Get parent form field-value inside Fieldset-validator

Questions Components & MVC
1

Hello, what is the suggested way to get parent form values inside validators of fieldset?

basic idea:

  • parent form has field parentField
  • form has collection of fieldset
  • depending to this parentField-value of parent form we should validate fieldset using DIFFERENT logic

how to accomplish this?

namespace Application\Form;

use Laminas\Form\Form;
use Laminas\Form\Element\Collection;
use Laminas\Form\Element\Text;
use Laminas\InputFilter\InputFilterProviderInterface;

class ParentForm extends Form implements InputFilterProviderInterface
{
    public function __construct($name = null)
    {
        parent::__construct($name);

        $this->add([
            'name' => 'parentField',
            'type' => Text::class,
            'options' => [
                'label' => 'Parent Field',
            ],
        ]);

        $this->add([
            'name' => 'fieldsetCollection',
            'type' => Collection::class,
            'options' => [
                'label' => 'Fieldset Collection',
                'count' => 2,
                'should_create_template' => true,
                'target_element' => [
                    'type' => FieldsetExample::class,
                ],
            ],
        ]);
    }

    public function getInputFilterSpecification()
    {
        return [
            'parentField' => [
                'required' => true,
                'filters'  => [
                    ['name' => 'StringTrim'],
                    ['name' => 'StripTags'],
                ],
                'validators' => [
                    [
                        'name' => 'NotEmpty',
                    ],
                ],
            ],
        ];
    }
}


namespace Application\Form;

use Laminas\Form\Fieldset;
use Laminas\Form\Element\Text;
use Laminas\InputFilter\InputFilterProviderInterface;

class FieldsetExample extends Fieldset implements InputFilterProviderInterface
{
    public function __construct($name = null)
    {
        parent::__construct($name);

        $this->add([
            'name' => 'childField',
            'type' => Text::class,
            'options' => [
                'label' => 'Child Field',
            ],
        ]);
    }

    public function getInputFilterSpecification()
    {
        return [
            'childField' => [
                'required' => true,
                'filters'  => [
                    ['name' => 'StringTrim'],
                    ['name' => 'StripTags'],
                ],
                'validators' => [
                    [
                        'name' => 'Callback',
                        'options' => [
                            'callback' => [$this, 'validateChildField'],
                        ],
                    ],
                ],
            ],
        ];
    }

    public function validateChildField($value, $context, $options)
    {

        $parentFieldValue = *** HERE we should get parent form field value ***

        # example of validation logic
        if ($value !== $parentFieldValue) {
            return false;
        }

        return true;
    }
}

thanks!

2

This will not work because a fieldset has no knowledge of the parent element.

You can overwrite the setData method of the form and modify the input filter according to the passed values.