Javascript that calculates % of another calculation

Question

1.00/5 (2 votes)

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I have code which calculates 8% of the number entered, so for example is in the code below. If you enter "1" in the first box" and "100" in the second box the Total Refund (including 8%) = 108

JavaScript code:

JavaScript

$(document).ready(function() {
var sum = 0;
function calcSum(prevVal) {
var val1 = $('#val1').val();
var val2 = $('#val2').val();
var val3 = $('#val3').val();
var val4 = $('#val4').val();
this.sum = parseFloat(val1) * parseFloat(val2) + parseFloat(val3) * parseFloat(val4);
return this.sum;
}
var subAmt = $("#sub"),
taxAmt = $("#tax"),
totAmt = $("#total");
$(".val").each(function() {
var prevVal = this.value / 1,
self = this;
$(this).keyup(function() {
subAmt.val(calcSum.call(self, prevVal));
totAmt.val(this.sum + this.sum * parseFloat(taxAmt.val() / 100));
prevVal = self.value; 
});
});
});

http://jsfiddle.net/2k1zr59u/3/

What I would like to do is to calculate 20% of the 8% in the second to the bottom box. So in this example the answer should be 1.60.

Then I would like to show in the total box 106.40 (108 - 1.60).

Posted 11-Jun-15 2:32am

padders01

Updated 11-Jun-15 3:14am

_Asif_

v2

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Comments

ZurdoDev 11-Jun-15 8:53am

If you can do one calculation where are you stuck doing a second one?

padders01 11-Jun-15 9:12am

Not sure where to start to be honest. I've tried a few things but had no luck so far. Not an expert at this at all.

padders01 12-Jun-15 4:08am

Can anyone help me please?

1 solution

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_Asif_ · Accepted Answer · 2015-06-11T23:19:00

I have tweaked your solution a bit to make it work. But this is not an ideal way of doing things.

HTML

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
 $(document).ready(function(){
    var sum = 0;
    function calcSum(prevVal){
        
       var val1 =   $('#val1').val();
       var val2 =   $('#val2').val();
       var val3 =   $('#val3').val();
       var val4 =   $('#val4').val();

        this.sum = parseFloat(val1) * parseFloat(val2) + parseFloat(val3) * parseFloat(val4);
        return this.sum;
    }
    
    var subAmt = $("#sub");
    var taxAmt = $("#tax");
    var tmpTotalRef20=$("#totalRef20");
    var totAmt = $("#total");
    var taxAmt20 = $("#taxa");
    var costOfPremium = $("#val2");
    var totalb = $("#totalb");
    

    
    $(".val").each(function(){
        var prevVal = this.value/1, self = this;
        
        $(this).keyup(function(){
            subAmt.val(calcSum.call(self, prevVal));
            prevVal = self.value;
            var eightPercent = parseFloat(costOfPremium.val())*parseFloat(taxAmt.val()/100);
            var twentyPercent = eightPercent * parseFloat(taxAmt20.val()/100);
			      tmpTotalRef20.val(twentyPercent);	
            totAmt.val(this.sum + this.sum*parseFloat(taxAmt.val()/100));
            var finalTotal = parseFloat(totAmt.val() - twentyPercent);
            totalb.val( finalTotal);
        });
    });
});
</script>
</head>
<table>
<tr>
  <td style="text-align: left;">Number of payments to refund: </td>
  <td style="text-align: left;"><input name="Numofpayments" type="text" class="val" id="val1"/></td>
  <td></tr><p>
<tr>
  <td style="text-align: left;">Cost of premium: </td>
  <td style="text-align: left;"><input name="Premium" type="text" class="val" id="val2"></td>
  <td></tr><p>
      
<tr>
  <td style="text-align: left;">Additional number of payments to refund: </td>
  <td style="text-align: left;"><input name="Numofpayments2" type="text" class="val" id="val3" value="0"/></td>
  <td></tr><p>
<tr>
  <td style="text-align: left;">Additional cost of premium: </td>
  <td style="text-align: left;"><input name="Premium2" type="text" class="val" id="val4" value="0"/></td>
  <td></tr><p>
<tr>
  <td style="text-align: left;">Sub Total: </td>
  <td style="text-align: left;"><input name="SubTotal" type="text" id="sub" value="0" readonly/></td>
  <td></tr><p>
<tr>
  <td style="text-align: left;">Total Refund (including 8% redress) </td>
  <td style="text-align: left;"><input name="TotalRefund" type="text" id="total" value="0" readonly/></td> 
</tr><p>
<tr>
  <td style="text-align: left;">Total Refund (including 20% of the 8%) </td>
  <td style="text-align: left;"><input name="TotalRefund20" type="text" id="totalRef20" value="0" readonly/></td><p>
</tr>
    <tr>
  <td style="text-align: left;">Total </td>
  <td style="text-align: left;"><input name="Total" type="text" id="totalb" value="0" readonly/></td>
</tr>
</table>
  <input type="hidden" id="tax" value="8" readonly/>
  <input type="hidden" id="taxa" value="20" readonly/>
</html>