Dynamically hide fields in a form

[Dax Mitchell]

Hi,

We have a setup like below.  We would really like to hide the password and verify_password fields in the form based on some some conditions which will vary based on parameters set elsewhere (sometimes it's very confusing to show those fields).

The closest thing I could find is this post, which suggests "copying the dynamic field declaration inside the __field_widgets__ property" 

It would be very helpful to see an example, or any other suggestions would be very much appreciated.

class UserAdminConfig(UserControllerConfig):

    ...

    class defaultCrudRestController(ResourceManagerCrudRestController):

       ...

        __form_options__ = {

            '__require_fields__': ['user_name', 'email_address'],

            '__omit_fields__': ['_password', 'created', '_groups', '_reset_password_key',

                                'reset_password_key', 'reset_password_expires'],

            '__hide_fields__': ['user_id'],

            '__field_order__': ['user_name', 'email_address', 'display_name', 'groups',

                                'password', 'verify_password'],

            '__field_widget_types__': addopts(user_name=TextField,

                                              email_address=TextField,

                                              display_name=TextField),

            '__field_widget_args__': addopts(password=CUSTOM_FORM_FIELD_OPTIONS)

        }

[Alessandro Molina]

Is https://tw2core.readthedocs.io/en/develop/forms/#dynamic-forms what you are looking for? How to dynamically add/remove fields to a TW2 form?

When you have such more complex customization needs I start to feel it's usually best to switch to hand made TW2 forms where you can inject complex logic in prepare and post_define.

You might be able to do what you want btw, by providing a `__base_widget_type__` to the __form_options__

That will allow you to provide a subclass of tw2.forms.TableForm (or anything else) with a prepare method that hides/removes some fields based on `tg.request.params` or whatever condition you need.  Look at that tw2 docs link, it should explain how to edit the fields of a form during a request and then it should just be a matter of passing your own custom subclass of Form as the __base_widget_type__

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[Dax Mitchell]

Thanks very much, I appreciate the guidance

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