Customize form field rendering

Question

I would like to customize the rendering of a form field in the edit page from sonata admin bundle to include an applet that uses the text content of a field.

I know

Answer 1

user1254498's solution won't work unless the block name prefix matches the name of the form type. At least with the last version of sonata admin bundle (2.2.12). In this case:

{# src/mycompany/myBundle/Resources/views/Form/myfield_edit.html.twig #}
{% block myfield_widget %}
    {% spaceless %}
        {{ block('textarea_widget') }}
    {% endspaceless %}
{% endblock %}

And, regarding getFormTheme(), you shoud return also the parent theme, otherwise you may break the whole style...

public function getFormTheme()
{
    return array_merge(
            parent::getFormTheme(), array(
          'mycompanyBundle:Form:myfield_edit.html.twig')
    );        
}

Also, you can access the admin service in the twig template with the variable sonata_admin.admim.