TestTaskAdditionalFieldProvider.php

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<?php
namespace TYPO3\CMS\Scheduler\Example;

class TestTaskAdditionalFieldProvider implements \TYPO3\CMS\Scheduler\AdditionalFieldProviderInterface {

    public function getAdditionalFields(array &$taskInfo, $task, \TYPO3\CMS\Scheduler\Controller\SchedulerModuleController $parentObject) {
        // Initialize extra field value
        if (empty($taskInfo['email'])) {
            if ($parentObject->CMD == 'add') {
                // In case of new task and if field is empty, set default email address
                $taskInfo['email'] = $GLOBALS['BE_USER']->user['email'];
            } elseif ($parentObject->CMD == 'edit') {
                // In case of edit, and editing a test task, set to internal value if not data was submitted already
                $taskInfo['email'] = $task->email;
            } else {
                // Otherwise set an empty value, as it will not be used anyway
                $taskInfo['email'] = '';
            }
        }
        // Write the code for the field
        $fieldID = 'task_email';
        $fieldCode = '<input type="text" name="tx_scheduler[email]" id="' . $fieldID . '" value="' . htmlspecialchars($taskInfo['email']) . '" size="30" />';
        $additionalFields = array();
        $additionalFields[$fieldID] = array(
            'code' => $fieldCode,
            'label' => 'LLL:EXT:scheduler/mod1/locallang.xlf:label.email',
            'cshKey' => '_MOD_system_txschedulerM1',
            'cshLabel' => $fieldID
        );
        return $additionalFields;
    }

    public function validateAdditionalFields(array &$submittedData, \TYPO3\CMS\Scheduler\Controller\SchedulerModuleController $parentObject) {
        $submittedData['email'] = trim($submittedData['email']);
        if (empty($submittedData['email'])) {
            $parentObject->addMessage($GLOBALS['LANG']->sL('LLL:EXT:scheduler/mod1/locallang.xlf:msg.noEmail'), \TYPO3\CMS\Core\Messaging\FlashMessage::ERROR);
            $result = FALSE;
        } else {
            $result = TRUE;
        }
        return $result;
    }

    public function saveAdditionalFields(array $submittedData, \TYPO3\CMS\Scheduler\Task\AbstractTask $task) {
        $task->email = $submittedData['email'];
    }

}