修改Symfony表单html属性/覆盖单个属性

Question

我试图弄清楚如何使用Symfony2表单动态修改html属性.

这种情况是大多数时间使用默认占位符的情况,但有时,开发人员需要编写自定义消息.

我的表单类型如下所示:

    <?php

    namespace My\AwesomeBundle\FormType;

    use Symfony\Component\Form\AbstractType;
    use Symfony\Component\Form\FormBuilderInterface;
    use Symfony\Component\OptionsResolver\OptionsResolverInterface;
    use My\AwesomeBundle\Transformer\ProcedureCodeTransformer;

    class ProcedureType extends AbstractType
    {

        private $em;
        private $user;


        public function __construct($em, $securityContext)
        {
            $this->em=$em;
            $this->user=$securityContext->getToken()->getUser();
        }

        public function buildForm(FormBuilderInterface $builder, array $options)
        {
            $transformer = new ProcedureTransformer( $this->em );
            $builder->addModelTransformer( $transformer );
        }

        public function setDefaultOptions(OptionsResolverInterface $resolver)
        {
            $user = $this->user;
            $resolver->setDefaults(
                array(
                    'class'       => 'My\AwesomeBundle\Entity\Procedure',
                    'label'       => 'Procedure',
                    'label_attr'  => array( 'class'=> 'control-label' ),
                    'required'    => false,
                    'empty_value' => '',

                    'attr'        => array(
                        'class'                    => 's2',
                        'data-select2-placeholder' => 'Select Procedure',
                    ),
                )
            );

            $resolver->setOptional( array( 'placeholder' ) );
        }

        public function getParent() {
            return 'hidden';
        }

        public function getName() {
            return 'procedure';
        }
    }

然后,默认渲染对data-select2-placeholder元素具有"Select Procedure",javascript用于显示它.然后将其用于更复杂的类型:

    <?php

    namespace My\AwesomeBundle\FormType;

    use Symfony\Component\Form\AbstractType;
    use Symfony\Component\Form\FormBuilderInterface;
    use Symfony\Component\OptionsResolver\OptionsResolverInterface;

    class ProcedureType extends AbstractType
    {
        public function buildForm(FormBuilderInterface $builder, array $options){
            $builder->add('biller', 'billers', array( 'placeholder' => 'New Text'));

            [...]

        }

        public function setDefaultOptions(OptionsResolverInterface $resolver){
            $resolver->setDefaults( array(
                    'data_class' => 'My\AwesomeBundle\Entity\Procedure'
                ) );
        }

        public function getName(){
            return 'my_awesomebundle_proceduretype';
        }
    }

我希望将"新文本"放入data-select2-placeholder html属性中.但是,如果我像这样调用构建器:

    $builder->add('procedure',
        new ProcedureCodeType()),
        array( 'attr' => array('data-select2-placeholder' => 'New Text') ) 
    );

整个html属性数组被替换.这并不奇怪.表单构建器中是否有一个函数让我无法添加或修改单个html属性？

Answer 1

不幸的是,没有办法按照你想要的方式修改单个attr.这是我可以提供的最接近,最简单的解决方案:

在您的情况下您需要做的是在您的选项中使用回调函数.

对于表单类型中的每个默认属性,您可以使用一个回调函数来接受表示您的选项的单个输入(Symfony类Symfony\Component\OptionsResolver\Options),而不是正常值.构建表单时调用该函数,然后将返回值用作选项的值.

这样,您可以根据其他提供的选项构建结果选项.一个例子:

use Symfony\Component\OptionsResolver\Options;

class ProcedureType extends AbstractType
{
    ...

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $attr = function(Options $options) {
            $default = array(
                'class'                    => 's2',
                'data-select2-placeholder' => 'Select Procedure',
            );
            return array_replace($default, $options['new_attr']);
        };

        $user = $this->user;
        $resolver->setDefaults(
            array(
                'class'       => 'My\AwesomeBundle\Entity\Procedure',
                'label'       => 'Procedure',
                'label_attr'  => array( 'class'=> 'control-label' ),
                'required'    => false,
                'empty_value' => '',
                'attr'        => $attr,
                'new_attr'    => array(),
            )
        );

        $resolver->setOptional( array( 'placeholder' ) );
    }

那样,你必须修改的是new_attr.