Display a Value in Currency Format
By Stephen Bucaro
To display a currency value with the proper number of digits to the right of the decimal point,
first use the Math.pow function to calculate a multiplier, then use that multiplier to
round the number to the required number of digits.
Convert that value to a string so you can determine the location of the decimal point, or if
you need to add a decimal point, and if you need to add zeros to the decimal portion. Code to
convert a value to currency format is shown below.
<script>
function formatTo(value, precision)
{
// calculate multiplier required to get required number
// of digits to the right of the decimal point
var multiplier = Math.pow(10, precision);
// round value to required number of digits
var amount = Math.round(value * multiplier) / multiplier;
// convert to string
var strAmt = amount.toString();
// determine if you need to add zeros to decimal part
var decimalIndex = strAmt.indexOf(".");
if(precision > 0 && decimalIndex < 0)
{
decimalIndex = strAmt.length;
strAmt += '.';
}
// add any required zeros to decimal part
while(decimalIndex + precision + 1 > strAmt.length)
{
strAmt += '0';
}
return strAmt;
}
document.write(formatTo(4.003, 2));
</script>
Call the formatTo function, passing the value to format and the precision (number
of digits to the right of the decimal point.
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