php - How to prevent "confirm form resubmission" popup after failed form submission

Solution:

Error bubbling true is what groups all of the errors together. Set this false.

The error popup is based on your browser. I'm not sure that can be shut off via Symfony. The

    required => false 
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should have done this already.

Solution:

Trick is to keep form data in a session and populate form type with the data stored in same session for failing forms submissions. Data stays in session until successful form submission.

Full example is here: Preventing 'Confirm form resubmission' dialog in symfony applications

/**
 * @Route("/interest", service="my_test_bundle.controller.interest")
 */
class InterestController
{
    private $formFactory;
    private $router;

    public function __construct(
        FormFactoryInterface $formFactory,
        RouterInterface $router
    ) {
        $this->formFactory = $formFactory;
        $this->router = $router;
    }

    /**
     * @Method({"GET"})
     * @Route("", name="interest_index")
     * @Template()
     *
     * @param Request $request
     *
     * @return array
     */
    public function indexAction(Request $request)
    {
        $form = $this->createForm();

        $session = $request->getSession();
        if ($session->has($this->getFormName())) {
            $request->request->set(
                $this->getFormName(),
                unserialize($session->get($this->getFormName()))
            );
            $request->setMethod('POST');
            $form->handleRequest($request);
        }

        return ['interest_form' => $form->createView()];
    }

    /**
     * @Method({"POST"})
     * @Route("", name="interest_create")
     *
     * @param Request $request
     *
     * @return RedirectResponse
     */
    public function createAction(Request $request)
    {
        $session = $request->getSession();

        $form = $this->createForm();
        $form->handleRequest($request);
        if ($form->isValid()) {
            // Do something with: $form->getData();

            $session->remove($this->getFormName());
            $routeName = 'home_or_success_route';
        } else {
            $session->set(
                $this->getFormName(),
                serialize($request->request->get($this->getFormName()))
            );

            $routeName = 'interest_index';
        }

        return new RedirectResponse($this->router->generate($routeName));
    }

    private function createForm()
    {
        return $this->formFactory->create(
            InterestType::class,
            new Interest(),
            [
                'method' => 'POST',
                'action' => $this->router->generate('interest_create'),
                'attr' => ['id' => $this->getFormName()],
            ]
        );
    }

    private function getFormName()
    {
        return InterestType::NAME;
    }
}
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