Laminas Form and Element Select with parameter from database

Questions Components & MVC
1

Hi,

I have a form for creating and editing a Product. My problem is to pass a database derived variable to the form and select element. When editing a product, the user can select from a dropdown list the number of sub-products displayed (this number comes from a count of sub-products from the repository and must be called with the product_id parameter). The form needs to receive the parameter with the number and build a select element based on it. Have any of you done something similar and can share an example?

Greetings and thank you for your help.

2

Hello and welcome to our forums! :smiley:

Do you use laminas-form as stand-alone solution or in a laminas-mvc based application?

3

I use an application based on laminas-mvc.

4

Just add a call to your model in the form to get the array of options when you define the dropdown in the form.

5

That would not solve the task with the product_id.

6

A form can be created by passing config to a factory. This is based on laminas-servicemanager’s build method.

Short example that illustrates the usage for your case:

Controller

class ExampleController extends Laminas\Mvc\Controller\AbstractActionController
{
    private Laminas\Form\FormElementManager $formElementManager;

    // …

    public function indexAction()
    {
        // Fetch product ID from request or query string or …
        $productId = '…';

        $form = $this->formElementManager->build(
            ExampleForm::class,
            [
                'product_id' => $productId,
            ]
        );
    }
}

Factory for Form

class ExampleFormFactory implements Laminas\ServiceManager\Factory\FactoryInterface
{
    public function __invoke(
        Interop\Container\ContainerInterface $container,
        $requestedName,
        array $options = null
    ) {
        $form = new ExampleForm();
        if (is_array($options)) {
            $form->setOptions($options);
        }

        return $form;
    }
}

Form

class ExampleForm extends Laminas\Form\Form
{
    public function init(): void
    {
        $productId = $this->getOption('product_id');
        if ($productId !== null) {
            $this->add(
                [
                    'type'    => SubProductElement::class,
                    'options' => [
                        'product_id' => $productId,
                    ],
                ]
            );
        }
    }
}

The list of sub-products should be created as a separate element and the option product_id can be used there.

See also:

1 Like