How to produce sum of a text box value with previous value

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var amount = $("#txtAmnt").val();
$("#txtGrossAmnt").val(amount);
when value of txtAmnt changed to another value how can we produce new txtGrossAmnt as the sum of old txtGrossAmnt value and new txtGrossAmnt value

Posted 28-Mar-14 21:02pm

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Sandeep Singh Shekhawat · Answer 1 · 2014-03-28T21:12:00

HTML

<div>
       <input id="txtAmnt" type="text" />
       <input id ="txtGrossAmnt" type="text" />

   </div>

JavaScript

$("#txtAmnt").focusout(function ()
     {
         var amount = $("#txtAmnt").val();
         var grossAmount = $("#txtGrossAmnt").val();
         alert(grossAmount);
         if (grossAmount == '')
         {
             grossAmount = 0.0;
         }
         $("#txtGrossAmnt").val(parseFloat(grossAmount) + parseFloat(amount));
     })