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POJquery sum and subtract based values on textbox
 

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    <p>1) I have <strong>3 text boxes</strong> if first text box is filled second is automatically updated from DB and added to fill third.</p> <p>2) however if 3rd text box is chosen then second is automatically updated from DB, subtract 3rd and second to fill 1st text box. </p> <p></p> <pre><code> &lt;td&gt;Sending Amount&lt;/td&gt; &lt;td&gt;&lt;input class="txt" type="text" name="txt" id = "sending"/&gt;&lt;/td&gt; &lt;td&gt;Charge&lt;/td&gt; &lt;td&gt;&lt;input class="txt" type="text" name="txt" id = "charge"/&gt;&lt;/td&gt; &lt;td&gt;Total Amount&lt;/td&gt; &lt;td&gt;&lt;input class="txt" type="text" name="txt" id = "totalAmount"/&gt;&lt;/td&gt; &lt;/tr&gt; </code></pre> <p> </p> <pre><code> $(function () { var sending = $('input:text[id$=sending]').keyup(foo); var charge = $('input:text[id$=charge]').keyup(foo); var totalAmount = $('input:text[id$=totalAmount]').keyup(foo); function foo() { var value1 = sending.val(); var value2 = charge.val(); var sum = add(value1, value2); $('input:text[id$=totalAmount]').val(sum); var sub = sub(value1, value2); $('input:text[id$=sending]').val(sub); } function add() { var sum = 0; for (var i = 0, j = arguments.length; i &lt; j; i++) { if (IsNumeric(arguments[i])) { sum += parseFloat(arguments[i]); } } return sum; } function sub() { var sub= 0; ***//need to create subtract function*** } return sub; } function IsNumeric(input) { return (input - 0) == input &amp;&amp; input.length &gt; 0; } }); &lt;/script&gt; </code></pre> <p><strong>addition is working fine subtraction is not displaying correct value.</strong> </p> <p>Tried below script, I think it does add and subtract .</p> <pre><code> &lt;script type="text/javascript"&gt; $(function () { var sending = $('input:text[id$=sending]').keyup(foo); var charge = $('input:text[id$=charge]').keyup(foo); var totalAmount = $('input:text[id$=totalAmount]').keyup(foo); function foo() { var value1 = sending.val(); var value2 = charge.val(); if(IsNumeric(value2)){ if(IsNumeric(value1)){ var value3 = parseFloat(value1) + parseFloat(value2); $('input:text[id$=totalAmount]').val(value3); }} value3 = totalAmount.val(); if(IsNumeric(value3)){ if(IsNumeric(value2)){ value1 = parseFloat(value3) - parseFloat(value2); $('input:text[id$=sending]').val(value1); }} } function IsNumeric(input) { return (input - 0) == input &amp;&amp; input.length &gt; 0; } }); </code></pre> <p></p>
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