Question

I am posting a form with Ajax.

I have a surprising response when binding a form within an Ajax call:

public function newCartAjaxAction(Request $request)
{
    $form = $this->container->get('new_cart_form.factory')->create();
    $formHandler = $this->container->get('new_cart_form.handler');

    if ('POST' === $request->getMethod())
    {
        $form->bind($request);

        if ($form->isValid())
        {
            $formHandler->processValidForm($form);

            $response = new Response();
            $response->headers->set('Content-type', 'application/json; charset=utf-8');
            $response->setContent(json_encode('hello'));
            return $response;
        }
        //...
    }

    //....
}

Using firebug, I surprisingly obtain 3 outputs in the ajax Response:

array(2) {[0]=>int(3)[1]=>int(5)}    //unexpected response

int(3)                               //unexpected response

"hello"                              //The only response needed

After debugging, I figured out that output 1 and 2 are from $form->bind($request);

Does anyone know why that is? I am very surprised to obtain a response from the form binding step as the only response that I am supposed to send is $response…

Have I done something wrong?

Answer 1

It’s likely that these outputs were caused by code you’ve written.

First, make sure that your vendors are clean by reinstalling them.
Then, it could also be a form event listener/subscriber that you’ve written, so have also a look in this way.