Add attribute to all forms

Question

I'd like to add autocomplete="off" to all <form> tag in my symfony project and I'm looking for the best way to do such.

I don't want to change all templates to change {{form_start}} call or manually add attribute on form object in controller, neither add listener or subscriber on each form.

I am looking for a global solution, like a service that change all forms in one call.

Answer 1

I think if it's the default behavior of all your forms, it's better to think about a root solution. Extending type by default will do the trick

class FormTypeExtension extends AbstractTypeExtension
{
    /**
     * Return the class of the type being extended.
     */
    public static function getExtendedTypes(): iterable
    {
        // return FormType::class to modify (nearly) every field in the system
        return [FormType::class];
    }

    public function buildView(FormView $view, FormInterface $form, array $options): void
    {
        if (isset($view->vars['method'])) { // Make sure we're on the base form
            $view->vars['attr']['autocomplete'] = isset($view->vars['attr']['autocomplete']) ? $view->vars['attr']['autocomplete'] : "off"; // let the possibility to override for specific forms
        }
    }
}

you just have to use it like that

class DefaultController extends AbstractController
{

    /**
     * @Route("/", name="home")
     */
    public function home() {

        $form1 = $this->createForm(DemoType::class, new Demo());
        $form2 = $this->createForm(DemoType::class, new Demo(), ['attr' => ['autocomplete' => "on"]]);

        return $this->render('demo.html.twig', ['form1' => $form1->createView(), 'form2' => $form2->createView()]);
    }

}