I have a taxonomy reference field and in the node creation form there will be only one value allowed and I guess I use a radio button and I want it to be enabled by default.

I thought I can do it with form_alter but on inspection in krumo I see the default values are set to the concrete term id.

If I would want to set that id (which I do not know) it could look like:

 form['field_abteilung'][LANGUAGE_NONE]['#default_value'] = 12345;

For various users and their roles there will be other another allowed option in this form and I just want to do sth like

 form['field_abteilung'][LANGUAGE_NONE].... My-single-radio-button = checked;


I saw I can find out the single option by looking into


I tried it but get an error about missing index 'field_sektion' which confuses me.

update 2 It takes some time, I maybe should have mentioned that the field in the end should be the access control field of https://drupal.org/project/workbench_access , that module also alters the form; I disabled the field's access function first and now need to rebuild all

  • 1
    A radio group is used to indicate more than one choice. From a UI/UX perspective you should probably reconsider your approach. Standard fare would be to convert the field to a 'value' type, which is hidden from display on the front end
    – Clive
    Commented Aug 28, 2013 at 10:45
  • I agree , could you tell me how to make it a value type (it is a term reference...) Commented Aug 28, 2013 at 10:51
  • You'd probably get away with something as simple as $form['field_sektion'][LANGUAGE_NONE]['#type'] = 'value'; as long as you have a #default_value set. Give that a try and if it causes any problems just update the question with the code and I'm sure you'll get it fixed
    – Clive
    Commented Aug 28, 2013 at 10:54

1 Answer 1


the way I did it now, is following - First I tried to use a hook provided by workbench access itself which supposed to be for that use case, look here https://drupal.org/node/2019473

But it would not work for me, so I did : this results in a select box with only one possibility. Not the best UX style maybe and later I will try to hide the element, maybe with ds module.

function workbench_access_crud_by_state_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id != 'hardware_antrag_node_form') {
  $option_arr = $form['field_tu'][LANGUAGE_NONE]['#options'];
  // remove 'none'-option

  // look for field for workbench_access and replace options
  $wb_access_field = $form['workbench_access_fields']['#value'][0];
  $form[$wb_access_field][LANGUAGE_NONE]['#options'] = $option_arr;

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