Detect ajax and render other view in zend

$request = $this->getRequest();
if ($request->isXmlHttpRequest()){
                  $this->_helper->layout()->disableLayout();
                    $this->_helper->viewRenderer('evencalendarajax');
                    //this->_helper->getHelper('viewRenderer')->setNoRender();
                }

1. get all request
 2. check request is ajax request.
3.Disable layout
4. Call another view if you want.
5. Disable view if you don't use view.