MultiSelect.php

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<?php

declare(strict_types=1);

namespace ILIAS\UI\Implementation\Component\Input\Field;

use ILIAS\UI\Component as C;
use ILIAS\Data\Factory as DataFactory;
use ILIAS\Refinery\Constraint;
use Closure;

class MultiSelect extends FormInput implements C\Input\Field\MultiSelect
{
    protected array $options = [];

    public function __construct(
        DataFactory $data_factory,
        \ILIAS\Refinery\Factory $refinery,
        string $label,
        array $options,
        ?string $byline
    ) {
        parent::__construct($data_factory, $refinery, $label, $byline);
        $this->options = $options;
    }

    public function getOptions(): array
    {
        return $this->options;
    }

    protected function isClientSideValueOk($value): bool
    {
        if (is_null($value)) {
            return true;
        }
        if (is_array($value)) {
            foreach ($value as $v) {
                if (!array_key_exists($v, $this->options)) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    protected function getConstraintForRequirement(): ?Constraint
    {
        if ($this->requirement_constraint !== null) {
            return $this->requirement_constraint;
        }

        return $this->refinery->custom()->constraint(
            fn($value) => is_array($value) && count($value) > 0,
            "Empty"
        );
    }

    public function getUpdateOnLoadCode(): Closure
    {
        return fn($id) => "var checkedBoxes = function() {
                                var options = [];
                                $('#$id').find('li').each(function() {
                                    if ($(this).find('input').prop('checked')) {
                                            options.push($(this).find('span').text());
                    }
                                });
                                return options.join(', ');
                        }
                        $('#$id').on('input', function(event) {
                                il.UI.input.onFieldUpdate(event, '$id', checkedBoxes());
                        });
                        il.UI.input.onFieldUpdate(event, '$id', checkedBoxes());
                        ";
    }

    public function isComplex(): bool
    {
        return true;
    }
}