Question

我是Symfony2的新手。我创建了一个包含3组单选按钮和一个提交按钮的表单。为了显示表单，我使用了FormType。现在，我必须应用一个条件，即用户只能选择最多2组单选按钮（最少0组单选按钮）而不能选择3组单选按钮。如果用户选择3组单选按钮并单击提交，那么我想向用户抛出一条错误消息，说“你只能选择2”。

这是FormType“SubscriptionsType.php”

 <?php

 namespace InstituteEvents\StudentBundle\Form\Type;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\FormBuilderInterface;


class SubscriptionsType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
 $builder

->add('event1', 'choice', array('choices' => array('1' => 'Tourism', '2' => 'Food party',     '3'     => 'South korean food', '4' => 'Cooking', '5' => 'None of the above'), 'data' => '5', 'expanded' => true, 'multiple' => false))

->add('event2', 'choice', array('choices' => array('6' => 'Cricket', '7' => 'Football', '8' => 'Hockey', '9' => 'Baseball', '10' => 'Polo', '5' => 'None of the above'), 'data' => '5', 'expanded' => true, 'multiple' => false))

->add('event3', 'choice', array('choices' => array('11' => 'Game 1', '12' => 'Game 2', '13' => 'Game 3', '14' => 'Game 4', '15' => 'Game 5', '5' => 'None of the above'), 'data' => '5', 'expanded' => true, 'multiple' => false))

->add('register', 'submit');
}

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

这是控制器“DefaultController”

 <?php

 namespace InstituteProjectEvents\StudentBundle\Controller;

 use Symfony\Bundle\FrameworkBundle\Controller\Controller;
 use InstituteProjectEvents\StudentBundle\Entity\Subscriptions;
 use InstituteProjectEvents\StudentBundle\Form\Type\SubscriptionsType;
 use Symfony\Component\HttpFoundation\Request;

 class DefaultController extends Controller {

public function eventsoneAction(Request $request) {

 $subscriptions = new Subscriptions();

//Get the logged in users id
$user = $this->get('security.context')->getToken()->getUser();
$userId = $user->getId();

//Check if events already selected by user
$repository = $this->getDoctrine()->getManager()
        ->getRepository('InstituteProjectEventsStudentBundle:Subscriptions');

$query = $repository->findOneBy(array('id' => $userId));

if(($query == NULL)) {

   $subscriptions->setEvent1(5); 
   $subscriptions->setEvent2(5);
   $subscriptions->setEvent3(5);

   $subscriptions->setStudents($userId);

   $form = $this->createForm(new SubscriptionsType(), $subscriptions);
   $form->handleRequest($request);

   }

  else {

       $subscriptions->setEvent1($query->getEvent1());
       $subscriptions->setEvent2($query->getEvent2());
       $subscriptions->setEvent3($query->getEvent3());

       $subscriptions->setStudents($userId);
       $form = $this->createForm(new SubscriptionsType(), $subscriptions);
       $form->handleRequest($request);
  }

if ($form->isValid()) {
//Save to the Database    

$em = $this->getDoctrine()->getManager();
$em->persist($subscriptions);
$em->flush();

  return $this->redirect($this->generateUrl('InstituteProject_events_student_eventsregistered'));
}

 if($current_date > date_format($date,"Y/m/d h:i:s a")) {
   return $this->render('InstituteProjectEventsStudentBundle:Default:registrationsclosed.html.twig');
   }
 else {
      $form = $this->createForm(new SubscriptionsType(), $subscriptions);

      return $this->render('InstituteProjectEventsStudentBundle:Default:eventsday1.html.twig', array('form' => $form ->createView()));
 }
 }

/**
 * This action displays the Confirmation page on success.
 */
public function eventsregisteredAction() {
return $this->render('InstituteProjectEventsStudentBundle:Default:eventsregistered.html.twig');
}
}

需要在“DefaultController.php”中编写什么验证才能应用最多只选择2组单选按钮且最少为0的规则？

Answer 1

如何将Callback约束应用于整个表单字段？

...

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver
        ->setDefaults(array(
            ...
            'constraints' => array(
                new Callback(
                    array('callback' => array($this, 'validateForm'))
                )
            )
        ));
}

public function validateForm($data, ExecutionContextInterface $context)
{
    if (CONDITION) {
        // build and add violation
    }
}

或者，您可以查看Request对象..

Answer 2

为了做你想做的事，你需要设置

'required' => false

到event1，event2和event3，因为默认情况下必需设置为true。然后，您需要为表单提交添加javascript（或jquery）侦听器，并且如果选择了所有三个字段，则插入错误消息。但是，您会遇到无法取消选择单选按钮的问题，因为一旦您选择单选按钮就无法取消选择，所以一旦您为所有这三个选择了某些内容，您就会遇到这样的问题。在没有刷新页面的情况下永远无法提交表单。因此，如果采用这种方式，您可能希望进行一些工作流程更改。

或者，您只需在控制器中进行手动检查，然后通过

手动添加错误

$form->get('event3')->addError('you can only select 2');

但是你需要清除＆＃39;您的订阅，否则它将重新呈现已填充先前选择的表单，您将进入无限循环。

Answer 3

我通过替换上面的＆＃34; DefaultController.php＆＃34;中的以下代码得到了答案。： -

 if ($form->isValid()) {
    //Get the submitted form's data   
    $subscriptions2 = $form->getData();

    //To check if the user has selected more than 2 events or not

    if(($subscriptions2->getEvent1() != 5) && ($subscriptions2->getEvent2() != 5) && ($subscriptions2->getEvent3() != 5))  {
        echo 'You can select only a maximum of 2 events';
        echo '<br>';
        return $this->render('InstituteProjectEventsStudentBundle:Default:eventsday1.html.twig', array('form' => $form ->createView()));
    }

在这里，需要注意的是，我已经给出了以上所有＆＃34;以及＃34;单选按钮为＆＃34; SubscriptionsType.php＆＃34;和5作为所有＆＃34;以上所有＆＃34;的事件ID在＆＃34;事件＆＃34;的表格中在数据库中。

在Symfony2表单中提交后，限制用户检查的单选按钮数量

3 个答案: