Set widget container attributes dynamically

Question

I'm busy with templating my forms inside Symfony 2.0.

It is possible to add attributes to a formfield like this:

$form->add('name', 'text', array('attr' => array('class' => 'my_class')));

But how can I dynamically add attributes to the formfield widget? If i look to the form_div_layout.html.twig content, their is a

{{ block('widget_container_attributes') }}

which can load attributes, but I have no idea where I can add attributes to my FormBuilder in the Controller. Could anyone help me?

Thx!

Answer 1

You should do that in twig layer:

{{ form_row(form.name, {attr: {class: 'my_class'}}) }}