这是可能的改变使使用预处理功能阵列,但在你的情况下,它不是一个好主意。你所说的链接是字段格式化程序的渲染结果。所以,你只需要另一个字段格式化程序为您的'类型'字段,而不是当前的'标签'格式化程序。
创建新的格式化程序非常简单(特别是如果使用EntityReferenceLabelFormatter
作为示例)。假设你有一个叫做entity_reference_link_formatter
的模块。然后在这个模块的目录中创建src/Plugin/Field/FieldFormatter
文件夹,放在那里以下EntityReferenceLinkFormatter.php
文件:
<?php
/**
* @file
* Contains Drupal\entity_reference_link_formatter\Plugin\Field\FieldFormatter\EntityReferenceLinkFormatter
*/
namespace Drupal\entity_reference_link_formatter\Plugin\Field\FieldFormatter;
use Drupal\Core\Entity\Exception\UndefinedLinkTemplateException;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceFormatterBase;
use Drupal\Core\Form\FormStateInterface;
/**
* Plugin implementation of the 'entity reference link' formatter.
*
* @FieldFormatter(
* id = "entity_reference_link",
* label = @Translation("Link"),
* description = @Translation("Display the link to the referenced entity."),
* field_types = {
* "entity_reference"
* }
*)
*/
class EntityReferenceLinkFormatter extends EntityReferenceFormatterBase {
/**
* {@inheritdoc}
*/
public static function defaultSettings() {
return [
'text' => 'View',
] + parent::defaultSettings();
}
/**
* {@inheritdoc}
*/
public function settingsForm(array $form, FormStateInterface $form_state) {
$elements['text'] = [
'#title' => t('Text of the link to the referenced entity'),
'#type' => 'textfield',
'#required' => true,
'#default_value' => $this->getSetting('text'),
];
return $elements;
}
/**
* {@inheritdoc}
*/
public function settingsSummary() {
$summary = [];
$summary[] = t('Link text: @text', ['@text' => $this->getSetting('text')]);
return $summary;
}
/**
* {@inheritdoc}
*/
public function viewElements(FieldItemListInterface $items, $langcode) {
$elements = array();
foreach ($this->getEntitiesToView($items, $langcode) as $delta => $entity) {
if (!$entity->isNew()) {
try {
$uri = $entity->urlInfo();
$elements[$delta] = [
'#type' => 'link',
'#title' => t('!text', ['!text' => $this->getSetting('text')]),
'#url' => $uri,
'#options' => $uri->getOptions(),
];
if (!empty($items[$delta]->_attributes)) {
$elements[$delta]['#options'] += array('attributes' => array());
$elements[$delta]['#options']['attributes'] += $items[$delta]->_attributes;
// Unset field item attributes since they have been included in the
// formatter output and shouldn't be rendered in the field template.
unset($items[$delta]->_attributes);
}
}
catch (UndefinedLinkTemplateException $e) {
// This exception is thrown by \Drupal\Core\Entity\Entity::urlInfo()
// and it means that the entity type doesn't have a link template nor
// a valid "uri_callback", so don't bother trying to output a link for
// the rest of the referenced entities.
}
}
$elements[$delta]['#cache']['tags'] = $entity->getCacheTags();
}
return $elements;
}
}
启用这个模块后(或清除缓存,如果这个模块是较早启动后),您将有“链接”格式化为所有'实体引用'字段,允许您在格式化程序设置中自定义链接文本。