public function toJsTree(NodeInterface $node, $titleProperty, $currentIdentifier = '', &$string = NULL)
{
if ($string === NULL) {
$string = '<ul>';
}
$liClasses = ['jstree-open'];
if ($node->isRootNode()) {
$liClasses[] = 'root-node';
}
$spanClasses = [];
if ($currentIdentifier == $node->getIdentifier()) {
$spanClasses[] = 'active';
}
$liClass = implode(' ', $liClasses);
$spanClass = implode(' ', $spanClasses);
$title = $node->{$titleProperty};
$id = $node->getIdentifier();
$string .= "\n <li id=\"node-{$id}\" class=\"{$liClass}\"><span class=\"{$spanClass}\">{$title}</span>";
if (count($node->childNodes())) {
$string .= "\n <ul>";
foreach ($node->childNodes() as $child) {
$this->toJsTree($child, $titleProperty, $currentIdentifier, $string);
}
$string .= "\n </ul>";
}
$string .= "</li>";
return $string . "\n</ul>";
}
