/**
* Skip loading helpers if this is a _serialize based view.
*
* @return void
*/
public function loadHelpers()
{
if (isset($this->viewVars['_serialize'])) {
return;
}
parent::loadHelpers();
}
/**
* Render a JSON view.
*
* ### Special parameters
* `_serialize` To convert a set of view variables into a JSON response.
* Its value can be a string for single variable name or array for multiple
* names. If true all view variables will be serialized. It unset normal
* view template will be rendered.
* `_jsonp` Enables JSONP support and wraps response in callback function
* provided in query string.
* - Setting it to true enables the default query string parameter "callback".
* - Setting it to a string value, uses the provided query string parameter
* for finding the JSONP callback name.
*
* @param string|null $view The view being rendered.
* @param string|null $layout The layout being rendered.
* @return string|null The rendered view.
*/
public function render($view = null, $layout = null)
{
$return = parent::render($view, $layout);
if (!empty($this->viewVars['_jsonp'])) {
$jsonpParam = $this->viewVars['_jsonp'];
if ($this->viewVars['_jsonp'] === true) {
$jsonpParam = 'callback';
}
if (isset($this->request->query[$jsonpParam])) {
$return = sprintf('%s(%s)', h($this->request->query[$jsonpParam]), $return);
$this->response->type('js');
}
}
return $return;
}