Symfony2 and form theming/customization (required/help/errors) - symfony

Question

Maybe I'm overlooking something, and hopefully this is done very easy.
I have a form and what I want in the end is the following result:
Fields which:
are mandatory/required
have an error currently
have help
should get an extra a-Tag after the label and an extra div, filled with the help and/or the error, if applicable.
What I got to work is, that required fields get the a-Tag by using this:
{% use 'form_div_layout.html.twig' with field_label as base_field_label %}
{% block field_label %}
{{ block('base_field_label') }}
{% if required %}
<span> </span>
{% endif %}
{% endblock %}
So, what I tried already were different versions of this:
{% use 'form_div_layout.html.twig' with field_label as base_field_label %}
{% block field_label %}
{{ block('base_field_label') }}
{% if required or help is defined %}
<span> </span>
{% endif %}
{% endblock %}
{% block field_row %}
{% spaceless %}
<div class="row">
{% if required or help is defined %}
<div>
{{ form_errors(form) }}
{{ help }}
</div>
{% endif %}
{{ form_label(form) }}
{{ form_widget(form, { 'attr': {'class': 'grid_4'} }) }}
</div>
{% endspaceless %}
{% endblock field_row %}
And I can't get this to work.
So my questions are:
Where do I get the help text from, which can also contain HTML? I tried this within the form builder without success - but at least with an exception:
$builder ->add('subject', 'text', array(
'label' => 'Subject',
'help' => 'Can be formatted content with <strong>HTML-Elements</strong>',
));
How can I tell that the current field has an error (to add a class to the row) and if so also display it? {{ form_errors(form) }} did not output anything, no matter where I place it within `field_row˚.

Answer 1

There is no help text, you have to create Form Extension for field and add it to default options.
Example in SF 2.1 Beta 1:
namespace Webility\Bundle\WebilityBundle\Form\Extension;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormViewInterface;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
class HelpFormTypeExtension extends AbstractTypeExtension
{
public function buildView(FormViewInterface $view, FormInterface $form, array $options){
$view->setVar('help', $options['help']);
}
public function getExtendedType(){
return 'field';
}
public function setDefaultOptions(OptionsResolverInterface $resolver) {
$resolver->setDefaults(array(
'help' => null
));
}
}
And register it as a service:
<service id="webility.form.extension.help" class="Webility\Bundle\WebilityBundle\Form\Extension\HelpFormTypeExtension">
<tag name="form.type_extension" alias="field" />
</service>
For the errors question:
Do you have any errors to print? Check that in controller if validation fails:
echo '<pre>'; print_r( $form->getErrorsAsString() ); echo '</pre>'; exit;

Answer 2

To solve it as stated in my question Maciej Pyszyński's anwser was very helpful.
I solved it in this case in another way, which I also want to post here. According to the manual "Adding "help" messages" I build this:
Note This solution won't work together with the formbuilder and needs some tweaking in twig.
To get the help ''-tags (actually they are divs now) …
{% block field_label %}
{{ block('base_field_label') }}
{% if attr.class is defined and '_hint' == attr.class %}
<div>
<a><span class="help">Help Icon</span></a>
<div class="tooltip">
{% if help is defined %}
{{ help|raw }}
{% else %}
Somebody forgot to insert the help message
{% endif %}
</div>
</div>
{% endif %}
{% endblock %}
To get the right class on an error
{% block field_row %}
{% spaceless %}
<div class="row{% if form_errors(form) %} error{% endif %}">
{{ form_label(form) }}
{{ form_widget(form, { 'attr': {'class': 'grid_4'} }) }}
</div>
{% endspaceless %}
{% endblock field_row %}
And the call from the template
<div class="row{% if form_errors(form.url) %} _error{% endif %}">
{{ form_label(form.field, null, { 'attr': {'class': '_hint'}, 'help': 'Help text or variable containing it' }) }}
{{ form_widget(form.field, { 'attr': {'class': 'grid_4'} }) }}
</div>