Defining custom twig form block for errors rendering

问题

I'm trying to define a specific new block for form field errors rendering, keeping form_errors unchanged for common errors rendering.

# Twig Configuration
twig:
  debug:            %kernel.debug%
  strict_variables: %kernel.debug%
    form:
      resources:
        - 'ApplicationMyBundle:Main:form/customFormTheme.html.twig'

In customFormTheme.html.twig I overwrite a few blocks copied from form_div_layout.html.twig plus I added the folloowing new one.

{% block field_errors %}{% spaceless %}
        {% if errors|length > 0 %}
        <ul class="errors">
            {% for error in errors %}
                {% if error.messageTemplate|length %}
                <li class="error">{{ error.messageTemplate|trans(error.messageParameters, 'validators') }}</li>
                {% endif %}
            {% endfor %}
        </ul>
        {% endif %}
{% endspaceless %}{% endblock %}

Then I expect to be able to use this block in my views like this :

 <div>
     {{ form_label(form.message, 'message.label'|trans({},'contact')|raw ) }}
     {{ form_widget(form.message, {attr: {maxlength:1000, size:1000, rows:8}}) }}
     {{ field_errors(form.message) }}
 </div>

but I receive the following error :

The function "field_errors" does not exist. Did you mean "form_errors"

I also tried by naming my block text_errors or textarea_errors mentioned here but I haven't been luckier.

Any idea ?

回答1:

Actually it works by defining the block text_errors or textarea_errors only and still use {{ form_errors(field.name) }} in your template. If a block named after the type of your field exists (according to form field types) it will be used instead of form_errors.

!! But you can't use directly {{ text_errors(field.name) }} in your twig template !!

The same way you can have a custom row for a specific type like this

{% block textarea_row %}{% spaceless %}
    <div class="textarea l-field {{ (form_errors(form)?'error':'') }}">
        {{ form_label(form) }}
        {{ form_widget(form) }}
        {{ form_errors(form) }}
    </div>
{% endspaceless %}{% endblock textarea_row %}

and use it in your template as follow :

{# message has textarea field type #}

{{ form_row(form.message, {
    label: 'message.label'|trans({},'contact')|raw ,
    attr: {maxlength:1000, size:1000, rows:8}})
}}

You can also pass many custom parameters by using the object attr{}

{% block form_row %}
{% spaceless %}
    <div class="form-field {{ (form_errors(form)?'error':'') }}">
        {{ form_label(form) }}
        {{ form_widget(form) }}
        {{ dump(attr) }}
        {% if attr.help is defined and not attr.help == '' %}<p class="form-help">{{ attr.help }}</p>{% endif %}
        {{ form_errors(form) }}
    </div>
{% endspaceless %}
{% endblock form_row %}

and use it like this

{{ form_row(form.message, {
       label: 'message.label'|trans({},'contact')|raw ,
       attr: {
           maxlength:1000, size:1000, rows:8,
           help: 'password.help'|trans({})|raw
       }
   })
}}

来源：https://stackoverflow.com/questions/17533159/defining-custom-twig-form-block-for-errors-rendering