[fw-general] How to validate Zend_Dojo_Form_Element_Textarea?

[Ian R]

Hi there!  I'm trying to make a textarea, dojo-enabled, with a maximum  
of 500 characters.  Here's what I have:

// creating validator
$validator = new Zend_Validate_StringLength();
$validator->setMin(2)
    ->setMax(5)
    ->setMessage('Text is too  
long!',Zend_Validate_StringLength::TOO_LONG);

// create textarea and add validator
$el = new Zend_Dojo_Form_Element_Textarea("ef_Description");
$el->setLabel("Describe the Event")
    ->addValidator($validator);

$this->addElement($el);

Everything else validates, dojo-style, but every other form element is  
derives from ValidationTextBox.  Some debugging shows that the isValid  
function, defined in Zend/Validate/StringLength.php, is never being  
called.

How do I call it?  Is it just a matter of adding onkeydown and onblur  
events?

Thanks again for everyone's help.  I promise I use the list as a last  
resort, and I'm stumped!

Ian