How can I add an error message to a form? - php

Question

I am validating a user login and would like to attach an error message to the form if they the user submits details that do not authenticate.
In FieldSet I can see function setMessages() but this only appears to match and set against an element key.
How can I attach an error message to the form and not to a form element?
The following code is in within the LoginForm class.
public function isValid()
{
$isValid = parent::isValid();
if ($isValid)
{
if ($this->getMapper())
{
$formData = $this->getData();
$isValid = $this->getMapper()->ValidateUandP($formData['userName'], $formData['password']);
}
else
{
// The following is invalid code but demonstrates my intentions
$this->addErrorMessage("Incorrect username and password combination");
}
}
return $isValid;
}

Answer 1

The first example is validating from a database and simply sending back an error message to the form:
//Add this on the action where the form is processed
if (!$result->isValid()) {
$this->renderLoginForm($form, 'Invalid Credentials');
return;
}
This next one is adding simple validation to the form itself:
//If no password is entered then the form will display a warning (there is probably a way of changing what the warning says too, should be easy to find on google :)
$this->addElement('password', 'password', array(
'label' => 'Password: ',
'required' => true,
));
I hope this is of use.

Answer 2

In ZF1: in order to attach an error message to a form - you can create a decorator element for this:
Taken from:
http://mwop.net/blog/165-Login-and-Authentication-with-Zend-Framework.html
class LoginForm extends Zend_Form
{
public function init()
{
// Other Elements ...
// We want to display a 'failed authentication' message if necessary;
// we'll do that with the form 'description', so we need to add that
// decorator.
$this->setDecorators(array(
'FormElements',
array('HtmlTag', array('tag' => 'dl', 'class' => 'zend_form')),
array('Description', array('placement' => 'prepend')),
'Form'
));
}
}
And then as an example in your controller:
// Get our authentication adapter and check credentials
$adapter = $this->getAuthAdapter($form->getValues());
$auth = Zend_Auth::getInstance();
$result = $auth->authenticate($adapter);
if (!$result->isValid()) {
// Invalid credentials
$form->setDescription('Invalid credentials provided');
$this->view->form = $form;
return $this->render('index'); // re-render the login form
}
Unsure if this still works in ZF2