解决方案很简单,如果您希望自定义选项在 Twig 模板中也可用,则必须使用$builder->setAttribute()
in buildForm
方法
和$view->set()
中的方法buildView()
方法也。
<?php
namespace Acme\DemoBundle\Form\Type;
use Symfony\Component\Form\AbstractType as FormAbstractType;
use Symfony\Component\Form\FormBuilder;
use Symfony\Component\Form\FormView;
use Symfony\Component\Form\FormInterface;
// For Symfony 2.1 and higher:
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
/**
* ImagePreviewType
*
*/
class ImagePreviewType extends FormAbstractType
{
/**
* {@inheritDoc}
* For Symfony 2.0
*/
//public function getDefaultOptions(array $options)
//{
// $options = parent::getDefaultOptions($options);
// $options['base_path'] = 'path/to/default/dir/';
//
// return $options;
//}
/**
* {@inheritDoc}
* For Symfony 2.1 and higher
*/
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'base_path' => '',
));
}
/**
* {@inheritDoc}
*/
public function buildView(FormView $view, FormInterface $form, array $options)
{
// For Symfony 2.0:
// $view->set('base_path', $form->getAttribute('base_path'));
// For Symfony 2.1 and higher:
$view->vars['base_path'] = $options['base_path'];
}
/**
* {@inheritDoc}
*/
public function buildForm(FormBuilder $builder, array $options)
{
$builder
->setAttribute('base_path', $options['base_path'])
;
}
/**
* {@inheritDoc}
*/
public function getName()
{
return 'image_preview';
}
public function getParent(array $options)
{
// for Symfony 2.0:
// return 'field';
// for Symfony 2.1 and higher:
return 'form';
}
}
自定义表单类型的模板(文件...Acme/DemoBundle/Resources/views/Form/fields.html.twig):
{% block image_preview_widget %}
{% spaceless %}
<img src="{{ base_path ~ value }}" alt="" {{ block('widget_container_attributes') }} />
{% endspaceless %}
{% endblock %}
在 app/config/config.yml 中注册自定义表单类型的模板
twig:
debug: %kernel.debug%
strict_variables: %kernel.debug%
form:
resources:
- 'AcmeDemoAdminBundle:Form:fields.html.twig'
用法:在编辑用户个人资料时显示用户图像的预览:
// src/Acme/DemoBundle/Form/Type/UserType.php
namespace Acme\DemoBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;
class UserType extends AbstractType
{
public function buildForm(FormBuilder $builder, array $options)
{
$builder->add('user_profile_image_file_name', new ImagePreviewType(), array(
'base_path' => 'some/other/dir',
));
}
}
2014-08-18:更新为 Symfony 2.1 或更高版本