I have this form:
Old post, but just in case, use the event action of any items integrated to a repeater :
export function whateverElement_onClick(event) { let $item = $w.at(event.context) const data = $w("#repeater2").data; let clickedItemData = data.find(item => item._id === event.context.itemId); //console.log(clickedItemData._id) == "MY165ID" }