In D7, I have added a field to the article content type. A taxonomy reference with autocomplete. I need to customize the autocomplete behavior.

I tried the following: 1. hook_form_alter to change the autocomplete path 2. hook_menu to register the path as a callback 3. create the callback function and have it do a simple print

Prior to doing this, typing in the field would fire autocomplete as expected. And I also see the communication in the console of firebug. Having made the two changes, I see the new path in the correct place in the form field, but nothing happens when I type in the field other than the characters appearing...the logic isn't fired and firebug shows no communication.

I also tried registering the original autocomplete path with a different callback. Same result.

Below are the functions.

/** * Implements hook_menu(). */ function my_article_menu() { $items['a/categories'] = array( 'page callback' => 'my_article_autocomplete_callback', 'page arguments' => array(1), 'type' => MENU_CALLBACK, );

return $items; } /** * Implements hook_form_alter(). */ function my_article_form_alter(&$form, $form_state, $form_id) { if ($form_id == 'article_node_form') { $form['field_a_categories']['und']['#autocomplete_path'] = 'a/categories'; } }

function my_article_autocomplete_callback($vocabulary_name) { print '***** The vocabulary is ' . $vocabulary_name; }