Input Spninner nasıl yapılır?

HTML kodu: 

  < div class="input-group spinner" >
    < input type="text" class="form-control" value="42 ">
    < div class="input-group-btn-vertical" >
      < button class="btn btn-default" type="button">< i class="fa fa-caret-up">< /i>< /button>
      < button class="btn btn-default" type="button">< i class="fa fa-caret-down">< /i>< /button>
    < /div>
  < /div>

CSS kodu:

.spinner {
  width: 100px;
}
.spinner input {
  text-align: right;
}
.input-group-btn-vertical {
  position: relative;
  white-space: nowrap;
  width: 1%;
  vertical-align: middle;
  display: table-cell;
}
.input-group-btn-vertical > .btn {
  display: block;
  float: none;
  width: 100%;
  max-width: 100%;
  padding: 8px;
  margin-left: -1px;
  position: relative;
  border-radius: 0;
}
.input-group-btn-vertical > .btn:first-child {
  border-top-right-radius: 4px;
}
.input-group-btn-vertical > .btn:last-child {
  margin-top: -2px;
  border-bottom-right-radius: 4px;
}
.input-group-btn-vertical i{
  position: absolute;
  top: 0;
  left: 4px;
}

jQuery Kodu:

(function ($) {
  $('.spinner .btn:first-of-type').on('click', function() {
    $('.spinner input').val( parseInt($('.spinner input').val(), 10) + 1);
  });
  $('.spinner .btn:last-of-type').on('click', function() {
    $('.spinner input').val( parseInt($('.spinner input').val(), 10) - 1);
  });
})(jQuery);