ZF2 input validator for required not empty only when not null

Question

I'm building a form with input filters and all in Zend Framework 2. I'm using arrays to configure my inputs and filters and validators. So, say I have some input:

array(
    'name' => 'foo',
    'required' => true,
)

On the page, there's some jQuery code that might optionally hide this input. If it does, it hides and disables the input. On submit, var_dump on the form data gives foo => null (probably because it didn't actually submit in the post data and so the form input is never given a value). If the input is not hidden and not filled out then on submit it has foo => string '' (length=0).

I want to require the input to have a value if the input is used. So, are there some settings I can add to my config array that will allow null to pass validation, but reject the empty string value? Or do I need to write a custom validator?

akond · Accepted Answer · 2015-07-18 20:22:02Z

3

Yes, you ought to use NotEmpty validator.

$inputFilter = new \Zend\InputFilter\InputFilter ();
$inputFilter->add ([
  'name' => 'foo',
  'validators' => [
    [
      'name' => 'not_empty',
      'options' => [
        'type' => 'string'
      ]
    ]
  ]
]);

$form->setInputFilter ($inputFilter);

answered Jul 18, 2015 at 20:22

akond

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Daniel Skarbek Over a year ago

For the sake of other readers, the key here is that if you don't specify your own not_empty validator, a default one is created that is more limiting. I eventually got my use-case to work. A couple other keys points here was that I needed to still specify the required attribute (otherwise it seems to assume that it is required?). Also, I had a StringLength validator on there as well, and that had a problem when the input was null, so I had to drop that. Haven't investigated whether I can make StringLength ok with a null value yet.

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