giup do ve cach tao mot fields dang select tu mot fields dang select khac

Bạn down module example về rồi xem. Có thể làm bằng ajax rất dễ dàng.

Sorry, I thought that was a private message to me (because I could not read it). Please ignore.

Minh da lam theo example ajax. Nhung co van de ma minh thuc su ko giai thich duoc.

Minh co 2 form , va minh da viet ajax nhu sau

$form['ajouter']['admin_group'] = array(
'#type' => 'select',
'#options' => $admin_users,
'#title' => t('Administrateur du groupe'),
'#ajax' => array(
'callback' => 'gt_configuration_add_form_callback',
'wrapper' => 'get_group',
),
);

$form['ajouter']['nom_group'] = array(
'#type' => 'textfield',
'#title' => 'Nom du groupe',
'#prefix' => '', //cho nay minh k biet sao lai ko the show id = get_group , nhung do k phai van de
'#suffix' => '',// phan nay cung the, bao dam dung
'#disabled' => TRUE,
);

va minh viet function ajax nhu sau :

function gt_configuration_add_form_callback($form,$form_state){
//noi dung cua callback la cung cap values cho form 'nom_group'
$admin_group = $form_state['values']['admin_group'];
$user = user_load(array('uid' => $admin_group));
$search_group = db_select('gt_groups','g')
->fields('g',array('nom'))
->condition('id_group',$user->data['groupe'],'=')
->execute()
->fetchAll();
$form['ajouter']['nom_group']['#value'] = $search_group[0]->nom;
return $form ['ajouter']['nom_group'];
}

Ajax chay tot, form 'nom_group' show dung values ma minh muon. Nhung dieu lam minh ko the hieu duoc la. Khi minh submit, values cua form 'nom_group' tro thanh NULL.
Co ai co the giai thich dieu nay giup minh ko?