Here is my code that does not work: $w.onReady(function () { $w('#TeamAppdata').onReady(() => { $w('#repeater1').onItemReady(($item, itemData) => { $item("#checkSelect").onChange((event) => { }); if ($item('#checkSelect').checked) { $item('#btnAddToTeam').show(); } else { $item('#btnAddToTeam').hide(); } }); }); });