jquery - result not getting in to the field -

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here have 3 fields , while adding values in 2 fields sum of value should enter in third field here sum function not getting here code

<script type="text/javascript">    $(document).ready(function () {      var balanceamount = $("#balance").val();     var actual_amount = $("#total_amount").val();     var total_balance = $("#totalbalance").val();        $("#amount").keyup(function ()        {          var amount = $("#amount").val();          var total_balance = $("#totalbalance").val();          var total_amount = total_balance + amount;          alert(total_amount);          $("#total_amount").val(total_amount.tofixed(2));      });   }); </script>

you need parsefloat() values...

<script type="text/javascript">     $(document).ready(function () {          var balanceamount = parsefloat( $("#balance").val() );         var actual_amount = parsefloat( $("#total_amount").val() );         var total_balance = parsefloat( $("#totalbalance").val() );          $("#amount").keyup(function ()         {             var amount = parsefloat( $("#amount").val() );             var total_balance = parsefloat( $("#totalbalance").val() );             var total_amount = total_balance + amount;             alert(total_amount);             $("#total_amount").val(total_amount.tofixed(2));          });     }); </script>

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