Ajax Call Exceptions Display Web Page Content in Javascript Console

dqj

My Nette app is an API for use by Angular, so all uses on the server side of my app are AJAX service calls. Unfortunately, if there is an error, a web page is sent to the ajax calling routine.

Is there a way to override the default handling and present the exception as json data in the output?

greeny

I think it shall be enough to modify your ErrorPresenter (which works the same way as normal presenters, except it is called only on error).

	public function run(Nette\Application\Request $request)
	{
		$exception = $request->getParameter('exception');
		if ($exception instanceof Nette\Application\BadRequestException) {
			return new Responses\ForwardResponse($request->setPresenterName('Error4xx'));
		}
		$this->logger->log($exception, ILogger::EXCEPTION);

		// this part is added
		if ($this->isAjax()) {
			$this->sendJson([
				"error" => $exception->getMessage(),
				"code" => $exception->getCode(),
				"type" => $exception::class,
			]);
		}
		// end of added part

		return new Responses\CallbackResponse(function () {
			require __DIR__ . '/templates/Error/500.phtml';
		});
	}

(based on Nette/Web-Project's Error presenter)

dqj

Thank you. I haven't been able to get the ErrorPresenter class to engage, somehow. It seems to work if I do not set enableDebugger(), but then it raises a whole new set of problems too difficult to untangle. It is going to be too much to take on until I understand Nette better.

Last edited by dqj (2015-10-18 18:41)

David Matějka

In the debug mode, Nette does not use ErrorPresenter by default, but you can enable it to test its funcionality.

config.neon:

application:
	catchExceptions: true