显示/隐藏元素ajax Drupal

Question

我在页面中显示元素时遇到问题。根据角色收音机的选择，我需要显示|隐藏选择元素。所以我隐藏了这样一个元素：

$form['field_test_field']['#access'] = 0;

但当状态发生变化时，我无法通过绑定1将其恢复。这就是我的片段：

function seven_form_user_register_form_alter(&$form, &$form_state, $form_id) {
    $form['account']['roles']['#ajax'] = array(
        'callback' => 'seven_dynamic_form_ajax_callback',
        'wrapper' => 'replace_droplist',
        'event' => 'change',
    );
    $form['field_test_field']['#prefix'] = '<div id="replace_droplist">';
    $form['field_test_field']['#suffix'] = '</div>';
    $form['account']['roles']['#type'] = 'radios';
    $checkedRole = isset($form_state['values']['roles'])
        ? $form_state['values']['roles'] : 0;
    if ($checkedRole == 0) {
        $form['field_test_field']['#access'] = 1;
    } elseif ($checkedRole == 4) {
        $form['field_test_field']['#access'] = 0;
    } elseif ($checkedRole == 3) {
        $form['field_test_field']['#access'] = 1;
    }
};
function seven_dynamic_form_ajax_callback($form, $form_state) {
    return $form['field_test_field'];
}

谢谢。

Answer 1

<code>
$form['enter_amt'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enter Billable Amount'),
  );
  $form['billable_ctc'] = array(
    '#type' => 'textfield',
    '#title' => t('Billable CTC'),
    '#maxlength' => '15',
    '#field_prefix' => t('Rs.'),
    '#states' => array('invisible' => array(':input[name="enter_amt"]' =>         array('checked' => TRUE), ), ),
  );
  $form['billing_rate'] = array(
    '#type' => 'textfield',
    '#title' => t('Billing rate'),
    '#maxlength' => '7',
    '#field_suffix' => '%',
    '#size' => 3,
    '#attributes' => array('class' => array('auto-width')),
    '#states' => array('invisible' => array(':input[name="enter_amt"]' => array('checked' => TRUE), ), ),
  );
</code>

这段代码使我能够在单击复选框的基础上隐藏和显示特定的表单元素。