Can't see the item in the cart?

Question

1C-Bitrix

On the site, when viewing the product in detail, there is a comparison with the basket, and if the product is already in the basket, then a message appears under the buy button, that the product is already there.

All processing goes in two files, the first and main one is result_modifier
, here is its code
$dbBasketItems = CSaleBasket::GetList(
array(
"NAME" => "ASC",
"ID" => "ASC"
),
array(
"FUSER_ID" => CSaleBasket::GetBasketUserID(),
"LID" => SITE_ID,
"PRODUCT_ID" => $arResult['ID'], //ID of the current product

),
false,
false,
array("PRODUCT_ID"
) );
while ($arItemsBasket = $dbBasketItems->Fetch()) {
$itInBasket = $arItemsBasket['PRODUCT_ID'];
}
$arResult['T1'] = $itInBasket;

And the second one in the temlate file

<?if(isset($arResult['T1'])):?> The
product is already in the cart. About
<?endif;?>

But no message is displayed. When running through the debugger, all properties even $dbBasketItems contain false and null.
Can anyone suggest what could be the problem or error?

Answer 1

Usually, components are cached . Cash is common to everyone, but the basket is individual.
Such tasks are solved using the OnEndBufferContent event.