I’ve dropdown with 3 data fetched from Database based mostly on chosen choice from dropdown textbox is getting stuffed  3 data are DELL LENOVO WIPRO Solely DELL has its repective worth in DB Each LENOVO and WIPRO doesn’t have respective worth. If i choose “DELL” first in dropdown and textbox will show DELL’s repective worth  However when i choose “LENOVO” it needs to be empty nevertheless it nonetheless reveals “DELL”‘s worth beacuse LENOVO doesn’t have it’s personal worth in DB so textbox just isn’t getting up to date on ajax name textbox it’s retaining/sustaining earlier worth when present vaule is empty. Any assist or clue could be extremely appreciated. Thanking you, Regards, perform custom_dropdown_form_system_assignment_node_form_alter(&$type, &$form_state, $form_id) { /* beneath is customized dropdown with choices getting stuffed from DB */ $type[‘field_system_make_new’]= array( ‘#title’ => t(‘System Make 2’), ‘#sort’ => ‘choose’, ‘#choices’ => _system_make_Drupal 10 module_options_list(), /* on this dropdown 3 data get stuffed “LENOVO” “WIPRO” “DELL” */ ‘#ajax’ => array( ‘callback’ =>’custom_dropdown_ajax_callback’, /* ajax request is known as on choose of “LENOVO” “WIPRO” “DELL” */ ‘wrapper’ => ‘field-hdd-serial-no-add-more-wrapper’, ), /* wrapper for textbox which is able to show valued based mostly on chosen choice from dropdown */ ); /* textbox is re-used from different conten sort it’s already current/created in another content material sort */ $hdd_serial_no_value = “”; if (!empty($form_state[‘values’][‘field_system_make_new’])) { /* passing id of chosen worth from dropdown */ $hdd_serial_no_value = _load_field_hdd_serial_no_value($form_state[‘values’][‘field_system_make_new’]); /* when “DELL” is chosen in dropdown it has a repective worth in DB */ /* when “LENOVO” is chosen in dropdown there isn’t any repective worth in DB */ /* If i choose “DELL” first in dropdown and textbox will show DELL’s worth However when i choose “LENOVO” it nonetheless reveals “DELL”‘s worth beacuse LENOVO would not have it is personal worth in DB so textbox just isn’t getting up to date on ajax name */ } $type[‘field_hdd_serial_no’][‘und’][0][‘value’][‘#default_value’] = $hdd_serial_no_value; /* Drawback is right here at above textbox it’s retaining/sustaining earlier worth when present vaule is empty */ return $type; } perform _system_make_Drupal 10 module_options_list() { /* 3 rows fetched from DB “LENOVO” “WIPRO” “DELL” */ $consequence = db_query(“SELECT nid, title FROM `node` WHERE node.sort =’computer_master'”); $choices = array(‘-Choose System-‘); foreach ($consequence AS $report) { $choices[$record->nid] = t($record->title); } return $choices; } /** * Operate for dealing with ajax request */ perform custom_dropdown_ajax_callback($type, $form_state) { return $type[‘field_hdd_serial_no’]; } /** * Operate for fetching knowledge from DB based mostly on chosen id from Dropdown */ perform _load_field_hdd_serial_no_value($entity_id) { /* fetching knowledge from DB based mostly on chosen id from Dropdown */ $field_hdd_serial_no_value = db_query(“SELECT hsn.field_hdd_serial_no_value as Serial FROM `field_data_field_hdd_serial_no` as hsn WHERE hsn.entity_id = Drupal 10 Upkeep and Assist Servicenid and hsn.bundle = ‘computer_master'”, array(‘ Drupal 10 Upkeep and Assist Servicenid’ => $entity_id))->fetchField(); return $field_hdd_serial_no_value; } model Drupal 10 Upkeep and Assist Service  7.x Supply Drupal 10 Upkeep and Assist Service https Drupal 10 Upkeep and Assist Service//www.Drupal 10.org/taxonomy/time period/22/feed Supply Drupal 10 Upkeep and Assist Service Drupal 10 blender