$(document) .ready(function() { $(".deviceSelect").on("change", deviceSelect); }) function deviceSelect() { var devices = $(".deviceSelect").filter(':checked'); var devices_id = $.map(devices, function(x) { return $(x).attr('data')}).join(","); if (devices_id == "") { $("#addingLotModal .text-danger").show(); $("#addingLotModal .btn-primary").hide(); } else { $("#addingLotModal .text-danger").hide(); $("#addingLotModal .btn-primary").removeClass('d-none'); $("#addingLotModal .btn-primary").show(); } $.map($(".devicesList"), function(x) { $(x).val(devices_id); }); }