Price or Amount validation by jQuery is very easy

      <div class="row">

        <div class="col-md-6 offset-md-3">

          <input type="text" class="form-control"

  placeholder="Amount in INR" 

name="amount" id="amount" 

autocomplete="off" required ">

          

        </div>

      </div>

<script>

$('#amount').keypress(function(event) { if ((event.which != 46 ||

$(this).val().indexOf('.') != -1) &&

(event.which < 48 || event.which > 57)) { event.preventDefault(); } });

</script>