Symfony3 get the value of a non mapped field in event listener - addeventlistener

Question

Trying to make a form that a user chooses an option and depending on their choice loads additional fields. So far I have a UserSignupType:
class UserSignupType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('userType', ChoiceType::class, array(
'choices' => array(
"Subscriber" => "Subscriber",
"Friend" => "Friend"
),
'expanded' => true,
'mapped' => false
));
$builder->addEventListener(
FormEvents::PRE_SET_DATA,
function (FormEvent $event) {
$form = $event->getForm();
$usertype = $form->get('userType')->getData(); //updated per JBaffords answer
if($userType == "Subscriber")
{
$builder->add('agency', EntityType::class, array(
"class" => "\AppBundle\Entity\Agency",
"label" => "name"));
}
elseif($userType == "Friend")
{
$builder->add('phoneNumber', PhoneNumberType::class, array(
'default_region' => 'US',
'format' => PhoneNumberFormat::NATIONAL));
}
}
);
}
// ...
}
not sure if the getData method is the right method to use, and if it is, i need to somehow get the "userType" field out of it. I cant call getUserType because its not an actual mapped property and I don't want it to be. It simply decides the fields to show.

Answer 1

You can get the value for any form element (mapped or unmapped) by doing:
$form->get('fieldName')->getData();
get() returns a Form object, so if you have a nested form, you can continue to call ->get('nextFieldName') on each child until you get to the form element you need.
The value returned from getData for a form is going to depend on (amont other things) the mapping of its child elements. If the form has no children, then its value is its value; the mapping just determines whether that value is populated into its parent's data.
In your specific case, to get the data for the userType element, you would do:
$userType = $form->get('userType')->getData();