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我正在尝试实现 AJAX 回调以根据另一个下拉列表的值更改下拉列表选项。我已经查看了在线示例和示例模块中的示例。我正在尝试在其中一个管理页面表单上实现该示例。

为简化起见，我尝试实现以下目标：只需在第一个下拉列表更改后用随机数更改第二个下拉列表的标题。请注意，我使用的是字段集合字段。

function myaction_form_alter(&$form, &$form_state, $form_id) {

$form['field_programme_permission']['und']['0']['field_programme']['und']['#ajax']=array(
        'event' => 'change',
        'callback' => 'programmes_ajax_callback',
        'method' => 'replace',
        'wrapper' => 'countries_wrapper'
      );


$form['field_programme_permission']['und']['0']['field_countries']['und']['#title']=rand(1,100);
return $form;
}

function programmes_ajax_callback($form, $form_state) {    
 return $form['field_programme_permission']['und']['0']['field_countries'];
}

就好像programs_ajax_callback 根本没有被触发。我看到这个 Drupal AJAX 请等待消息，但实际上什么也没发生。奇怪的是，如果我提交表单并且它没有通过验证，我什至看不到这个 Drupal AJAX“请稍候”消息。我已经尽可能地简化了代码以试图找出问题所在，但它没有工作......

有任何想法吗？

4

1 回答 1

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问题是由于 countries_wrapper 实际上并不存在，因为我实际上在其他地方称它为 countries-wrapper。

在下面找到我实际使用过的代码。此代码涵盖多值（最多 10 个）字段集合，其中字段集合中的一个字段（国家）依赖于另一个字段（程序）。希望它会被证明对某人有用。

    function mymodule_form_alter(&$form, &$form_state, $form_id) {

          for($i=0;$i<10;$i++) {
          if(($form_id=='user_register_form') || ($form_id=='user_profile_form')) {

              if(isset($form_state['values']['field_programme_permission'][LANGUAGE_NONE][$i]['field_programme'][LANGUAGE_NONE][0]['tid'])) {
                $programme_selected= $form_state['values']['field_programme_permission'][LANGUAGE_NONE][$i]['field_programme'][LANGUAGE_NONE][0]['tid'];
              } else {
                $programme_selected=0;
              }

              if(isset($form_state['field']['field_programme_permission']['und']['entity'][$i]->field_programme['und'][0]['tid'])){
                 $programme_selected=$form_state['field']['field_programme_permission']['und']['entity'][$i]->field_programme['und'][0]['tid'];
              }

          $form['field_programme_permission'][LANGUAGE_NONE][$i]['field_programme'][LANGUAGE_NONE]['#ajax']=array(
            'event' => 'change',
            'callback' => '_programmes_ajax_callback',
            'method' => 'replace',
            'wrapper' => 'countries_wrapper'.$i
          );
          $form['field_programme_permission'][LANGUAGE_NONE][$i]['field_countries'][LANGUAGE_NONE]['#title']='Countries';

          $form['field_programme_permission'][LANGUAGE_NONE][$i]['field_countries'][LANGUAGE_NONE]['#prefix']='<div id="countries_wrapper'.$i.'">';
          $form['field_programme_permission'][LANGUAGE_NONE][$i]['field_countries'][LANGUAGE_NONE]['#suffix']='</div>';
          $form['field_programme_permission'][LANGUAGE_NONE][$i]['field_countries'][LANGUAGE_NONE]['#options']=_countries_ajax_callback($programme_selected);

        }
        } 
return $form;
}

function _programmes_ajax_callback($form, $form_state) {
//we first need to know the triggering element, to know the index of the countries field that we need to affect.
$index= $form_state['triggering_element']['#field_parents'][2];
return $form['field_programme_permission'][LANGUAGE_NONE][$index]['field_countries'];
}

function _countries_ajax_callback($selected) {

  $programme_value = $selected;
  $options=array();
  if(taxonomy_term_load($programme_value)){
  $programme_taxonomy=taxonomy_term_load($programme_value);
  if(isset($programme_taxonomy->field_countries[LANGUAGE_NONE])) {
  $countries=$programme_taxonomy->field_countries[LANGUAGE_NONE];
  foreach($countries as $country) {
    $country_tid = $country['tid'];
    $country_term = taxonomy_term_load($country_tid);
    $country_name = $country_term->name;
    $options[$country_tid]=$country_name;
  }
  }
  }
  return $options;
}
于 2013-06-22T18:55:14.537 回答