Stop Drupal Commerce automatically adding hyphens before product variations radio button labels

Question

Using Drupal Commerce I have created product variations with attributes that correspond to my taxonomies. When I use radio buttons to allow the user to select a specific variation Drupal Commerce adds a hyphen to the start the radio button label. For example my taxonomy term is 'White gold' but the radio button label that is displayed is '-White gold'.

How do I stop these hyphens from being added?

Answer 1

These hyphens are not being added by Drupal Commerce itself, so you'll need to look into what other modules on the site might be interacting with the form.

Answer 2

It's probably an effect of the use of nested taxonomy terms there. In particular the function

taxonomy_allowed_values

/**
 * Returns the set of valid terms for a taxonomy field.
 *
 * @param $field
 *   The field definition.
 * @return
 *   The array of valid terms for this field, keyed by term id.
 */
function taxonomy_allowed_values($field) {
  $options = array();
  foreach ($field['settings']['allowed_values'] as $tree) {
    if ($vocabulary = taxonomy_vocabulary_machine_name_load($tree['vocabulary'])) {
      if ($terms = taxonomy_get_tree($vocabulary->vid, $tree['parent'])) {
        foreach ($terms as $term) {
          $options[$term->tid] = str_repeat('-', $term->depth) . $term->name;
        }
      }
    }
  }
  return $options;
}

This part here:

$options[$term->tid] = str_repeat('-', $term->depth) . $term->name;

Adds a hyphen prefix to the term based on the term depth in the vocabulary.

It's called by taxonomy_options_list

You could actually add your own option_list function by adding this to the term_reference field settings:

$field['settings']['options_list_callback'] = 'my_module_taxonomy_options_list';

Alternatively you may be able to form_alter them out from display with

hook_form_commerce_add_to_cart_form_alter(&$form, &$form_state);