How to change form field value in symfony 2

问题:

I have a form like below:

class ItemType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            // ...
            ->add('tags','text',array(
                'required' => false,
                'attr' => array('name' => 'tags'),
                'mapped' => false))
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'MyBundle\ItemBundle\Entity\Item',
            'cascade_validation' => true,
        ));
    }
}

My edit action

public function editAction(Request $request, $id) {
    $em = $this->getDoctrine()->getManager();
    $entity = $em->getRepository('MyBundleItemBundle:Item')->find($id);
    $form = $this->createForm(new ItemType(), $entity);
    //$form->get('tags')->setValue('test text');
    // ^- this is what i would like to do -^
    // ...
}

While I am editing an item, How can I change form field value inside controller before rendering it?

回答1:

You can use setData() to set data on form fields in Symfony, like this:

$form = $formBuilder->getForm();

$form->get('firstname')->setData('John');

回答2:

You can change tags value in the controller:

$request = $this->get('request');
    if ($request->getMethod() == 'POST') 
{
    $form->bind($request);
    if $form->isValid())
    {
        $entity->setTags('test');
        //persist ...
    }
}

回答3:

class ItemType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ...
            ->add('tags','text',array(
                'required' => false,
                'attr' => array('name' => 'tags','value'=>'newvalue'),
                'mapped' => false))
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'MyBundle\ItemBundle\Entity\Item',
            'cascade_validation' => true,
        ));
    }
}

回答4:

Another way to set the value is to use form options:

class ItemType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            // ...
            ->add('tags','text',array(
                'required' => false,
                'attr' => array('name' => 'tags'),
                'mapped' => false,
                'data' => $options['tags_value'],
            ))
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'MyBundle\ItemBundle\Entity\Item',
            'cascade_validation' => true,
            'tags_value' => 'default value if you want',
        ));
    }

And then in controller:

public function editAction(Request $request, $id) {
    $em = $this->getDoctrine()->getManager();
    $entity = $em->getRepository('MyBundleItemBundle:Item')->find($id);
    $form = $this->createForm(new ItemType(), $entity, ['tags_value' => 'test text']);
}