}
}
}
$text = implode( ‘, ‘, $new_values );
return $text;