ZendFramework – How to add ->HeadScript() from Controllers?

I have a case where i need to add the Javascript from controller to the Layout where it has already HeadScript();

How to do that from controller?

e.g: $this->view->HeadScript()->appendScript();

This is controller: Both does not apply.

class RouterController extends Zend_Controller_Action
{
  public function init()
  {
    $this->view->HeadScript()->appendFile('/js/test.js')->setIndent(8);
    $this->view->HeadScript( Zend_View_Helper_HeadScript::FILE, '/js/test.js' );
  }
}

This is the view file: index.phtml

<?//$this->HeadScript()->appendFile('/js/test.js')->setIndent(8);?>

If i uncomment in view it works but not in Controller. I want to apply this from controller how now?

Answer

I got this to work from the preDispatch method in a controller, remember you have to pass layout changes before headers are passed.

public function preDispatch() {
        parent::preDispatch();
        $layout = new Zend_Layout();

        $layout->getView()->headScript()->appendScript('/javascript/form.js', 'text/javascript');
    }

you still have to have the headScript placeholder in your layout.