Hide a CCK fieldgroup using #states in hook_form_alter()?

Question

I have a custom module, and I am trying to hide a CCK fieldgroup using "#states" when a certain item is selected in a drop-down select list.

I have tried using states from within hook_form_alter(), like so:

$form['group_mygroup']['#states']['invisible'] = array(
  ':input[name="field_trigger[' . LANGUAGE_NONE. ']"]' => array( 'value' => 'hide' ),
);

This doesn't seem to do anything.

I have looked at changing the weight of my module as per various sites like http://proofgroup.com/blog/2008/dec/modifying_cck_fieldgroups_hook_form_alter.

but still to no avail. I can hide all the form elements within the fieldgroup using states but not the field group itself. Does anyone have any idea?

Answer 1

/**
 * Implements hook_field_group_build_pre_render_alter.
 */
function mymodule_field_group_build_pre_render_alter(&$element) {
  if (isset($element['#form_id'])) {
    if ($element['#form_id'] == 'mynodetype_node_form') {
      $element['group_myfieldgroup']['#states'] = array(
        'visible' => array(
          ':input[name="field_myfield[und]"]' => array('checked' => TRUE),
        )
      );
      $element['group_myfieldgroup']['#id'] = 'group_myfieldgroup';
    }
  }
}

I use this hook to hide my field group. It's visible only if the checkbox field_myfield is checked.

To explore $element variable in this hook I used

die('<pre>'.print_r($element, 1).'</pre>');

instead of dpm().

Hope it helped :)

Answer 2

Fieldgroups aren't defined in the root of $form. It seems you should use not $form['group_mygroup'], but $form['#fieldgroups']['group_mygroup'].

Answer 3

You can look at the example module to see how they hide fieldsets. Based on that I think your code should be:

$form['group_mygroup']['#states'] = array(
  'invisible' => array(
    ':input[name="field_trigger"]' => array('value' => 'hide'),
  ),
),