Symfony2 : Two forms in a same page

This did the trick for me in Symfony 3 (should also work for Symfony 2):

$form1 = $this->createForm(
    MyFirstFormType::class
);

$form2 = $this->createForm(
    MySecondFormType::class
);

if ($request->isMethod('POST')) {

    $form1->handleRequest($request);
    $form2->handleRequest($request);

    if ($form1->isSubmitted()) {
        // Handle $form1
    } else if ($form2->isSubmitted()) {
        // Handle $form2
    }

}

The problem is that you have two nameless forms (input names like inputname instead of formname[inputname], and thus when you bind the request to your form and it gets validated it detects some extra fields (the other form) and so it is invalid.

The short-term solution is to create a named builder via the form factory, so instead of:

$form = $this->createFormBuilder(null)

you should use:

$form = $this->get("form.factory")->createNamedBuilder("my_form_name")

The long term solution would be to create your own form classes, that way you can keep your form code separate from the controller.

The two forms will be posted.

Try using:

    $this->createNamedBuilder 

instead of

    $this->createFormBuilder

Then in your controller, locate the form by name:

if ($request->request->has("your form name") {
   $form->handleRequest($request);
}

This is how I handle them on my controller :

return $this->render('SgaDemandeBundle:Demande:suivi_avancement.html.twig', 
                     array('form' => $form->createView(), 
                           ........
                           'update' => $formModification->createView()));

This is the html for the second form :

<div class="well">
    <form method="post">
        <div id="form">
            <div>
                <button type="submit" id="form_modification"  
                name="form[modification]">Modification done
                </button>
            </div>
            <input type="hidden" id="form__token" name="form[_token]" 
            value="fFjgI4ecd1-W70ehmLHmGH7ZmNEHAMqXlY1WrPICtK4">
        </div>        
    </form>
</div>

This is my twig rendered :

<div class="well">
    <form method="post" {{form_enctype(update)}} >
        {{ form_widget(update) }}
    </form>
</div>

<div class="well">
    <form method="post" action='' {{form_enctype(form)}} >
        {{ form_widget(form) }}
        <input type="submit" class="btn btn-primary"/>
    </form>
     <div class='errors'>
        {{ form_errors(form) }}
     </div>
</div>

I hope this will help you.

Using Named forms is a viable solution for handling multiple forms, but it can get a little messy, particularly if you're generating forms dynamically.

Another method, as of Symfony 2.3, is to check which submit button was clicked.

For example, assuming that each form has a submit button named 'save':

if ('POST' == $Request->getMethod())
{
    $form1->handleRequest($Request);
    $form2->handleRequest($Request);
    $form3->handleRequest($Request);

    if ($form1->get('save')->isClicked() and $form1->isValid())
    {
        //Do stuff with form1
    }

    if ($form2->get('save')->isClicked() and $form2->isValid())
    {
        //Do stuff with form2
    }

    if ($form3->get('save')->isClicked() and $form3->isValid())
    {
        //Do stuff with form3
    }
}

I believe this has a small amount of additional overhead as compared to the named builder method (due to multiple handleRequest calls), but, in certain cases, it results in cleaner code. Always good to have multiple solutions to choose from. Some of the additional overhead could be alleviated via nested if/else statements, if necessary, but, unless we're talking about dozens of forms per page, the additional overhead is negligible in any case.

Here's an alternate implementation using anonymous functions that minimizes code repetition:

$form1Action = function ($form) use (&$aVar) {
        //Do stuff with form1
    };
$form2Action = function ($form) use (&$anotherVar) {
        //Do stuff with form2
    };
$form3Action = function ($form) use (&$yetAnotherVar) {
        //Do stuff with form3
    };
$forms = [$form1 => $form1Action, 
          $form2 => $form2Action,
          $form3 => $form3Action];

if ('POST' == $Request->getMethod())
{
    foreach ($forms as $form => $action)
    {
        $form->handleRequest($Request);
        if ($form->get('save')->isClicked() and $form->isValid())
        {
            $action($form);
        }
    }
}

Look at the blockprefix :

public function getBlockPrefix()
{
    return 'app_x_form'.$form_id;
}