ZF2 remove isEmpty validation for form element - php

Question

I need use form element with out isEmpty validation. This is my code.
$this->add(array(
'name' => 'test',
'type' => 'Zend\Form\Element\Number',
'attributes' => array(
'class' => 'form-control',
)
));
But following validation message is given.
[test] => Array
(
[isEmpty] => Value is required and can't be empty
)
How can i remove it?

Answer 1

Look here:
https://github.com/zendframework/zf2/blob/master/library/Zend/Form/Element/Number.php#L95
You can extend this class and overload getInputSpecification function and return array without 'required' => true
Like this:
namespace Your\Form\Elements;
use Zend\Form\Element\Number;
class NumberWithoutRequired extends Number{
public function getInputSpecification()
{
return array(
'name' => $this->getName(),
'required' => false,
'filters' => array(
array('name' => 'Zend\Filter\StringTrim')
),
'validators' => $this->getValidators(),
);
}
}
And then use this class for input in Your form instead of original Zend\Form\Element\Number class

Answer 2

If you have a specific form class, add a getInputFilterSpecification method with your validation rules:
class MyForm extends \Zend\Form\Form
{
public function init() // or __construct() if not using element manager
{
$this->add(array(
'name' => 'test',
'type' => 'Zend\Form\Element\Number',
'attributes' => array(
'class' => 'form-control',
)
));
}
public function getInputFilterSpecification()
{
return [
'test' => [
'required' => false,
]
];
}
}

Answer 3

You could do that by creating new ValidatorChain, and then loop through the validators attached to your element and dettach the Zend\Validator\NotEmpty validator. Just like this :
$newValidatorChain = new \Zend\Validator\ValidatorChain;
foreach ($form->getInputFilter()->get('test')->getValidatorChain()->getValidators()
as $validator)
{
//Attach all validators except the \Zend\Validator\NotEmpty one
if (!($validator['instance'] instanceof \Zend\Validator\NotEmpty)) {
$newValidatorChain->addValidator($validator['instance'],
$validator['breakChainOnFailure']);
}
}
$form->getInputFilter()->get('test')->setValidatorChain($newValidatorChain);