Zend - Dynamic form dropdown - zend-framework

Question

I start with zend framework and I'm having trouble implementing a dynamic drop-down list.
I need to create a simple dropdown list of events select from the database.
This is my Module class :
public function getFormElementConfig()
{
return array(
"factories" => [
'participant_form' => function (ServiceManager $serviceManager) {
/** #var EntityManager $entityManager */
$entityManager = $serviceManager->get("doctrine.entitymanager.orm_default");
$events = $entityManager->getRepository('Application\Entity\Event')->findAll();
$eventForSelect = array();
foreach ($events as $event) {
$eventForSelect[$event->getId()] = $event->getName();
}
/** #var \Zend\Form\Form $form */
$form = new ParticipantForm();
$form->setHydrator(new DoctrineHydrator($entityManager));
$form->setObject(new Participant());
$form->setOption('event_for_select', $eventForSelect);
return $form;
},
]
);
}
but I do not know how to get the option 'event_for_select' in my form :
class ParticipantForm extends Form
{
public function __construct($name = null)
{
parent::__construct('user');
$this->setAttribute('class', 'form-horizontal');
$this->add([
'name' => 'id',
'type' => 'Hidden',
]);
$this->add([
'name' => 'firstname',
'type' => 'Text',
'options' => [
'label' => 'Prénom',
],
]);
$this->add([
'name' => 'event',
'type' => 'Select',
'options' => [
'label' => 'Event',
'value_options' => // ?? $event_for_select
],
]);
Thanks for your help !

Answer 1

Add field in your form class:
class ParticipantForm extends Form
{
protected $eventForSelect;
public function setEventForSelect($eventForSelect)
{
$this->eventForSelect = $eventForSelect;
// update field value options
$this->get('event')
->setValueOptions($this->eventForSelect);
return $this;
}
// rest of form class code
}
Then use setEventForSelect() method in your factory:
/** #var \Zend\Form\Form $form */
$form = new ParticipantForm();
$form->setHydrator(new DoctrineHydrator($entityManager));
$form->setObject(new Participant());
$form->setEventForSelect($eventForSelect);
return $form;
And then in form:
$this->add([
'name' => 'event',
'type' => 'Select',
'options' => [
'label' => 'Event',
'value_options' => $this->eventForSelect,
],
]);