[development] Searching for AHAH! instead of AHAH?

[jeff at ayendesigns.com]

Almost there. I have the ahah appearing now by using #after_build. I 
guess from what I read that this had something to do with CCK fields 
(such as content profile fields) not cooperating with hook_form_alter 
due to timing.

My (hopefully) last hurdle is probably just a need for another pair of 
eyes. When the change event fires and the throbber spins, I get a 404 
error on the callback.

function test_menu() {
     $items = array();
     $items['test/change_value/callback'] = array(
         'page callback' => 'test_change_callback',
         'access callback' => TRUE,
         'type' => MENU_CALLBACK,
     );

     return $items;
}

function test_form_alter(&$form, &$form_state, $form_id) {
     if ($form_id == 'test_profile_node_form') {
         $form['field_result']['#prefix'] = '<div 
id="field-result-wrapper">';
         $form['field_result']['#suffix'] = '</div>';

       $form['#after_build'][] = 'test_add_ahah';
     }
}

function test_add_ahah($form, $form_state) {

    $ahah = array();

      $ahah['edit-field-test-value'] = array(
        'button' => false,
        'effect' => 'none',
        'event' => 'change',
        'keypress' => NULL,
        'method' => 'replace',
        'progress' => array('type' => 'throbber'),
        'selector' => '#edit-field-test-value',
        'url' => 'test/change_value/callback',
        'wrapper' => 'field-result-wrapper',
      );
    drupal_add_js(array('ahah' => $ahah), 'setting');


    return $form;
}

function test_callback_helper() {
   $form_state = array('storage' => NULL, 'submitted' => FALSE);
   $form_build_id = $_POST['form_build_id'];
   $form = form_get_cache($form_build_id, $form_state);
   $args = $form['#parameters'];
   $form_id = array_shift($args);
   $form_state['post'] = $form['#post'] = $_POST;
   $form_state['ahah_submission'] = TRUE;
   $form['#programmed'] = $form['#redirect'] = FALSE;
   drupal_process_form($form_id, $form, $form_state);
   $form = drupal_rebuild_form($form_id, $form_state, $args, 
$form_build_id);
   return $form;
}

function test_change_callback() {

     $form = test_callback_helper();
     $output= test_do_stuff();
     drupal_json(array('status' => TRUE, 'data' => $output));
     exit();
}