Is it possible to create custom form field attributes in Symfony 2?

Question

In Symfony2 form component is it possible to create custom attributes?

The reason why I ask is because I'm working on a certain edge case where read_only will not be sufficient.

Here is the scenario: I need to bind data based on the outcome of some external logic parsing. This is crucial because I may have fields that are disabled by default but based on the external logic the fields may be activated. I cannot use client scripting to produce this outcome, it has to be disabled in the form attribute.

If I start with the field as read_only, it will be disabled, but I will never be able to bind data to it. So given the outcome of my aforementioned external logic, I will not be able to use read_only. So this leaves me with no other option but using a different attribute which will make the field disabled.

Is it possible to create a custom attribute to produced this disabled effect?

Answer 1

I'm not sure I've understood your question correctly; do you want to add arbitrary attributes to your form input tags? For example:

<input type="text" name="myInput" myAttr="myValue" />

If this is what you want to do, then this is possible, like so:

$form = $this->createFormBuilder($someObj)
        ->add('myInput', 'text', array(
             'attr' => array('myAttr' => 'myValue')
        )
        ->getForm();

The documentation is here:

http://symfony.com/doc/2.0/reference/forms/types/field.html

Answer 2

Hard to tell exactly what you're looking to do, but sounds like you want dynamically generated forms based on some event, which is described here:

http://symfony.com/doc/2.0/cookbook/form/dynamic_form_generation.html