symfony form submit on refresh

To prevent form submission on refresh in Symfony, you can make use of the Post/Redirect/Get (PRG) pattern. This pattern involves redirecting the user to a different page after they submit the form, thereby preventing the form from being resubmitted when the user refreshes the page.

Here's how you can implement the PRG pattern in Symfony:

1. Create a controller action to handle the form submission:

use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;

public function submitFormAction(Request $request)
{
    // Process the form submission here

    // Redirect the user to a different page
    return new RedirectResponse($this->generateUrl('success_route'));
}

1. Define a route for the success page in your routing configuration:

success_route:
    path: /success
    controller: App\Controller\SuccessController::index

1. Create a SuccessController with an index action to display the success page:

public function index()
{
    return $this->render('success.html.twig');
}

1. In your form template, specify the action attribute of the form to point to the form submission route:

<form action="{{ path('form_submit_route') }}" method="post">
    <!-- form fields here -->
    <button type="submit">Submit</button>
</form>

With this implementation, when the user submits the form, they will be redirected to the success page. If they refresh the success page, it will not trigger another form submission.

This approach ensures that form submissions are only processed once, even if the user refreshes the page. It helps prevent duplicate form submissions and provides a better user experience.