Saturday, September 21, 2013

How to Pass the ServiceManager to Forms and Taking Advantage of the init()

Seems pretty easy and its also documented in the ZF2 docs but I think its worth repeating here.

In short, when creating forms by extending the Form object it is a good practice to create your elements inside the init() method.

namespace class\name\space;
class MyForm extends Form implements ServiceLocatorAwareInterface
    protected $serviceLocator;

    public function __construct()

    public function init()
            'type' => 'MyCustomFieldset', // You are not using a class name space,
            'name' => 'custom_fieldset',

            'type' => 'Select',
            'name' => 'custom_select',
            'options' => array(
                'value_options' => $this->getSelections(), // you can access methods via the ServiceManager now!

    public function getSelections()
         $mainServiceManager = $this->getServiceLocator()->getServiceLocator();
         return $mainServiceManager->get('someService')

    public function getServiceLocator()
        return $this->serviceLocator;

    public function setServiceLocator(ServiceLocator $serviceLocator)
        $this->serviceLocator = $serviceLocator;
As you see from above, you have access now to the ServiceManager. You can even use $this->getSelections(). You will not be able to do that inside the __construct()!

Of course, you have to set this up inside Module.php via the Form Element Manager

public function getFormElementConfig()
    return array(
        'invokables' => array(
            'MyForm' => 'class\name\space\MyForm',
            'MyCustomFieldset' => 'class\name\space\MyFieldset',
To access the form, simply pull it from the Form Element Manager
// some controller
public function indexAction()
    $form = $this->getServiceLocator()->get('FormElementManager')->get('MyForm');
    return ViewModel(array(
        'form' => $form,


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