Symfony2 - 动态表单选择 - 验证删除 [英] Symfony2 - Dynamic form choices - validation remove

问题描述

我有一个下拉式表单元素。最初它开始是空的，但是在用户做了一些交互之后，它通过javascript填充了值。这一切工作正常。但是，当我提交它时总会返回一个验证错误此值无效。。

如果我将项目添加到表单代码中的选项列表中，它将验证OK，但是我试图动态填充它，并且预先将项目添加到选项列表中不去上班。

我认为这个问题是因为表单正在对一个空的项目列表进行验证。我不希望它根据列表进行验证。我已将验证设置为false。

这将仅针对添加到选择列表中的空行或项目进行验证

p>

  $ builder-> add（'verified_city'，'choice'，array（$ b $''required'=> false 
））; 
  

类似的问题在这里没有回答。



<如果你不知道所有可用的选择是什么。它可以从外部Web源加载？

解决方案

在尝试查找它之后花了很多时间。你基本上需要添加一个 PRE_BIND 侦听器。在绑定可供验证的值之前添加一些额外选项。

 使用Symfony \Component\Form\AbstractType ; 
使用Symfony \Component\Form\FormEvents; 
使用Symfony \Component\Form\FormEvent; 
 
 
 public function buildForm（FormBuilderInterface $ builder，array $ options）
 {
 
 // ..在顶部创建表单代码
 
 $ ff = $ builder-> getFormFactory（）; 
 
 //函数动态添加'template'选择字段
 $ func = function（FormEvent $ e）use（$ ff）{
 $ data = $ e->的getData（）; 
 $ form = $ e-> getForm（）; 
 if（$ form-> has（'verified_city'））{
 $ form-> remove（'verified_city'）; 
} 
 
 
 //这有助于确定可用城市的列表，我们可以使用
 if（$ data instanceof \Portal\PriceWatchBundle\ Entity\PriceWatch）{
 $ country =（$ data-> getVerifiedCountry（））？ $ data-> getVerifiedCountry（）：null; 
} 
 else {
 $ country = $ data ['verified_country']; 
} 
 
 //在这里你可以以某种方式填充选项u在loadChoices中使用你的服务
 $ choices = array（''，''，'Manchester '=>'曼彻斯特'，'利兹'=>'利兹'）; 
 
 #if（/ *某些条件等* /）
＃{
＃$ options = array（'3'=>'3'，'4'=> ;'4'）; 
＃} 
 $ form-> add（$ ff-> createNamed（'verified_city'，'choice'，null，compact（'choices'）））; 
}; 
 
 //在PreSet和PreBind上注册上面的EventListener函数
 
 //在第一次初始化时调用这个函数 - 在这个例子中不需要
＃$ builder - > addEventListener（FormEvents :: PRE_SET_DATA，$ func）; 
 
 //在验证之前调用
 $ builder-> addEventListener（FormEvents :: PRE_BIND，$ func）; 
 
} 
  

I have a drop down form element. Initially it starts out empty but it is populated with values via javascript after the user has made some interactions. Thats all working ok. However when I submit it always returns a validation error This value is not valid..

If I add the items to the choices list in the form code it will validate OK however I am trying to populate it dynamically and pre adding the items to the choices list is not going to work.

The problem I think is because the form is validating against an empty list of items. I don't want it to validate against a list at all. I have set validation required to false. I switched the chocie type to text and that always passes validation.

This will only validate against empty rows or items added to choice list

$builder->add('verified_city', 'choice', array(
  'required' =>  false
));

Similar question here that was not answered.
Validating dynamically loaded choices in Symfony 2

Say you don't know what all the available choices are. It could be loaded in from a external web source?

解决方案

after much time messing around trying to find it. You basically need to add a PRE_BIND listener. You add some extra choices just before you bind the values ready for validation.

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\FormEvent;


public function buildForm(FormBuilderInterface $builder, array $options)
{

  // .. create form code at the top

    $ff = $builder->getFormFactory();

    // function to add 'template' choice field dynamically
    $func = function (FormEvent $e) use ($ff) {
      $data = $e->getData();
      $form = $e->getForm();
      if ($form->has('verified_city')) {
        $form->remove('verified_city');
      }


      // this helps determine what the list of available cities are that we can use
      if ($data instanceof  \Portal\PriceWatchBundle\Entity\PriceWatch) {
        $country = ($data->getVerifiedCountry()) ? $data->getVerifiedCountry() : null;
      }
      else{
        $country = $data['verified_country'];
      }

      // here u can populate choices in a manner u do it in loadChoices use your service in here
      $choices = array('', '','Manchester' => 'Manchester', 'Leeds' => 'Leeds');

      #if (/* some conditions etc */)
      #{
      #  $choices = array('3' => '3', '4' => '4');
      #}
      $form->add($ff->createNamed('verified_city', 'choice', null, compact('choices')));
    };

    // Register the function above as EventListener on PreSet and PreBind

    // This is called when form first init - not needed in this example
    #$builder->addEventListener(FormEvents::PRE_SET_DATA, $func); 

    // called just before validation 
    $builder->addEventListener(FormEvents::PRE_BIND, $func);  

}

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