setting target attribute of form in Symfony2 FormBuilder

Question

I need to set my form's target attribute in Symfony2 using FormBuilder .
I tried this:

$fb = $this->createFormBuilder();
$fb->setAttribute('target', '_top');

but it doesnt work!
Why?
How can I do this?

Answer 1

Try to pass it as a constructor argument (among options) as such:

$fb = $this->createFormBuilder(null, array('attr' => array('target' => '_top')));

Remember to pass your form model data (if any) as first argument.

Answer 2

Expanding on Debreczeni's answer; you can define the default options in your form class:

use Symfony\Component\OptionsResolver\OptionsResolver;

public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
        'attr' => [
            'target' => '_top',
        ],
    ]);
}