with_required.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\UI\examples\Input\Field\TreeSelect;
 
use ILIAS\UI\Component\Input\Field\Node\NodeRetrieval;
use ILIAS\UI\Component\Input\Field\Node\Factory as NodeFactory;
use ILIAS\UI\Component\Input\Field\Node\Node;
use ILIAS\UI\Component\Symbol\Icon\Factory as IconFactory;
 
function with_required(): string
{
    global $DIC;
 
    $factory = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();
 
    $node_retrieval = new class () implements NodeRetrieval {
        public function getNodes(
            NodeFactory $node_factory,
            IconFactory $icon_factory,
            ?string $parent_id = null,
        ): \Generator {
            yield from [];
        }
        public function getNodesAsLeaf(
            NodeFactory $node_factory,
            IconFactory $icon_factory,
            array $node_ids,
        ): \Generator {
            yield from [];
        }
    };
 
    $input = $factory->input()->field()->treeSelect(
        $node_retrieval,
        "select a single node",
        "this field should be marked as required.",
    );
 
    $input = $input->withRequired(true);
 
    $form = $factory->input()->container()->form()->standard('#', [$input]);
 
    return $renderer->render($form);
}