with_required_input.php

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<?php

declare(strict_types=1);

namespace ILIAS\UI\examples\Input\Container\Form\Standard;

function with_required_input()
{
    global $DIC;
    $ui = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();
    $request = $DIC->http()->request();

    $text_input = $ui->input()->field()
        ->text("Required Input", "User needs to fill this field")
        ->withRequired(true);

    $section = $ui->input()->field()->section(
        [$text_input],
        "Section with required field",
        "The Form should show an explaining hint at the bottom"
    );

    $DIC->ctrl()->setParameterByClass(
        'ilsystemstyledocumentationgui',
        'example_name',
        'required'
    );
    $form_action = $DIC->ctrl()->getFormActionByClass('ilsystemstyledocumentationgui');

    $form = $ui->input()->container()->form()->standard($form_action, [$section]);

    if ($request->getMethod() == "POST"
        && array_key_exists('example_name', $request->getQueryParams())
            && $request->getQueryParams()['example_name'] == 'required') {
        $form = $form->withRequest($request);
        $result = $form->getData();
    } else {
        $result = "No result yet.";
    }

    return
        "<pre>" . print_r($result, true) . "</pre><br/>" .
        $renderer->render($form);
}