Save TCA changes in TYPO3 on select box - drop-down-menu

Question

I created I new field in my TCA. I want to list all articles and select one, to set the article as top-article.
The articles have a UID and the database a column called istoparticle.
tx_vendor_domain_model_article is the table with all infos of the article.
I added a TCAcolumn.
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns('tt_content', array(
'tx_test_istoparticle' => array(
'exclude' => 1,
'onChange' => 'reload',
'label' => 'Top Article',
'l10n_mode' => 'exclude',
'config' => array(
'type' => 'select',
'itemsProcFunc' => \Vendor\MyArticles\Hooks\Backend\Preview\ArticleRenderer::class . '->getArticleTitle',
)
),
));
With a userfunction
public function getTopArticles($param){
$pid = $param['row']['pid'];
$articles = $this->getArticles($pid);
foreach ($articles as $article) {
$record = BackendUtility::getRecord('tx_vendor_domain_model_article', $article->getUid());
$title = $record['header'];
$param['items'][][] = $title;
}
}
BTW:$record has all infos that I need, UID, bodytext and so on. But I can only store the header in the array!?
Now I got all the titles listed in my selectbox in the backend.
What do I have to do, to save my toparticle If I select an article in the backend?
Is there a onChange method for the TCA? And how can I get the infos like the Uid if I select one?

Answer 1

Items in TCA configuration should have at least two elements - first one is the label and second is the value. There are more options, but I think not needed in your case. You can read about them here: https://docs.typo3.org/typo3cms/TCAReference/8.7/ColumnsConfig/Type/Select.html#items
It means your usefFunc should look like that:
public function getTopArticles(&$param){
$pid = $param['row']['pid'];
$teasers = $this->getArticles($pid);
foreach ($articles as $article) {
$record = BackendUtility::getRecord('tx_vendor_domain_model_article', $article->getUid());
$param['items'][] = [
$record['header'],
$record['uid'],
]
}
}
And yes, there is onChange functionality in TCA:
https://docs.typo3.org/typo3cms/TCAReference/8.7/Columns/Index.html?highlight=onchange#onchange
If you are using older TYPO3 than 8.6 you would need to look for requestUpdate according to: https://docs.typo3.org/typo3cms/extensions/core/8.7/Changelog/8.6/Deprecation-78899-TCACtrlFieldRequestUpdateDropped.html