[support] is it possible to have validation using CCK fields?

[btully at about.com]

thanks a bunch Larry.

so I can create a module that only includes one function - an instance of
hook_form_alter?

also how would I specify which form it is I want to validate, i.e. how
does Drupal know?

Can hook_form_alter also modify the form fields that have been created
within CCK, such as adding extra attributes not visible through CCK's add
form UI? If so this would be super as I would like to add #prefix and
#suffix tags to several form elements but the CCK UI does not allow for
this.

also, I found this link a few hours ago <http://drupal.org/node/134289>
which suggests creating a module that uses hook_nodeapi and specifying
code within the 'validate' case. Can this work as well?

> No, CCK does not.
>
> However, FAPI does. :-)  You can use hook_form_alter() in your own module
> somewhere to add another validation function to the form.  In that
> validation
> function, just set a form error if you don't like what the user's doing.
> FAPI will take care of rejecting the form and showing it back to the user
> with your message.  That the form is built with CCK is irrelevant to this
> task.
>
> Cheers.
>
> On Tuesday 05 June 2007, Brian Tully wrote:
>> hey there -
>>
>> I'm looking to use CCK fields for defining if an article is exclusive to
>> a role of users along with a specified timeframe.
>>
>> Is it possible to utilize some sort of validation whereby if a role is
>> specified then a startdate and enddate must be specified?
>>
>> The trick is that if they specify a role, I need them to also specify a
>> startdate and enddate.
>>
>> Does the CCK module allow for hooks to alter the form and/or specify
>> more advanced validation rules?
>>
>> i've read about node_alter_form and hook_alter_form, but how does one
>> use them with CCK fields?
>>
>> Any advice would be greatly appreciated.
>>
>>
>> regards,
>> brian
>
>
> --
> Larry Garfield			AIM: LOLG42
> larry at garfieldtech.com		ICQ: 6817012
>
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> exclusive property, it is the action of the thinking power called an idea,
> which an individual may exclusively possess as long as he keeps it to
> himself; but the moment it is divulged, it forces itself into the
> possession
> of every one, and the receiver cannot dispossess himself of it."  --
> Thomas
> Jefferson
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