Add custom fields

Follow this chapter to learn how to add new fields or actions.

It is important to know how this concept is implemented. If a class should be extended, EXT:news will generate a new file containing the original class of the extension itself and all other classes which should extended it.

Take a look at the following 2 working examples:

The files are saved by using the Caching Framework in the directory typo3temp/Cache/Code/news.

1) Add a new field in the backend

To add new fields, use either the extension extension_builder or create the extension from scratch.

The extension key used in this examples is eventnews.

Create the fields

3 files are basically all what you need:


The file ext_emconf.php holds all basic information about the extension like the title, description and version number.


   'title' => 'news events',
   'description' => 'Events for news',
   'category' => 'plugin',
   'author' => 'Georg Ringer',
   'author_email' => '',
   'state' => 'alpha',
   'uploadfolder' => false,
   'createDirs' => '',
   'clearCacheOnLoad' => true,
   'version' => '1.0.0',
   'constraints' => [
      'depends' => [
         'typo3' => '7.6.13-8.7.99',
         'news' => '6.2.0-6.9.99',
      'conflicts' => [],
      'suggests' => [],

SQL definition

Create the file ext_tables.sql in the root of the extension directory with the following content:

# Table structure for table 'tx_news_domain_model_news '
CREATE TABLE tx_news_domain_model_news (
   location_simple varchar(255) DEFAULT '' NOT NULL

TCA definition

The TCA defines which tables and fields are available in the backend and how those are rendered (e.g. as input field, textarea, select field, ...).

In this example, the table tx_news_domain_model_news will be extended by a simple input field. Therefore, create the file Configuration/TCA/Overrides/tx_news_domain_model_news.php.

defined('TYPO3') or die();

$fields = [
   'location_simple' => [
      'exclude' => 1,
      'label' => 'My location',
      'config' => [
         'type' => 'input',
         'size' => 15

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns('tx_news_domain_model_news', $fields);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCAtypes('tx_news_domain_model_news', 'location_simple');

Install the extension

Now you should be able to install the extension and if you open a news record, you should see the new field in the last tab.

2) Register the class

Until now, EXT:news won't use the new field because it doesn't know about it. To change that, you need to register your new model.


Create the file ext_localconf.php in the root of the extension:

defined('TYPO3') or die();

$GLOBALS['TYPO3_CONF_VARS']['EXT']['news']['classes']['Domain/Model/News']['eventnews'] = 'eventnews';

Domain/Model/News is the namespace to the class which should be extended and eventnews is the extension key.

Custom class

As the class Domain/Model/News should be extended, create a file at the same path in the own extension which is path/to/eventnews/Classes/Domain/Model/News.php:


namespace GeorgRinger\Eventnews\Domain\Model;

class News extends \GeorgRinger\News\Domain\Model\News
   protected string $locationSimple;

   public function getLocationSimple(): string
      return $this->locationSimple;

   public function setLocationSimple(string $locationSimple)
      $this->locationSimple = $locationSimple;

Clear system cache

Now it is time to clear the system cache, either via the dropdown in the backend or in the module Admin Tools.