How to show difference using javascript?

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Why NaN?
I want to show difference between 'Total' and 'Paid' amount is 'Total Due' in JavaScript. How to show?

When I calculate 'Subtotal' and 'Tax' the ans will show in 'Total' cell and, When I'm trying to show 'Total Due' from (Total-Paid) then print NaN in 'Total Due' cell in JavaScript
How to do?

What I have tried:

JavaScript :

function taxcal()
{
  var per=100;
  var subtotal=parseInt(document.getElementById('subtotal').value);
  var tax=parseInt(document.getElementById('tax').value);
  var total=parseInt(document.getElementById('total').value);
 
  if (isNaN(tax)) tax=0;

  var total1=(subtotal*(tax/per).toFixed(2));
  total=total1+subtotal;
  document.getElementById("total").innerHTML=total;
  console.log(document.getElementById('total').value);
}

function totaldue()
{
  var total=parseInt(document.getElementById('total').value);
  var paid=parseInt(document.getElementById('paid').value);
  var totaldue=parseInt(document.getElementById('totaldue').value);

  var totaldue1=Math.abs((total-paid).toFixed(2));
  document.getElementById("totaldue").innerHTML=totaldue1;
}

HTML :
<table>
.
.
.
<td valign="middle" align="center" width="100%">
        <input type="text" id="subtotal" name="subtotal" onKeyUp="result(this.form)" onKeyUp="taxcal(this.form)" class="subtotal" value="0.00" style="border:none;width: 100%;"/>
        <input type="text" id="tax" class="tax" name="tax" onKeyUp="taxcal(this.form)" onKeyUp="totaldue(this.form)" style="border:none;width: 100%;">
    </td>

    </tr>
  </table>
</div>
<br>
<div class="form-group text-center">
  <table style="float: left;margin-left: 25px;" cellpadding="1" cellspacing="1" border="1">
  <tr><td width="70%" bgcolor="#e2dad8"><label style="font-style: bold;"><font size="4px">Comment :</label></td></tr>
  <tr>
    <td><textarea rows="2" style="width: 100%;border:none;" class="form-control"></textarea></td></tr>
  </table>
 
  <table style="float: right;margin-right: 31px;" cellpadding="1" cellspacing="1" border="1" width="30%">
      <tr>
        <td width="20%" bgcolor="#e2dad8"><font size="4px">
          Total
        </td>
        <td width="10%">
          <p name="total" id="total" onKeyUp="totaldue(this.form)" readonly="readonly" value="00.00" class="text-center" style="border: none;"></p>
        </td>
      </tr>
      <tr>
        <td width="20%" bgcolor="#e2dad8"><font size="4px">Paid</td>
        <td width="10%">
          <input type="text" name="paid" onKeyUp="totaldue(this.form)" id="paid" class="text-center" style="border:none;">
        </td>
      </tr>
      <tr>
        <td width="20%"  bgcolor="#e2dad8"><font size="4px">Total Due</td>
        <td width="10%">
          <p class="text-center" id="totaldue" name="totaldue" value="0.00" onKeyUp="totaldue(this.form)" readonly="readonly" style="border:none;"></p>
        </td>
      </tr>
    </table>
</div>

Posted 24-Mar-18 0:50am

Member 10998022

Updated 28-Mar-18 2:06am

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RajuAhmed · Answer 1 · 2018-03-28T02:07:00

Hi, Here is your solution.
I analysed your code and i found a bug in your code. you just create a mistake in your "totalDue" function. and here the function code

JavaScript

function totaldue()
{
  var total=parseInt(document.getElementById('total').innerHTML);
  var paid=parseInt(document.getElementById('paid').value);
  if(isNaN(paid))
      paid=0;
  var totaldue=parseInt(document.getElementById('totaldue').innerHTML);
  
  var totaldue1=Math.abs((total-paid).toFixed(2));
  document.getElementById("totaldue").innerHTML=totaldue1;
}

And another thing i found in your code, there is no "result" function but you used in following line, which you've to remove.

HTML

<input type="text" id="subtotal" name="subtotal" onKeyUp="result(this.form)" onKeyUp="taxcal(this.form)" class="subtotal" value="0.00" style="border:none;width: 100%;"/>

and that line should be like following

HTML

<pre><input type="text" id="subtotal" name="subtotal"  onKeyUp="taxcal(this.form)" class="subtotal" value="0.00" style="border:none;width: 100%;"/>