For Developers

How it works

This extension Xclasses the PageLayoutController of the TYPO3 core. The class is inherited and the method getHeaderFlashMessagesForCurrentPid() overriden.

All functions which use the hook are called and the additional messages rendered.

How to use the hook

Simple example:

ext_localconf.php:

// ...
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['Sypets/PageCallouts/Xclass/PageLayoutControllerWithMessages']['addFlashMessageToPageModule'][] =
    \Myvendor\MyExtension\Hooks\PageCalloutsHook::class;

ClassesHooksPageCalloutsHook.php:

<?php
declare(strict_types=1);
namespace Myvendor\MyExtension\Hooks;

use TYPO3\CMS\Core\Localization\LanguageService;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Fluid\ViewHelpers\Be\InfoboxViewHelper;

final class PageCalloutsHook
{
    public function addMessages(array $pageInfo): array
    {
        $pageId = (int) ($pageInfo['uid']);
        $doktype = (int) ($pageInfo['doktype'] ?? 0);

        if ($someCondition) {
            $title = 'Some title';
            $message = 'some message';
            return [
                'title' => $title,
                'message' => $message,
                'state' => InfoboxViewHelper::STATE_ERROR
            ];
        }
        return [];
    }
}