rounding to decimal places

[simonpearce]

Hi,

I'm trying to round to decimal places - this code works on the whole but if that answer is 14.1 I want it to show as 14.10

Any ideas?

Simon

<script language="javascript"><!--

function doRound(x, places) {
return Math.round(x * Math.pow(10, places)) / Math.pow(10, places);
}

function updateGross() {
var taxRate = 17.5;
var grossValue = document.forms["FORM"].Amount.value;
var vat;

grossValue = grossValue * ((taxRate / 100) + 1);
vat = doRound(grossValue, 2) - document.forms["FORM"].Amount.value;

document.forms["FORM"].TOTAL.value = doRound(grossValue, 2);
document.forms["FORM"].VAT.value = doRound(vat, 2);
}

//--></script>

 

[trollacious]

To maintain trailing zeroes, you'll have to convert the number to a string. I use the following to format amounts into dollars and cents:

function formatdollar(oneamount)
{
if (isNaN(oneamount)) return ' ';

if ((oneamount * 1) == 0) return '0.00';

var negative = '';

if ((oneamount * 1) < 0)
  {
  negative = '-';
  oneamount += '';
  oneamount = oneamount.substr(1);
  }

var newamount=Math.round(oneamount * 100) + '';
if (newamount < 10) newamount = '0' + newamount;
newamount = newamount.substr(0, newamount.length-2) + '.' + newamount.substr(newamount.length-2);
return (negative + newamount);
}

Lee

 

[BillyRayPreachersSon]

Use "toFixed":

var myNum = 14.1;
alert(myNum.toFixed(2));

Hope this helps,
Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

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[trollacious]

I KNEW there was something out there newer than my old function, but couldn't remember the method name. #

Lee

 

[simonpearce]

Thanks folks - that great!

Simon