How can I save a custom field of an attribute in Woocommerce?

Question

Old

I am trying to create a custom field in the product attributes in Woocommerce. This to be able to select if an attribute is highlighted or not. For example:

Answer 1

Check Ink's answer

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Outdated

I have found the solution to my problem. I share the code in case someone is useful. Regards!

add_action('woocommerce_after_product_attribute_settings', 'wcb_add_product_attribute_is_highlighted', 10, 2);
add_action('wp_ajax_woocommerce_save_attributes', 'wcb_ajax_woocommerce_save_attributes', 10);

function get_attribute_highlighted($id, $i) {
    global $post;
    $id = sanitize_title($id);
    $id = strtolower($id);
    $val = get_post_meta( $post->ID, "attribute_".$id."_highlighted_".$i, true);
    return !empty($val) ? $val : false;
}

function wcb_add_product_attribute_is_highlighted($attribute, $i=0) {
    $value = get_attribute_highlighted($attribute->get_name(), $i); ?>
        
            
                

                     name="attribute_highlighted[]" value="1" /> wcb ); ?>
                
            
        
     $val) {
            $attr_name = sanitize_title($data["attribute_names"][$i]);
            $attr_name = strtolower($attr_name);
            update_post_meta( $post_id, "attribute_".$attr_name."_highlighted_".$i, wc_string_to_bool($val) );
        }
    }
}

In the end the only thing I had to add to my code was a hidden input with the same name as the checkbox but with a value of 0:

Here an image of the result (https://i.stack.imgur.com/VscT1.jpg). By clicking on save the value of the checkbox is maintained. The value is saved in a post_meta of the post that you are modifying. This is useful if you want to highlight a specific attribute in the front end.

I appreciate the help of @LoicTheAztec :)