How to render dynamic symfony form?
1 answer
by
brandy ,
2 years ago
@lew
To render a dynamic Symfony form, you can follow these steps:
- Create a Form Type: Start by creating a form type class that extends the AbstractType class. Inside this class, define the form fields and their options.
- Add dynamic form fields: To add dynamic form fields, you can make use of the FormEvents::PRE_SET_DATA event listener. In the event listener, modify the form based on the data passed to it. You can add or remove form fields dynamically.
- Bind the form type to a form: In your controller, create an instance of the form type and pass it to the createForm method along with the data. This will create a form object that you can render in your template.
- Render the form in the template: In your template file, you can render the form by using the form_start(form) and form_end(form) functions. Use the form_widget(form.fieldName) function to render individual form fields.
Here's an example that demonstrates these steps:
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// Form Type
use SymfonyComponentFormAbstractType;
use SymfonyComponentFormExtensionCoreTypeTextType;
use SymfonyComponentFormFormBuilderInterface;
use SymfonyComponentFormFormEvent;
use SymfonyComponentFormFormEvents;
class MyFormType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', TextType::class)
->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
$form = $event->getForm();
$data = $event->getData();
if ($data && $data->getFieldType() === 'dynamic') {
$form->add('dynamicField', TextType::class);
}
});
}
}
|
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// Controller
use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
class MyController extends AbstractController
{
public function index(Request $request)
{
$data = new MyData();
$form = $this->createForm(MyFormType::class, $data);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
// Process form data
}
return $this->render('my-template.html.twig', [
'form' => $form->createView(),
]);
}
}
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{# my-template.html.twig #}
{{ form_start(form) }}
{{ form_widget(form.name) }}
{{ form_widget(form.dynamicField) }}
{{ form_end(form) }}
|
In the example above, the "dynamicField" is added to the form only when the provided data has a "fieldType" attribute set to "dynamic".