在symfony2中转换自定义表单类型

<?php
namespace WIC'MasterBundle'Form'Extension;
use Symfony'Component'Form'AbstractTypeExtension;
use Symfony'Component'Form'FormBuilderInterface;
use Symfony'Component'Form'FormView;
use Symfony'Component'Form'FormInterface;
use Symfony'Component'PropertyAccess'PropertyAccess;
use Symfony'Component'OptionsResolver'OptionsResolver;
/**
 * Add a BootStrap Help block to any form field
 */
class HelpTextExtension extends AbstractTypeExtension
{
    /**
     * Returns the name of the type being extended.
     *
     * @return string The name of the type being extended
     */
    public function getExtendedType() {
        return 'form';
    }
    /**
     * Add the help_text option
     *
     * @param OptionsResolver $resolver
     */
    public function configureOptions(OptionsResolver $resolver) {
        $resolver->setDefined(array('help_text'));
        $resolver->setDefault('help', null);
    }
    /**
     * Pass the Help Text to the view
     *
     * @param FormView $view
     * @param FormInterface $form
     * @param array $options
     */
    public function buildView(FormView $view, FormInterface $form, array $options) {
        $view->vars['help_text'] = $form->getConfig()->getAttribute('help_text');
    }
    public function buildForm(FormBuilderInterface $builder, array $options) {
        if (array_key_exists('help_text', $options)) {
            $builder->setAttribute('help_text', $options['help_text']);
        }
    }
}

{% extends 'bootstrap_3_horizontal_layout.html.twig' %}
{% block form_row -%}
    {% spaceless %}
        <div class="form-group{% if (not compound or force_error|default(false)) and not valid %} has-error{% endif %}">
            {{ form_label(form) }}
            <div class="{{ block('form_group_class') }}">
                {{ form_widget(form) }}
                {{ form_errors(form) }}
                {% if help_text is not null %}
                    <span class="help-block">{{ help_text }}</span>
                {% endif %}
            </div>
        </div>
    {% endspaceless %}
{%- endblock form_row %}

您可以像在其他地方一样添加翻译，只需填充标签。

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('title', 'text', [
            'label' => 'rpr.page.title', // <- any string can be there
        ]);
}

默认的翻译域是'messages'，要更改，请添加'translation_domain'到你的configureOptions

public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
       'data_class'         => 'Acme'Entity'DemoEntity',
       'translation_domain' => 'forms'
    ]);
}

当然，您需要在正确的位置创建翻译文件:AcmeBundle'Resources'translations

注意事项:-当你在AcmeBundle'Resources'translations中创建新的翻译文件时，如forms.de.yml，你需要清除缓存，即使在开发中。

docs here: http://symfony.com/doc/current/reference/forms/types/form.html#translation-domain

a)在config.yml中设置区域参数并启用翻译

parameters:
    locale: en
framework:
    #esi:             ~
    translator:      { fallbacks: ["%locale%"] }

b)创建自定义表单类型我从文档中创建了GenderType。

c)用构造函数扩展自定义表单类型，以访问转换器并在需要时使用转换器:

namespace AppBundle'Form'Type;
use Symfony'Component'Form'AbstractType;
use Symfony'Component'OptionsResolver'OptionsResolver;
use Symfony'Component'Translation'Translator;
class GenderType extends AbstractType
{
    private $translator;
    public function __construct(Translator $translator)
    {
        $this->translator = $translator;
    }
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'choices' => array(
                'm' => $this->translator->trans('user.male'),
                'f' => $this->translator->trans('user.female'),
            )
        ));
    }
    public function getParent()
    {
        return 'choice';
    }
    public function getName()
    {
        return 'gender';
    }
}

d)创建您的字段类型作为一个服务

// app/config/services.yml
services:
    app.form.type.gender:
        class: AppBundle'Form'Type'GenderType
        arguments:
            - @translator.default
        tags:
            - { name: form.type, alias: gender }

e)创建一个翻译文件:

// src/AppBundle/Resources/translations/user.en.yml
user:
    creation: Create User
    gender: Gender
    male: Male
    female: Female

f)扩展你的formType(例如UserType)。确保通过在步骤d中创建的"gender"服务别名传递字段类型。还要为每个字段设置标签和translation_domain选项。

// src/AppBundle/Form/UserType.php
namespace AppBundle'Form;
use Symfony'Component'Form'AbstractType;
use Symfony'Component'Form'FormBuilderInterface;
use Symfony'Component'OptionsResolver'OptionsResolverInterface;
use AppBundle'Form'Type'GenderType;
class UserType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('gender', 'gender', array('label' => 'user.gender', 'translation_domain' => 'user'))
            // and more fields
        ;
    }
    /**
     * @param OptionsResolverInterface $resolver
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle'Entity'User'
        ));
    }
    /**
     * @return string
     */
    public function getName()
    {
        return 'appbundle_user';
    }
}

g)将trans_default_domain添加到你的twig模板中，并翻译任何你想翻译的内容。例子:

{% extends '::base.html.twig' %}
{% trans_default_domain 'user' %}
{% block body -%}
    <h1>{{ 'user.creation'|trans }}</h1>
    {{ form(form) }}
{% endblock %}