Typo3: How to get the View exception error

Question

I am Developing a custom extension for Typo3. now I am getting an error if the user did not include my extension from template's include section.

I want to catch this error to show a message from controller. How can I do this?

my controller action.

 public function listAction()
 {
    $audits = $this->auditRepository->findAll();
    $this->view->assign('arrDetails', $audits);
 }

Answer 1

This could be one solution, but not the cleanest.

We first need to get the values from the field include_static_file that it is located on the sys_template table. So:

$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('sys_template')->createQueryBuilder();
$result = $queryBuilder
       ->select('include_static_file')
       ->from('sys_template')
       ->execute()
       ->fetch(0);

The we need to get the string and evaluate if your extension key is present. So:

 $extKey = 'your_extension_key';

 if (strpos($result['include_static_file'], $extKey) !== false) {
    $audits = $this->auditRepository->findAll();
    $this->view->assign('arrDetails', $audits);
 }
 else {
    $this->addFlashMessage(
            'You forgot to add the static template',
            $messageTitle = 'Template is missing',
            $severity = \TYPO3\CMS\Core\Messaging\AbstractMessage::WARNING,
            $storeInSession = TRUE
        );
 }

Your HTML

<f:if condition="{arrDetails}">
    <f:then>
        do something with your content
    </:then>
    <f:else>
           <f:flashMessages />
    </f:else>
</f:if>

Of course you can write a static function for this or you can use the LocalizationUtility in order to get the text in multiple languages. It is up to you.

Result: