const loading = `<div class="spinner spinner-border text-white" role="status">
                <span class="sr-only">Loading...</span>
            </div> Loading`

beforeSend: function () {
    $("#btn-submit").html(loading);
    $("#btn-submit").attr('disabled', true);
},
success: function (response) {
  $("#btn-submit").removeAttr('disabled');
  $("#btn-submit").html("Proses");
}