根据Symfony 5中另一个字段中的用户选择值动态填充字段

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\OptionsResolver\OptionsResolver;

class YourFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('field1')
            ->add('field2')
            ->add('field3');

        $builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
            $form = $event->getForm();
            $data = $event->getData();

            // 根据field1的值动态填充field2的选项
            if ($data && $data->getField1() === 'value1') {
                $form->add('field2', ChoiceType::class, [
                    'choices' => [
                        'Option 1' => 'option1',
                        'Option 2' => 'option2',
                    ],
                ]);
            } else {
                $form->add('field2', ChoiceType::class, [
                    'choices' => [
                        'Option 3' => 'option3',
                        'Option 4' => 'option4',
                    ],
                ]);
            }
        });
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => YourEntity::class,
        ]);
    }
}

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class YourController extends AbstractController
{
    /**
     * @Route("/your-route", name="your_route")
     */
    public function yourAction(Request $request)
    {
        $yourEntity = new YourEntity();
        $form = $this->createForm(YourFormType::class, $yourEntity);

        $form->handleRequest($request);
        if ($form->isSubmitted() && $form->isValid()) {
            // 处理表单提交逻辑
        }

        return $this->render('your_template.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}