symfony2: remove widget attributtes - symfony

Question

When I've created a form:
$builder = $this->createFormBuilder();
$form = $builder->add( 'add', 'button')->getForm();
and render it:
<div><button type="button" id="form_add" name="form[add]">Add</button></div>
the attributes type, id and name are created.
I want to erase this attributes but I don't know how to do it. I've tried to do:
$builder = $this->createFormBuilder();
$form = $builder->add( 'add', 'button', array( 'attr' => array() ) )->getForm();
without any success.
How could I do it?
Greetings and thanks

Answer 1

I messed around with this for a while and the closest I could get was to have them render with empty attributes. However, that's because the project I tested with is Symfony 2.0, and in that version it's impossible to completely remove the attributes since Symfony\Component\Form\FormView::$vars is private.
However, in Symfony 2.1 and later, that same property is public so you should be able to modify (or delete) the attributes/vars directly without being constrained by the FormView api.
First, create your own type to represent this "naked button"
src/Your/Bundle/Form/NakedButtonType.php
<?php
namespace Your\Bundle\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormView;
use Symfony\Component\Form\FormInterface;
class NakedButtonType extends AbstractType
{
/**
* (non-PHPdoc)
* #see Symfony\Component\Form.FormTypeInterface::getName()
*/
public function getName()
{
return "naked_button";
}
/**
* (non-PHPdoc)
* #see Symfony\Component\Form.AbstractType::getParent()
*/
public function getParent(array $options)
{
return 'button';
}
/**
* (non-PHPdoc)
* #see Symfony\Component\Form.AbstractType::buildViewBottomUp()
*/
public function buildViewBottomUp(FormView $view, FormInterface $form)
{
// Symfony 2.0
// This will still render the attributes, but they will have no value
$view->set('id', null);
$view->setAttribute('type', null);
// Symfomy >= 2.1
// This *should* remove them completely
unset( $view->vars['id'] );
unset( $view->vars['attr']['type'] );
}
}
Now, tell the service container how to build your type
app/config/config.yml
services:
form.type.naked_button:
class: Your\Bundle\Form\NakedButtonType
tags:
- {name: form.type, alias: naked_button}
Then update your parent form to use your new type instead of the ootb "button" type.
$builder = $this->createFormBuilder();
$form = $builder->add( 'add', 'naked_button')->getForm();
All of that being said...
If you want these buttons w/o any attributes, why not just put them like that directly into your view?
<form>
{{ form_errors(form) }}
{{ form_rest(form) }}
<div>
<button>Add</button>
</div>
</form>
All of this custom type nonsense seems like alot of overhead to render something you clearly don't need Symfony to manage for you.

Answer 2

While not a good idea, I will help you load the gun and shoot yourself in the foot :-)
Create a new Resources/views/Form/fields.html.twig file, and put the following in it:
{% block widget_attributes %}
{% spaceless %}
id="{{ id }}" name="{{ full_name }}"{% if read_only %} readonly="readonly"{% endif %}{% if disabled %} disabled="disabled"{% endif %}{% if required %} required="required"{% endif %}{% if max_length %} maxlength="{{ max_length }}"{% endif %}{% if pattern %} pattern="{{ pattern }}"{% endif %}
{% for attrname, attrvalue in attr %}{% if attrname in ['placeholder', 'title'] %}{{ attrname }}="{{ attrvalue|trans({}, translation_domain) }}" {% else %}{{ attrname }}="{{ attrvalue }}" {% endif %}{% endfor %}
{% endspaceless %}
{% endblock widget_attributes %}
If you really, really want to remove all the attributes on there, you can remove the {% for attrname ... %} line. That will remove the attributes from all form fields. If you add some logic, you can have it apply to just specific fields.
Next step, you need to register your fields helpers. In your app/config/config.yml file, add the following line:
twig:
form:
resources:
- 'SomeBundle:Form:fields.html.twig'