Is it possible to make the value of the section in the additional field change depending on the number of elements in this section?

Question

1C-Bitrix

In general, I have a tour infoblock type, and the tour infoblock is in it, the section is the tour itself, and the elements in the section will be users, how can I make the value in the additional field about the number of visitors (elements in the section) change automatically

Answer 1

on OnAfterIBlockElementAdd and OnAfterIBlockElementUpdate for this, you can hang up a script that will update the section parameter. But in general, the section has ELEMENT_CNT