Using Zend Framework and setting a Zend_Form_Element form field to be required, how do I change the validator used to ensure that the element is not blank

Question

Hi,

When using a Zend_Form, the only way to validate that a input is not left blank is to do

$element->setRequired(true);

If this is not set and the element is blank, it appears to me that validation is not run on the element.

If I do use setRequired(), the element is automatically given the standard NotEmpty validator. The thing is that the error message with this validator sucks, "Value is empty, but a non-empty value is required". I want to change this message. At the moment I have done this by changing the Zend_Validate_NotEmpty class, but this is a bit hacky.

I would ideally like to be able to use my own class (derived from Zend_Validate_NotEmpty) to perform the not empty check.

Answer 1

Change the error message.

Answer 2

As far as I can see Changing the error message has no way of changing the message of a specific error. Plus the manual makes it look like like this is a function belonging to Zend_Form, but I get method not found when using it on an instance of Zend_Form.

And example of the useage would be really great.

Answer 3

I did it this way (ZF 1.5):

$name = new Zend_Form_Element_Text('name');
$name->setLabel('Full Name: ')
     ->setRequired(true)
     ->addFilter('StripTags')
     ->addFilter('StringTrim')
     ->addValidator($MyNotEmpty);

so, the addValidator() is the interesting part. The Message is set in an "Errormessage File" (to bundle all custom messages in one file):

$MyNotEmpty = new Zend_Validate_NotEmpty();
$MyNotEmpty->setMessage($trans->translate('err.IS_EMPTY'),Zend_Validate_NotEmpty::IS_EMPTY);

hope this helps...

Answer 4

By default, setRequired(true) tells isValid() to add a NonEmpty validation if one doesn't already exist. Since this validation doesn't exist until isValid() is called, you can't set the message.

The easiest solution is to simply manually add a NonEmpty validation before isValid() is called and set it's message accordingly.

$username = new Zend_Form_Element_Text('username');
$username->setRequired(true)
         ->addValidator('NotEmpty', true, array('messages' => array('isEmpty' => 'Empty!')));

Answer 5

Add a NotEmpty validator, and add your own message:

// In the form class:
$username = $this->createElement('text', 'username');
$username->setRequired();  // Note that this seems to be required!
$username->addValidator('NotEmpty', true, array(
    'messages' => array(
        'isEmpty' => 'my localized err msg')));

Note that the NotEmpty validator doesn't seem to be triggered unless you've also called setRequired() on the element.

In the controller (or wherever), call $form->setTranslator($yourTranslator) to localize the error message when it's printed to the page.