/**
* JSON callback for subtree.
*
* @return \Symfony\Component\HttpFoundation\JsonResponse
* JSON object with list of terms.
*/
public function json()
{
$list = array();
$parent = $this->request->get('parent');
$term = $this->entityTypeManager()->getStorage('taxonomy_term')->load($parent);
if ($term) {
$taxonomy_vocabulary = $this->entityTypeManager()->getStorage('taxonomy_vocabulary')->load($term->getVocabularyId());
if ($taxonomy_vocabulary) {
$terms = TaxonomyManagerTree::loadTerms($taxonomy_vocabulary, $parent);
$list = TaxonomyManagerTree::getNestedListJSONArray($terms);
}
}
return new JsonResponse($list);
}
/**
* Helper function that generates the nested list for the JSON array structure.
*/
public static function getNestedListJSONArray($terms)
{
$items = array();
if (!empty($terms)) {
foreach ($terms as $term) {
$item = array('title' => HTML::escape($term->getName()), 'key' => $term->id());
if (isset($term->children) || TaxonomyManagerTree::getChildCount($term->id()) >= 1) {
// If the given terms array is nested, directly process the terms.
if (isset($term->children)) {
$item['children'] = TaxonomyManagerTree::getNestedListJSONArray($term->children);
} else {
$item['lazy'] = TRUE;
}
}
$items[] = $item;
}
}
return $items;
}