jquery - Display results on keyup event and values inside form how to? -

how display output on keyup event rather on submit , values inside input fields?

i tried readonly <input id="result" name="totalamount" value="" readonly/>but not working. can helo?

here thew complete codes

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script> <script>     $('#myform').submit(function (event) {         event.preventdefault();          var actualprice = number($("#actualprice").val().trim());         var discount = number($("#discount").val().trim());         var shipping = number($("#shipping").val().trim());          var discountrate = (100 - discount) / 100;         var result = (actualprice * discountrate) + shipping;          $("#result").html("result :" + result.tofixed(2));     }); </script>   <form id="myform">     <input id="actualprice" type="number" placeholder="actual price">     <input id="discount" type="number" placeholder="discount">     <input id="shipping" type="number" placeholder="shipping">     <input  id="result" name="totalamount" value="" readonly/>     <h3 id="result"></h3>      <input type="submit" value="submit"> </form> 

use keyup event input , using same id result input , h3. i've changed id of h3 result2.

$('input').on('keyup input', function () {    var actualprice = number($("#actualprice").val().trim());    var discount = number($("#discount").val().trim());    var shipping = number($("#shipping").val().trim());      var discountrate = (100 - discount) / 100;    var result = (actualprice * discountrate) + shipping;        $("#result").val("result :" + result.tofixed(2));  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <form id="myform">      <input id="actualprice" type="number" placeholder="actual price">      <input id="discount" type="number" placeholder="discount">      <input id="shipping" type="number" placeholder="shipping">      <input id="result" name="totalamount" value="" readonly />      <h3 id="result2"></h3>        <input type="submit" value="submit">  </form>