I think it would be very useful to create
client side form validation up on
the symfony2 Form and Validator components.
The best way to do this would be to pass
the validation constraints to
the form view.
With that information it would be possible to make a template that renders a form field to something like this:
<div>
<label for="form_email">E-Mail</label>
<input
id="form_email" type="text" name="form[email]" value=""
data-validation-constraints='["NotBlank":{},"MinLength":{"limit":6}]'
/>
</div>
The JavaScript part then would be to find all <input> elements that have
the data-validation-constraints attribute and create
the correct validation for them.
To pass
the validation constraints to
the form view i thought
the best way would be to create a form type extension. That's
the point of my Question: Is this
the correct way? And how is this possible?
At
the Moment my form type extension looks like this:
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\Form\FormBuilder;
class FieldTypeExtension extends \Symfony\Component\Form\AbstractTypeExtension{
public function getExtendedType(){
return 'field';
}
public function buildView(FormView $view, FormInterface $form)
{
// at this point i didn't find a way to get
the
// validation constraints out of
the $form
//
the `getAllValidationConstraints` here is just an example
$view->set('validation_constraints', $form->getAllValidationConstraints());
}
}
How can i get all validation constraints applied to one form field out of
the FormInterface object?
