Symfony twig how to add class to a form row

Question

I am building a project in Symfony 2.3 using Twig. I want to add a class to the form row block. I am using a form theme file which contains:

{% block form_ro         


        

Answer 1

What I did was simpler (though maybe a bit less clean?).

Pass the class for the form row via a field's "data" attribute :

// template.html.twig

{{ form_start(form) }}
    {{ form_row(form.field, {'attr': {'data-row-class': 'my-row-class'} }) }}
{{ form_end(form) }}

And then handle it in the form theme template this way :

// form-theme.html.twig

{% block form_row -%}
    {% set row_class = attr['data-row-class'] | default('') %}
    

        {{- form_label(form) -}}
        {{- form_widget(form) -}}
        {{- form_errors(form) -}}
    
{%- endblock form_row %}

Which gives this :

    

        Field label