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我正在使用 Drupal 7 的表单 API 构建一个表单……到目前为止，一切都是犹太洁食；但看起来我撞到了墙。寻找正确方向的指导/点：

用户使用 CAS（中央认证服务）登录。单击表单以创建新记录。

在表单的顶部，我有一个复选框（默认选中），后跟三个字段：ID、姓名、电话和电子邮件。

我使用以下代码预填充这些字段：

<?php
//... other code prior to this function
function user_form_form_start($form, &$form_state) {
    global $user;
    $result = db_query('select u.name, dn.field_full_name_value, pn.field_phone_value, u.mail from field_data_field_full_name dn join field_data_field_phone pn on (dn.entity_id = pn.entity_id) join users u on (pn.entity_id = u.uid) where u.uid = :uid', array(':uid' => $user->uid))->fetchAll();
    $myID = isset($result[0]->name) ? $result[0]->name : "";
    $myFullName = isset($result[0]->field_full_name_value) ? $result[0]->field_full_name_value : "";
    $myPhoneNumber = isset($result[0]->field_phone_value) ? substr($result[0]->field_phone_value, 2) : "";
    $myEmailAddress = isset($result[0]->mail) ? $result[0]->mail : "";

    $form['tab_user'] = array(
        '#type' => 'fieldset',
        '#title' => t('User Details'),
        '#collapsible' => TRUE, // Added
        '#collapsed' => FALSE, // Added
    );
    $form['tab_user']['user_sameAsAuthor'] = array(
        '#type' => 'checkbox',
        '#title' => t('Filling it out for myself'),
        '#default_value' => isset($form_state['object']->user_sameAsAuthor) ? $form_state['object']->user_sameAsAuthor : TRUE,
//    '#required'      => TRUE,
    );
    $form['tab_user'] ['user_id'] = array(
        '#type' => 'textfield',
        '#title' => t('My CAS ID'),
        '#default_value' => isset($form_state['object']->user_id) ? $form_state['object']->user_id : $myID,
//    '#required'      => TRUE,
    );
    $form['tab_user']['user_name'] = array(
        '#type' => 'textfield',
        '#title' => t('Name'),
        '#default_value' => isset($form_state['object']->user_name) ? $form_state['object']->user_name : $myFullName,
//    '#required'      => TRUE,
    );
    $form['tab_user']['user_phone'] = array(
        '#type' => 'textfield',
        '#title' => t('Phone Number'),
        '#default_value' => isset($form_state['object']->user_phone) ? $form_state['object']->user_phone : $myPhoneNumber,
        '#attributes' => array('class' => array('phoneNumberField')),
        '#size' => 20,
//    '#required'      => TRUE,
    );
    $form['tab_user']['user_email'] = array(
        '#type' => 'textfield',
        '#title' => t('E-mail'),
        '#default_value' => isset($form_state['object']->user_email) ? $form_state['object']->user_email : $myEmailAddress,
//    '#required'      => TRUE,
    );
    return $form;
}
//... other code after this function
?>

以上所有的工作都很漂亮！这是我卡住的地方：

如果用户取消选中该复选框，我希望用户输入一个新 ID。基于任何 ID 用户输入，我如何“ajaxically”获取名称、电话和电子邮件进行 LDAP 查找？

非常感谢任何和所有帮助！

编辑：

道歉！忘了提到在我的研究中，我挖掘了表单 API（当然）并注意到textfield（https://api.drupal.org/api/drupal/developer%21topics%21forms_api_reference.html/7.x#textfield）接受ajax属性（https://api.drupal.org/api/drupal/developer%21topics%21forms_api_reference.html/7.x#ajax）。但是，示例代码并没有完全回答我的问题。

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