I have a form updating with AJAX on select element change. Easy so far. The problem is that I need to return the form & also an ajax command at the same time.

If I need the form, I just return the $form array and if I need to return an ajax command I use return array('#type' => 'ajax', '#commands' => $commands);. Both works just fine.

The problem is that I don't get it how to combine both of them in the same return object.

Any ideas how can I do that?

  • Check "Ajax Comments" contributed module you will get all the information there. Commented Jun 8, 2012 at 10:32
  • it's not what I need. in ajax comments they return the whole rendered form. I need to return just part of an existing form... Commented Jun 8, 2012 at 10:44

3 Answers 3


As a backup solution, I'll do it this way:

$form['#suffix'] = '<script type="text/javascript">some_function_to_do_what_i_need();</script>';
return $form;

this should work.

  • 1
    did you find a better solution eventually?
    – Bulat
    Commented Apr 9, 2013 at 20:48
  • Why wouldn't you just use $form['#attached']['js'][] = drupal_get_path('module', 'my_module') . '/js/functionality.js'; return $form;?
    – mbomb007
    Commented Apr 26, 2019 at 15:55

You have to pass to drupal_render() the form array, then add it to your $commands as an AJAX command. You should use code similar to the following one.

function my_ajax_form_callback($form, &$form_state) {
  $new_state = array();
  $new_state['build_info'] = $form_state['build_info'];
  $new_state['rebuild'] = TRUE;
  $new_state['values'] = array();
  $new_state += form_state_defaults();

  $new_form_array = drupal_rebuild_form('my_ajax_form_id', $new_state);
  $new_form = drupal_render($new_form_array);

  $commands = array();
  $commands[] = ajax_command_html('#form-container-element-id', $new_form);

  return array('#type' => 'ajax', '#commands' => $commands);
  • I need to return just part of the form, not the whole rebuild, rendered form. Commented Jun 8, 2012 at 11:05
  • Then render the form element and pass it as an ajax command. Same principle I guess.
    – Beebee
    Commented Jun 8, 2012 at 11:11

I would use hook_ajax_render_alter(&$commands) e.g.

function myModule_ajax_render_alter(&$commands) {
  $commands[] = myModule_custom_command('hi');

See the documentation for details.

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