if isn't multiple ,You can achieve that by defining tow options placeholder and empty_data
class YourType extends AbstractType {
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('managers', SubclassEntityType::class, [
'placeholder' => 'Please choose a manager..',
'empty_data' => null,
'class' => 'User',
'choice_label' => 'Managers',
'required' => false,
'query_builder' => function (UserRepository $er) {
return $er->getManagersQueryBuilder();
},
]);
$builder->add('types', SubclassEntityType::class, [
'placeholder' => 'Please choose a type..',
'empty_data' => null,
'class' => 'User',
'class' => 'Type',
'choice_label' => 'Types',
'required' => false,
'query_builder' => function (UserRepository $er) {
return $er->getManagersQueryBuilder();
},
]);
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
// ...
]);
}
}
For multiple choices we can use finishView method for creating new choices and add them on children of your type.
<?php
namespace App\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\ChoiceList\View\ChoiceView;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\OptionsResolver\OptionsResolver;
class YourType extends AbstractType
{
// If you have in the future other type Entity Type and you want to add option empty
// You can just add it on this list
private const OPTION_EMPTY_ENTITIES_TYPE = [
// child name => 'Message on option empty',
'managers' => 'Select a manager..',
'types' => 'Select a type..',
];
private const OPTION_EMPTY_KEY ='option-empty';
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('managers', SubclassEntityType::class, [
'class' => 'User',
'choice_label' => 'Managers',
'required' => false,
'query_builder' => function (UserRepository $er) {
return $er->getManagersQueryBuilder();
},
'multiple' => true,
]);
$builder->add('types', SubclassEntityType::class, [
'class' => 'Type',
'choice_label' => 'Types',
'required' => false,
'query_builder' => function (UserRepository $er) {
return $er->getManagersQueryBuilder();
},
'multiple' => true,
]);
$builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
$data = $event->getData();
// remove all options we has add on finishView
foreach (self::OPTION_EMPTY_ENTITIES_TYPE as $childName => $optionMessage) {
if (false !== ($key = array_search(self::OPTION_EMPTY_KEY ,$data[$childName]))) {
unset($data[$childName][$key]); // example $data['managers'][0] => option-empty
}
}
$event->setData($data);
});
}
public function finishView(FormView $view, FormInterface $form, array $options)
{
foreach (self::OPTION_EMPTY_ENTITIES_TYPE as $childName => $optionMessage) {
// value option-empty is not a valid option of EntityType X ,otherwise if user select this option
// this form is invalid...
$newChoice = new ChoiceView(null, self::OPTION_EMPTY_KEY, $optionMessage);
array_unshift($view->children[$childName]->vars['choices'], $newChoice);
}
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
// ..
]);
}
}
