Symfony form builder - how to put form title in h2 selector? - symfony

Question

I want my form title to be displayed in h2 selector. I did something like that but it throws me an error "exception: "An exception has been thrown during the rendering of a template ("Notice: Undefined offset: -1").""
// how should I change THIS part? To change only the main form title/label?
// I made it work somehow but then it changes all labels... Is there some
// selector which allows to style MAIN title of the form?
{% block form_label %}
{% spaceless %}
<h2>{{ form_label(form) }}</h2>
{% endspaceless %}
{% endblock form_label %}
I've heard that I shouldn't put it in my project file in h2 selector just in form template. It's cleaner and even though documentation doesn't forbide that I was encouraged to do it another way and that's how I want to try it.
{% form_theme form 'Forms/base_form.html.twig' %}
{{ form_start(form) }}
{{ form_label(form, 'Project title', { 'label_attr': {'class': 'main-form-label'} }) }}
// so as I shouldn't put all that line in <h2> can I somehow do it in template between {% block form_label %} ?
{{ form_row(form.title, {'label': 'My title'}) }}
{{ form_row(form.isComplete, {'label': 'Dropdown'}) }}
{{ form_row(form.comment, {'label': 'Comment'}) }}
{{ form_row(form.submit, {'label': 'Submit'}) }}
{{ form_end(form) }}
Also... Whats the difference/what should I use - {% block form_label %} or {%- block form_label -%}
My whole template:
{% block form_label %}
{% spaceless %}
<h2>{{ form_label(form) }}</h2>
{% endspaceless %}
{% endblock form_label %}
{% block form_row %}
{% spaceless %}
{{ form_widget(form) }}
{{ form_errors(form) }}
{% endspaceless %}
{% endblock form_row %}
{% block submit_row %}
{% spaceless %}
<div class="col-12">
{{ form_widget(form) }}
</div>
{% endspaceless %}
{% endblock submit_row %}
{% block text_widget %}
{% spaceless %}
<div class="col-12">
<div>
{{ form_label(form) }}
</div>
{{ form_widget(form) }}
</div>
{% endspaceless %}
{% endblock text_widget %}
{% block choice_widget %}
{% spaceless %}
<span>
{{ form_label(form) }}
{% if expanded %}
{{ block('choice_widget_expanded') }}
{% else %}
{{ block('choice_widget_collapsed') }}
{% endif %}
{{ form_errors(form) }}
</span>
{% endspaceless %}
{% endblock choice_widget %}

Answer 1

In case you get stuck somewhere ;)
We use to do it this way (when we want custom rendering).
First, we extend the FormType :
namespace App\Form\Extension;
use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\Form\Extension\Core\Type\FormType;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\OptionsResolver\OptionsResolver;
class FormTypeExtension extends AbstractTypeExtension
{
public function getExtendedType()
{
return FormType::class;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefault('main_title', false);
$resolver->setAllowedTypes('main_title', 'boolean');
}
public function buildView(FormView $view, FormInterface $form, array $options)
{
$view->vars['main_title'] = $options['main_title'];
}
}
Think to register you extension in Symfony !
Then you can use it in your form builder this way :
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add(
'myField',
TextType::class,
array(
'main_title' => true
));
}
Finally, in your template :
{% block form_row -%}
{% spaceless %}
{% if main_title %}
<h2>{{ form_label(form) }}</h2>
{% else %}
{{ form_label(form) }}
{{ form_widget(form) }}
{% endif %}
{% endspaceless %}
{%- endblock form_row %}
Feel free to override that block with your needs ;-)