public static function TermReferenceTree::validateTermReferenceTreeElement in Taxonomy Term Reference Tree Widget 8

Form element validation handler for term reference form widget.

File

src/Plugin/Field/FieldWidget/TermReferenceTree.php, line 174

Class

TermReferenceTree

Plugin implementation of the 'term_reference_tree' widget.

Namespace

Drupal\term_reference_tree\Plugin\Field\FieldWidget

Code

public static function validateTermReferenceTreeElement(&$element, FormStateInterface $form_state) {
  $items = _term_reference_tree_flatten($element, $form_state);
  $value = [];
  if ($element['#max_choices'] != 1) {
    foreach ($items as $child) {
      if (!empty($child['#value'])) {

        // If the element is leaves only and select parents is on,
        // then automatically add all the parents of each selected value.
        if (!empty($element['#select_parents']) && !empty($element['#leaves_only'])) {
          foreach ($child['#parent_values'] as $parent_tid) {
            if (!in_array([
              $element['#value_key'] => $parent_tid,
            ], $value)) {
              array_push($value, [
                $element['#value_key'] => $parent_tid,
              ]);
            }
          }
        }
        array_push($value, [
          $element['#value_key'] => $child['#value'],
        ]);
      }
    }
  }
  else {

    // If it's a tree of radio buttons, they all have the same value,
    // so we can just grab the value of the first one.
    if (count($items) > 0) {
      $child = reset($items);
      if (!empty($child['#value'])) {
        array_push($value, [
          $element['#value_key'] => $child['#value'],
        ]);
      }
    }
  }
  if ($element['#required'] && empty($value)) {
    $form_state
      ->setError($element, t('%name field is required.', [
      '%name' => $element['#title'],
    ]));
  }
  $form_state
    ->setValueForElement($element, $value);
}