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the need seems simple but I don't find anything about this.

I'd like to add descriptions (div class="description"), non related to specific cck fields. I though I could use these to compute informations inside it (to sum up some of the choices of tricky content types) or to show up an information when choosing a particular option (like, to show a "cck description" rather than a true cck widget when using conditionnal field).

template.php does not seems to be the right way : I got a lot of ccks, and a lot of content types, I just cant create a hook for each case I need this is not flexible enough. I suppose.

is there any 'dummy' cck field with just a description array and no widget I could use like a normal cck, and locate as any other cck in my forms ? or : how could I write a 'cck description' module (I'm ok with php and drupal module simple setup)

Im using D6.x

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it sounds like you want a custom div to show for certain form values ... or on some conditional ajaxy thing on the form ...

I would basically use hook_form_alter with a case statement probably, or some use of nested array keys to add #prefix elements into the form.

The simplest example would be:

function MYMODULE_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'my_content_type_node_add') {
    $form['field_FOO']['#prefix'] = '<div class="description">a description goes here...</div>';
  }
}

You said you had a million of these, all over the place ... no big deal. Somewhere in your module as a variable or tucked away in a function:

// A simple array lookup of $form_id => $fields => $descriptions ...
$descriptions_map = array(
  'my_content_type_node_add' => array(
    'field_FOO' => 'a description goes here ....',
     ),
    'field_ANOTHER_BAR' => '...',
  ),
  'some_other_content_type' => array ...,
);

Using this simple lookup table (which could help tidy up your code) ... you then make hook_form_alter use it by looking at the array keys and eventually setting form values ... I'm leaving out an ugly bit of code with for loops and calling like array_keys but ...

$form[$field_key]['#prefix'] = $field_key_description;
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