By dazmcg on

I am writing a module whereby I use form_alter to generate a custom form for a CCK type. I am trying to figure out how to change CCK field attributes for the form - say using form_alter. There's a post that describes how to play around with the #disabled attribute (http://drupal.org/node/336355 and http://drupal.org/node/300705#comment-985105), but I cannot use it to alter any other attributes.

In particular I'm trying to work out how to set #default_value - so that I can have a form, linked to a CCK type, with a field that takes a URL, a 'lookup' button which has an action associated with it whereby it goes off to the URL, scrapes information and then populates various fields on the form - by setting the default values of the fields and then sets form_rebuild to true. I can do this with the non-cck fields, but have gotten stuck on how to do this for CCK fields....

After many many hours going around in circles, help would be appreciated ALOT!!

thanks

⋅ Categories: Drupal 6.x

Comments

dazmcg’s picture

dazmcg commented

Here's some of the code I'm currently working with:

<?php
function test1_form_alter(&$form, &$form_state, $form_id) {

  if (isset($form['type']) && isset($form['#node'])&&($form_id == 'kg_media_type_node_form')){
    $form['#pre_render'][] = 'my_process_function';  	
  }
}

function my_process_function($form,&$form_state) {
  
  //$form['field_kg_url']['#default_value'] = "well";
  print_r(array_keys($form['field_kg_url']));
  print_r($form['field_kg_url']);
  $form['field_kg_url'][0]['#default_value']['value'] = "well1";
  $form['field_kg_url'][0]['value']['#default_value'] = "well2";
  $form['field_kg_url'][0]['#value']['value'] = "well3";  
  print_r($form['field_kg_url']);
  print_r(array_keys($form_state));
  print_r($form_state);
  
  $form_state['rebuild'] = TRUE;
  echo "\n------------------\n";
  return $form;
?>

I also get these drupal error messages, but i think that's a separate issue:


    * warning: Missing argument 2 for my_process_function(), called in /home/web/active/drupal-6.10/includes/common.inc on line 2820 and defined in /home/web/active/drupal-6.10/sites/all/modules/making/test1/test1.module on line 46.
    * warning: Missing argument 2 for my_process_function(), called in /home/web/active/drupal-6.10/includes/common.inc on line 2820 and defined in /home/web/active/drupal-6.10/sites/all/modules/making/test1/test1.module on line 46.

and the field_kg_url doesn't have any default value when I load the form.....I tried setting all the places in the element I could see a value being held.....also form_state seems to be empty? is that ok?

help much obliged!!!!!!

markus_petrux’s picture

markus_petrux commented

Alter #default_value directly from hook_form_alter() as in this example, should work. Also, make sure your module is loaded after CCK and maybe also after fielgroup by altering the weight of your module in the {system} table.

Use print_r($form['field_myfield']); to figure out the structure of the form element that you wish to modify. Not all fields have the same format.

Doubt is the beginning, not the end of wisdom.

markus_petrux’s picture

markus_petrux commented

If you ever need to use #pre_render, be sure to use the correct prototype.

// This is invoked from drupal_render() in includes/common.inc
// drupal_render() is used by FAPI to render forms, but also by node module to render node view.
function mymodule_pre_render($elements) {
  // Do what you need here to alter the structure is about to be rendered.
  return $elements;
}

http://api.drupal.org/api/function/drupal_render/6

Doubt is the beginning, not the end of wisdom.