function _webform_edit_grid_unique_validate in Webform 7.4

A Form API element validate function to check that all choices are unique.

1 string reference to '_webform_edit_grid_unique_validate'

_webform_render_grid in components/grid.inc

Implements _webform_render_component().

File

components/grid.inc, line 645

Webform module grid component.

Code

function _webform_edit_grid_unique_validate($element) {

  // Grids may contain nested multiple value select components.
  // Create a flat array of values.
  $values = array();
  $element['#value'] = (array) $element['#value'];
  array_walk_recursive($element['#value'], function ($a) use (&$values) {
    $values[] = $a;
  });
  $nr_unique = count(array_unique($values));
  $nr_values = count($values);
  $nr_possible = count($element['#grid_options']);
  if (strlen($element['#grid_default']) && isset($element['#grid_options'][$element['#grid_default']])) {

    // A default is defined and is one of the options. Don't count default values
    // toward uniqueness.
    $nr_defaults = count(array_keys($element['#value'], $element['#grid_default']));
    if ($nr_defaults) {
      $nr_values -= $nr_defaults;
      $nr_unique--;
    }
  }
  if ($nr_unique < $nr_values && $nr_unique < $nr_possible) {

    // Fewer unique values than values means that at least one value is duplicated.
    // Fewer unique values than possible values means that there is a possible choice
    // that wasn't used.
    form_error($element, t('!title is not allowed to have the same answer for more than one question.', array(
      '!title' => $element['#title'],
    )));
  }
}