javascript - How to fix this calculate script which has "NaN" in cost box? -

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i have calculate script cost, have little problem when try empty price box, there "nan" in cost box.

i not know problem. have made following changes: digitsval=isnan(digitsval)?0:digitsval; became var digitsval=isnan(digitsval)?0:digitsval; , first code working, second try empty in cost box, there still "nan" in cost box.

how fix calculate script ?. there solution script?

example :

<!doctype html>  <html>  <head>  <meta charset="utf-8">  <title>berkelilingkesemua.info</title>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>  </head>    <body>    <script>  $(document).ready(function() {    var price=$('#price'),        phone=$('#phone_number'),        digits=$('#digits'),        sum=$('#sum');    function calculatesum() {      var digitsval=parseint(phone.val().substr(-2));      digitsval=isnan(digitsval)?0:digitsval;      digits.val(digitsval);      sum.val(parsefloat(price.val())+digitsval);    };    phone.on('keyup', calculatesum);    price.on('keyup', calculatesum);  });  </script>                    <table width="300px" border="1">      <tr>          <td width="40px">1</td>          <td>price</td>          <td><input class="txt" name="price" type="text" id="price"></td>      </tr>      <tr>          <td>2</td>          <td>phone number</td>          <td><input name="phone_number" type="text" id="phone_number"></td>      </tr>      <tr>          <td>3</td>          <td>2 digits</td>          <td><input class="txt" name="digits" type="text" id="digits" readonly></td>      </tr>      <tr id="summation">          <td>&nbsp;</td>          <td align="right">cost :</td>          <td align="center"><input type="text" name="sum" id="sum" value="0"></span></td>      </tr>  </table>    </body>  </html>

replace:

sum.val(parsefloat(price.val())+digitsval);

with: 

isnan(parsefloat(price.val())+digitsval) ? sum.val(0) : sum.val(parsefloat(price.val())+digitsval);

i think should work you


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