How to display a message for unauthorized access

A feature request:
Normally when a custom field (like private_photo) is created, the frontend view of the field will display nothing for public visitors.
However, sometimes we encourage visitors to register to read more, there is a need to display something.
How to display such a message for unauthorized access as the following
demo.jextbox.com/2-uncategorised/2-login-to-read-more-demo.html

Thanks.

interesting thing ...

Hello,
there is work in progress for access

-- FOR ITEM-LEVEL
we are adding (in category,tags,search, etc views) special CSS classes inside code for no-acess items and for items belonging to "featured" categories:

e.g.

-- FOR FIELD-LEVEL (your question)
yes we have thought of this before, in order to do this we would need to add at least 2 parameters to all FLEXIcontent fields:
- parameter to show no-access message or not
- parameter for (language filtered) no-access message

Thank you very much for your quick and responsive reply.
Hoping this feature will make Flexicontent more powerful and flexible.

ggppdk wrote: -- FOR FIELD-LEVEL (your question)
yes we have thought of this before, in order to do this we would need to add at least 2 parameters to all FLEXIcontent fields:
- parameter to show no-access message or not
- parameter for (language filtered) no-access message

I am using LoadModule field to load Fox contact form and this field is only available to Registered user.
I need to inform public users to sign up or login to be able to contact authors.

Regards,

EDIT: Better to have parameter for Class Suffix as well.

Hello,

OK just thinking out loud,
as i said i had though of exactly this several times in the past,

(and just thinking out loud):

-- just now i realized the best way do it:
a. remove ACCESS Level check from the SQL query ... that retrieves the item 'fields'
b. inside flexicontent.fields.php file
instead of calling 'onDisplayField()' we check ACCESS and if no access we set 'display' of field to be the "no access message" along with the CSS class

New field parameters needed (or add them as DB table properties ??):
a. "print_no_access_message"
b. "no_access_message" (language filtered)