Zend Framework: Add form in layout - zend-framework

Question

I create login form andd add in UserController->loginAction:
public function loginAction() {
$form = new Application_Form_Login();
$this->view->loginForm = $form;
}
How to add my form in layouts/scripts/header.phtml, because I try this, but not work:
<?php echo $this->loginForm ?>
If I echo form in views/scripts/user/login.phtml I see login form.
That is my login form:
class Application_Form_Login extends Zend_Form {
public function init() {
$this->setDecorators(array('FormElements', 'Form'))
->setAction("/user/login/");
$username = new Zend_Form_Element_Text(array('name' => 'username', 'class' => 'input-text'));
$username->setRequired(true)
->setDecorators(array('ViewHelper',));
$this->addElements(array($username));
}
}

Answer 1

You are looking for the render function:
<?php
echo $this->loginForm->render();
?>

Answer 2

Since a layout is separate from your view object, you need to assign the form to the layout.
In your controller:
public function loginAction()
{
$form = new Application_Form_Login();
// assign the form to the layout
$this->_helper->layout()->loginForm = $form;
}
In your layout:
<?php if ($this->layout()->loginForm): ?>
<?php echo $this->layout()->loginForm; ?>
<?php endif; ?>
Try this instead:
// in controller:
$form = new Application_Form_Login();
$this->view->placeholder('loginForm')->set($form);
---------------
// in layout script:
$form = $this->placeholder('loginForm');
if ($form instanceof Zend_Form) {
echo $form;
}