itemsProcFunc

itemsProcFunc
Type:string (class->method reference)
Scope:Display / Proc.
Types:check, flex, radio

PHP function which is called to fill / manipulate the array with elements.

[classname]->[methodname]

The function/method will have an array of parameters passed to it, the items-array is passed by reference in the key ‘items’. By modifying the array of items, you alter the list of items. A method may throw an exception which will be displayed as a proper error message to the user.

Example:

The configuration for the field category_field of the table tt_content looks like this:

'type' => 'select',
'renderType' => 'selectSingle',
'itemsProcFunc' => 'TYPO3\CMS\Core\Category\CategoryRegistry->getCategoryFieldsForTable',
'itemsProcConfig' => [
   'table' => 'tt_content'
],
'minitems' => 0,
'maxitems' => 1,
'size' => 1

The referenced itemsProcFunc should populate the items by filling $configuration['items']`:

/**
 * Returns a list of category fields for a given table for populating selector "category_field"
 * in tt_content table (called as itemsProcFunc).
 *
 * @param array $configuration Current field configuration
 * @throws \UnexpectedValueException
 * @internal
 */
public function getCategoryFieldsForTable(array &$configuration)
{
   $table = $configuration['config']['itemsProcConfig']['table'] ?? '';
   // Return early if no table is defined
   if (empty($table)) {
      throw new \UnexpectedValueException('No table is given.', 1381823570);
   }
   // Loop on all registries and find entries for the correct table
   foreach ($this->registry as $tableName => $fields) {
      if ($tableName === $table) {
         foreach ($fields as $fieldName => $options) {
            $fieldLabel = $this->getLanguageService()->sL($GLOBALS['TCA'][$tableName]['columns'][$fieldName]['label']);
            $configuration['items'][] = [$fieldLabel, $fieldName];
         }
      }
   }
}

Further examples on different config type’s can be found in the extension styleguide.