Choice field default value

问题:

I have the following form:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
    ->add('type', ChoiceType::class, array(
        'expanded' => true,
        'multiple' => false,

        'choices' => array(
            'Friend' => 'friend',
            'Guide' => 'guide'
        )
    ));
}

How can I make 'Friend' checkbox to be checked by default when the form is rendered ?

回答1:

I think you should try with data option, but it's just in the case where you don't even have a data saved inside your object, because it will override it else.

Important : It's good for create action, but not for edit action.

 public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
        ->add('type', ChoiceType::class, array(
            'expanded' => true,
            'multiple' => false,

            'choices' => array(
                'Friend' => 'friend',
                'Guide' => 'guide'
            ),
            'data' => 'friend'
        ));
    }

Official link

Extract :

When you create a form, each field initially displays the value of the corresponding property of the form's domain object (if an object is bound to the form). If you want to override the initial value for the form or just an individual field, you can set it in the data option

UPDATE If YOU NEED EMPTY VALUE:

As the answer below, replace data with empty_data if you need in any case to update default value

回答2:

Use the empty_data form field option. (not data because it will override any posted data unless you set it dynamically).

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
    ->add('type', ChoiceType::class, array(
        'expanded' => true,
        'multiple' => false,

        'choices' => array(
            'Friend' => 'friend',
            'Guide' => 'guide'
        ),
        'empty_data' => 'friend'
    ));
}

Another option for complex cases is to use Sf Dynamic Form Events.

回答3:

I think it would be better to set initial values in the Entity constructor:

public function __construct()
{
    $this->exercises = new ArrayCollection();

    $this->setTitle("WOCHE#") ;

    $this->setYear(date('Y'));

    $this->setWeekInCalendar(Week::getCurrentWeekInCalendar());
}

回答4:

If you don't want to override value for an edition you can do this :

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
        $form = $event->getForm();

        $form->add(
            'type', 
            ChoiceType::class,
            [
                'expanded' => true,
                'multiple' => false,
                'choices' => [
                    'Friend' => 'friend',
                    'Guide' => 'guide'
                ],
                'data' => $event->getData() ?: 'friend'
            ]);
    });
}