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我正在尝试使用选择框中第一个选定内容类型名称的所有日期字段填充第二个选择框。我正在使用 ajax_callback 通过 $form_state 获取选定的值。我收到错误，我无法确定原因。有人可以帮忙吗？

这是我的自定义模块代码。

function mymodule_settings($form, &$form_state){
  $content_type_options = array();
  $result = db_query("SELECT * FROM {node_type}");  
  foreach($result as $record){
    $content_type_options[$record->type]  =  $record->name;  
  }
  $form = array();
  $form['content_type'] = array(
    '#title'  => t('Content Types'),
    '#description'  => t('Select a content type.'),
    '#type' => 'select',
    '#options'  => $content_type_options,
    '#ajax' => array(
      'event' => 'change',
      'wrapper' => 'reg-start-date',
      'callback' => 'mymodule_datefields_ajax_callback',
      'method' => 'replace',
    ),
  );
  $form['checkboxes_fieldset'] = array(
    '#title' => t("Start Date"),
    '#prefix' => '<div id="reg-start-date">',
    '#suffix' => '</div>',
    '#type' => 'select',
    '#description' => t('Select the date field'),
  );
  $form['submit'] = array(
    '#type' => 'submit',
    '#value'  => t('Save'),
  );
  return $form;
}

function mymodule_datefields_ajax_callback($form, $form_state) {
  $fieldname = $form_state['triggering_element']['#value'];

  $field_query = db_query("SELECT fc.field_name FROM {field_config} fc, {field_config_instance} fci
                          WHERE fc.field_name = fci.field_name
                          AND fc.type = 'datetime'
                          AND fci.bundle = '".$fieldname."'");
  $datefield_options = array();
  foreach($field_query as $record){
    $datefield_options = $record;
  }
  return $datefield_options;
  //dpm($form_state, 'AJAX $form_state');
}

这是我在弹出窗口中遇到的错误-

发生 AJAX HTTP 错误。HTTP 结果代码：200 调试信息如下。路径：/module_dev/?q=system/ajax StatusText：OK ResponseText：致命错误：无法在 /var/www/module_dev/includes/common.inc 的第 5786 行使用 stdClass 类型的对象作为数组

我浏览了第 5786 行的 /var/www/module_dev/includes/common.inc，这是我在那里找到的代码。

function drupal_render(&$elements) {
  // Early-return nothing if user does not have access.
  if (empty($elements) || (isset($elements['#access']) && !$elements['#access'])) {
    return;
  }

  // Do not print elements twice.
  if (!empty($elements['#printed'])) {
    return;
  }

  // Try to fetch the element's markup from cache and return.
  if (isset($elements['#cache'])) {
    $cached_output = drupal_render_cache_get($elements);
    if ($cached_output !== FALSE) {
      return $cached_output;
    }
  }

  // If #markup is set, ensure #type is set. This allows to specify just #markup
  // on an element without setting #type.
  if (isset($elements['#markup']) && !isset($elements['#type'])) {
    $elements['#type'] = 'markup';
  }

  // If the default values for this element have not been loaded yet, populate
  // them.
  if (isset($elements['#type']) && empty($elements['#defaults_loaded'])) {
    $elements += element_info($elements['#type']);
  }

  // Make any final changes to the element before it is rendered. This means
  // that the $element or the children can be altered or corrected before the
  // element is rendered into the final text.
  if (isset($elements['#pre_render'])) {
    foreach ($elements['#pre_render'] as $function) {
      if (function_exists($function)) {
        $elements = $function($elements);
      }
    }
  }

  // Allow #pre_render to abort rendering.
  if (!empty($elements['#printed'])) {
    return;
  }

  // Get the children of the element, sorted by weight.
  $children = element_children($elements, TRUE);

  // Initialize this element's #children, unless a #pre_render callback already
  // preset #children.
  if (!isset($elements['#children'])) {
    $elements['#children'] = '';
  }
  // Call the element's #theme function if it is set. Then any children of the
  // element have to be rendered there.
  if (isset($elements['#theme'])) {
    $elements['#children'] = theme($elements['#theme'], $elements);
  }
  // If #theme was not set and the element has children, render them now.
  // This is the same process as drupal_render_children() but is inlined
  // for speed.
  if ($elements['#children'] == '') {
    foreach ($children as $key) {
      $elements['#children'] .= drupal_render($elements[$key]);
    }
  }

  // Let the theme functions in #theme_wrappers add markup around the rendered
  // children.
  if (isset($elements['#theme_wrappers'])) {
    foreach ($elements['#theme_wrappers'] as $theme_wrapper) {
      $elements['#children'] = theme($theme_wrapper, $elements);
    }
  }

  // Filter the outputted content and make any last changes before the
  // content is sent to the browser. The changes are made on $content
  // which allows the output'ed text to be filtered.
  if (isset($elements['#post_render'])) {
    foreach ($elements['#post_render'] as $function) {
      if (function_exists($function)) {
        $elements['#children'] = $function($elements['#children'], $elements);
      }
    }
  }

  // Add any JavaScript state information associated with the element.
  if (!empty($elements['#states'])) {
    drupal_process_states($elements);
  }

  // Add additional libraries, CSS, JavaScript an other custom
  // attached data associated with this element.
  if (!empty($elements['#attached'])) {
    drupal_process_attached($elements);
  }

  $prefix = isset($elements['#prefix']) ? $elements['#prefix'] : '';
  $suffix = isset($elements['#suffix']) ? $elements['#suffix'] : '';
  $output = $prefix . $elements['#children'] . $suffix;

  // Cache the processed element if #cache is set.
  if (isset($elements['#cache'])) {
    drupal_render_cache_set($output, $elements);
  }

  $elements['#printed'] = TRUE;
  return $output;
}
4

1 回答 1

0

你的 AJAX 回调应该返回的是一个表单元素的渲染数组，它替换了<div>CSS ID 设置为 #ajax[wrapper] 的标签的内容。您的 AJAX 回调返回的是一个对象数组，这不是渲染 API 所期望的。（渲染 API 使用数组。）这就是为什么您会收到错误消息，指出对象不能用作数组。

请参阅ajax_example_simplest()作为使用 AJAX 的表单构建器的示例；特别是，请参阅它的 AJAX 回调ajax_example_simplest_callback()。

简而言之，mymodule_datefields_ajax_callback()应该是下面的代码。

function mymodule_datefields_ajax_callback($form, $form_state) {
  return $form['checkboxes_fieldset'];
}

表单构建器应使用以下代码。

function mymodule_settings($form, &$form_state){
  $content_type_options = array();
  $result = db_query("SELECT * FROM {node_type}");  
  foreach ($result as $record) {
    $content_type_options[$record->type]  =  $record->name;  
  }

  // $form is already passed as argument; you don't need to initialize it to an empty array.
  // $form = array();

  $form['content_type'] = array(
    '#title'  => t('Content Types'),
    '#description'  => t('Select a content type.'),
    '#type' => 'select',
    '#options'  => $content_type_options,
    '#ajax' => array(
      'event' => 'change',
      'wrapper' => 'reg-start-date',
      'callback' => 'mymodule_datefields_ajax_callback',
      'method' => 'replace',
    ),
  );

  // An AJAX request call to the form builder function has been done.
  if (!empty($form_state['values']['content_type'])) {
    // Use $form_state['values']['content_type'] to get the option list.
    // Set the value of $date_options with that list.
    $field_query = db_query("query to execute");
    $date_options = array();

    foreach ($field_query as $record) {
      $date_options[$record->field_name] = $record->field_name;
    }
  }
  else {
    $date_options = array();
  }

  $form['checkboxes_fieldset'] = array(
    '#title' => t("Start Date"),
    '#prefix' => '<div id="reg-start-date">',
    '#suffix' => '</div>',
    '#type' => 'select',
    '#options' => $date_options,
    '#description' => t('Select the date'),
  );

  $form['submit'] = array(
    '#type' => 'submit',
    '#value'  => t('Save'),
  );

  return $form;
}

$date_options是格式为的数组value => string_to_show；它与您使用的格式相同$content_type_options。

于 2013-01-21T09:58:46.450 回答