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获取Drupal自定义字段值并显示的方法

发布时间:2018-04-10 12:24作者:admin来源:未知点击:

在Drupal获取一个自定义字段的值最常用的方法是:

$nianling = $node->field_nianling[LANGUAGE_NONE][0]['value'];

不过当field_nianling内容为空时,会出现类似这样的错误: Notice: Undefined index: value in eval() ,如果我们在在取值之前加个判断,如这样:

if (isset(field_nianling[LANGUAGE_NONE])) {
    $nianling = $node->field_nianling[LANGUAGE_NONE][0]['value'];
 
}

是可以解决问题,但如果字段多时,代码看起来就不够简洁,而且如果自定义字段是列表字段,就有可能还需要根据列表的 key 获取相应的 value 值。那么有没有更好的方法来获取自定义字段的值呢?
 
Drupal已经给我们提供了一个 <a href="https://api.drupal.org/api/drupal/modules%21field%21field.module/function/field_get_items/7">field_get_items</a> 函数,原型如下:
function field_get_items($entity_type, $entity, $field_name, $langcode = NULL)
函数说明:
返回当前语言的此字段项目。
 
参数:
 
$entity_type: The type of $entity; e.g., 'node' or 'user'.
 
$entity: The entity containing the data to be displayed.
 
$field_name: The field to be displayed.
 
$langcode: (optional) The language code $entity->{$field_name} has to be displayed in. Defaults to the current language.
 
Return value
 
An array of field items keyed by delta if available, FALSE otherwise.
 
 
 
得到了 field_get_items 的返回字段项目,就可以使用 <a href="https://api.drupal.org/api/drupal/modules!field!field.module/function/field_view_value/7">field_view_value</a> 来渲染单个项目值:
 
field_view_value($entity_type, $entity, $field_name, $item, $display = array(), $langcode = NULL)
Returns a renderable array for a single field value.
 
Parameters
 
$entity_type: The type of $entity; e.g., 'node' or 'user'.
 
$entity: The entity containing the field to display. Must at least contain the id key and the field data to display.
 
$field_name: The name of the field to display.
 
$item: The field value to display, as found in $entity->field_name[$langcode][$delta].
 
$display: Can be either the name of a view mode, or an array of display settings. See field_view_field() for more information.
 
$langcode: (Optional) The language of the value in $item. If not provided, the current language will be assumed.
 
<strong>返回值 </strong>指定字段的渲染数组
下面是一个显示 field_jinsheng 字段的例子代码:

$jinsheng = field_get_items('node', $node, 'field_jinsheng');
$output = field_view_value('node', $node, 'field_jinsheng', $jinsheng[0]) ;

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