將驗證器添加到自定義表單類型

Question

如何將驗證器添加到自定義表單類型？ IBAN爲例。

use Symfony\Component\Validator\Constraints\IbanValidator; 

class IBANType extends AbstractType 
{ 
    public function getName() 
    { 
     return 'iban'; 
    } 

    public function getParent() 
    { 
     return 'text'; 
    } 

    public function buildForm(FormBuilderInterface $builder, array $options) 
    { 
     //IbanValidator ??? 
    } 
} 

Here他們建議使用監聽器：

The interface FormValidatorInterface was deprecated and will be removed in Symfony 2.3.

If you implemented custom validators using this interface, you can substitute them by event listeners listening to the FormEvents::POST_BIND (or any other of the *BIND events). In case you used the CallbackValidator class, you should now pass the callback directly to addEventListener.

怎麼會呢？

Answer 1

試試這個：

use Symfony\Component\Validator\Constraints\IbanValidator; 

class IBANType extends AbstractType 
{ 
    public function buildForm(FormBuilderInterface $builder, array $options) 
    { 
     $builder->add('iban', 'text', [ 
      'constraints' => [ 
       new IbanValidator(), 
      ], 
     ]); 
    } 
}