PHP code example of symfonycasts / dynamic-forms

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

symfonycasts / dynamic-forms example snippets

public function buildForm(FormBuilderInterface $builder, array $options): void
{
    $builder = new DynamicFormBuilder($builder);

    $builder->add('meal', ChoiceType::class, [
        'choices' => [
            'Breakfast' => 'breakfast',
            'Lunch' => 'lunch',
            'Dinner' => 'dinner',
        ],
    ]);

    $builder->addDependent('mainFood', ['meal'], function(DependentField $field, string $meal) {
        // dynamically add choices based on the meal!
        $choices = ['...'];

        $field->add(ChoiceType::class, [
            'placeholder' => null === $meal ? 'Select a meal first' : sprintf('What is for %s?', $meal->getReadable()),
            'choices' => $choices,
            'disabled' => null === $meal,
        ]);
    });

use Symfonycasts\DynamicForms\DynamicFormBuilder;
// ...

public function buildForm(FormBuilderInterface $builder, array $options): void
{
    $builder = new DynamicFormBuilder($builder);

    // ...
}

// src/Form/FeedbackForm.php

// ...
use Symfonycasts\DynamicForms\DependentField;
use Symfonycasts\DynamicForms\DynamicFormBuilder;

class FeedbackForm extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder =  new DynamicFormBuilder($builder);

        $builder->add('rating', ChoiceType::class, [
            'choices' => [
                'Select a rating' => null,
                'Great' => 5,
                'Good' => 4,
                'Okay' => 3,
                'Bad' => 2,
                'Terrible' => 1
            ],
        ]);

        $builder->addDependent('badRatingNotes', 'rating', function(DependentField $field, ?int $rating) {
            if (null === $rating || $rating >= 3) {
                return; // field not needed
            }

            $field->add(TextareaType::class, [
                'label' => 'What went wrong?',
                'attr' => ['rows' => 3],
                'help' => sprintf('Because you gave a %d rating, we\'d love to know what went wrong.', $rating),
            ]);
        });
    }
}

diff
// src/Form/FeedbackForm.php

// ...

class FeedbackForm extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder =  new DynamicFormBuilder($builder);

        $builder->add('rating', ChoiceType::class, [
            'choices' => [
                'Select a rating' => null,
                'Great' => 5,
                'Good' => 4,
                'Okay' => 3,
                'Bad' => 2,
                'Terrible' => 1
            ],
+           // This will allow the form to auto-submit on value change
+           'attr' => ['onchange' => 'this.form.requestSubmit()'],
        ]);
+       // This will allow to differenciate between a user submition and an auto-submit
+       $builder->add('submit', SubmitType::class, [
+           'attr' => ['value' => 'submit'], // Needed for Turbo
+       ]);

        $builder->addDependent('badRatingNotes', 'rating', function(DependentField $field, ?int $rating) {
            if (null === $rating || $rating >= 3) {
                return; // field not needed
            }

            $field->add(TextareaType::class, [
                'label' => 'What went wrong?',
                'attr' => ['rows' => 3],
                'help' => sprintf('Because you gave a %d rating, we\'d love to know what went wrong.', $rating),
            ]);
        });
    }
}

diff
// src/Controller/FeedbackController.php

    #[Route('/feedback', name: 'feedback')]
    public function feedback(Request $request): Response
    {
        //...

-       $feedbackForm = $this->createForm(FeedbackForm::class);
+       $feedbackForm = $this->createForm(FeedbackForm::class, options: [
+           // This is needed by Turbo Frame, it is not specific to Dependent Symfony Form Fields
+           'action' => $this->generateUrl('feedback'),
+       ]);
        $feedbackForm->handleRequest($request);
        if ($feedbackForm->isSubmitted() && $feedbackForm->isValid()) {

+           /** @var SubmitButton $submitButton */
+           $submitButton = $feedbackForm->get('submit');
+           if (!$submitButton->isClicked()) {
+               return $this->render('feedback.html.twig', ['feedbackForm' => $feedbackForm]);
+           }

            // Your code here
            // ...

            return $this->redirectToRoute('home');
        }

        return $this->render('feedback.html.twig', ['feedbackForm' => $feedbackForm]);
    }