Symfony2 form: enable/disable field from listener

Question

I need to disable / re-enable form fields depending on values of a given field. To achieve it, I use a listener on the onPreSubmit event. Then, if a field should be disabled, it is added to the form again like

$form->add('name', 'text', array("disabled" => "disabled");

This work great in one sense: if a field was enabled but should be disabled, then the result is OK. In the other sense, if a field was disabled then this field is not sent. In the listener, the field is enable but on the final result the intial value isn't there anymore.

I assume that, because the field was disabled, it wasn't sent, so Symfony considered it has a null value. From a listener on preSubmit or Submit events, if I do:

$event->getData()

Then all fields that are in the form but not in the POST data are set to null. Is there no way to activate simply the field, keeping the initial value ? Or to not consider the value of missing fields ?

Marino Di Clemente · Accepted Answer · 2016-01-15 15:20:25Z

Better later than never:)

Today i had the same problem, in conclusion you can't change options of a field using a listener because options property is private and there are only getOption and getOptions, but you can remove and add a clone of the field

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $this->buildUserForm($builder, $options);

    $builder->addEventListener(
        FormEvents::PRE_SET_DATA,
        function (FormEvent $event) {
            $form = $event->getForm();
            $user = $event->getData();
            if($user->getBirthday()){ 
                $this->disableField($form->get('birthday'));
            }
        }
    );
}

private function disableField($field){
    $parent = $field->getParent();
    $options = $field->getConfig()->getOptions();
    $name = $field->getName();
    $type = $field->getConfig()->getType()->getName();
    $parent->remove($name);
    $parent->add($name, $type, array_merge($options,['disabled' => true]));
}

holzi · Accepted Answer · 2017-08-23 11:59:11Z

5

In addition to Marino Di Celemente's answer, this is a slightly adjusted disableField method for Symfony 3.2

use Symfony\Component\Form\FormInterface;
private function disableField(FormInterface $field)
{
    $parent  = $field->getParent();
    $options = $field->getConfig()->getOptions();
    $name    = $field->getName();
    $type    = get_class($field->getConfig()->getType()->getInnerType());
    $parent->remove($name);
    $parent->add($name, $type, array_merge($options, ['disabled' => true]));
}

edited Aug 23, 2017 at 11:59

holzi

627 bronze badges

answered Feb 8, 2017 at 20:40

con

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Comments

Gillu13 · Accepted Answer · 2020-05-19 15:17:21Z

0

Your problem looks similar to the example from Symfony's documentation on dynamic form modification. In your case, the "given field" on which values depends the disabling / re-enabling of the "name" field is equivalent to the "sport" field of Symfony's documentation, and your "name" field (more specifically the "disabled" option) is equivalent to the "position" field (more specifically the "choices" option) of Symfony's documentation.

Above, I gave the link to Symfony 2.8's documentation since it's the version you mentioned in your question, but it's not maintained anymore. If you want up-to-date information, refer to more recent doc.

edited May 19, 2020 at 15:17

answered May 19, 2020 at 9:48

Gillu13

9586 silver badges12 bronze badges

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