如何在 Drupal8 中向 "Site Infomation" 表单添加新的自定义字段

How to add a new custom field to "Site Infomation" Form in Drupal8

我想在 Drupal8 中向 "Site Infomation" 表单添加一个新的自定义字段。我尝试了很多答案,但没有得到正确的解决方案。有没有办法添加自定义字段。请建议。提前致谢。

考虑模块名称是 mymodule。

mymodule.services.yml 文件示例

在您的 mymodule.services.yml

中注册一个事件订阅者
services:
  bssa.route_subscriber:
    class: Drupal\bssa\Routing\RouteSubscriber
    tags:
      - { name: event_subscriber }

class : "Drupal\mymodule\Routing\RouteSubscriber" 根据此 class 创建一个 php 文件,如下所示。

扩展 RouteSubscriber 以实现新的字段形式 mymodule/src/Routing/RouteSubscriber.php

<?php 
namespace Drupal\mymodule\Routing;

use Drupal\Core\Routing\RouteSubscriberBase;
use Symfony\Component\Routing\RouteCollection;

/**
 * Listens to the dynamic route events.
 */
class RouteSubscriber extends RouteSubscriberBase {

  /**
   * {@inheritdoc}
   */
  protected function alterRoutes(RouteCollection $collection) {
    if ($route = $collection->get('system.site_information_settings')) 
      $route->setDefault('_form', 'Drupal\mymodule\Form\ExtendedSiteInformationForm');
  }

}

现在在mymodule/src/Form/ExtendedSiteInformation.php中创建一个新表单来添加自定义字段

<?php

namespace Drupal\mymodule\Form;

use Drupal\Core\Form\FormStateInterface;
use Drupal\system\Form\SiteInformationForm;


class ExtendedSiteInformationForm extends SiteInformationForm {

   /**
   * {@inheritdoc}
   */
      public function buildForm(array $form, FormStateInterface $form_state) {
        $site_config = $this->config('system.site');
        $form =  parent::buildForm($form, $form_state);
        $form['site_information']['siteapikey'] = [
            '#type' => 'textfield',
            '#title' => t('Site API Key'),
            '#default_value' => $site_config->get('siteapikey') ?: 'No API Key yet',
            '#description' => t("Custom field to set the API Key"),
        ];

        return $form;
    }

      public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->config('system.site')
          ->set('siteapikey', $form_state->getValue('siteapikey'))
          ->save();
        parent::submitForm($form, $form_state);
      }
}

现在创建一个配置变量来保存 mymodule/config/schema/mymodule 中新字段的值。schema.yml

# We want to extend the system.site configuration
system.site:
  mapping:
    # Our field name is 'siteapikey'
    siteapikey:
      type: label
      label: 'Site API Keys'

按照上述步骤清除缓存后,您将在 "Site Information" 表单中看到一个新字段 "Site API Key"。