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floating point precision in an HTML text field

Posted on 2001-09-10
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Last Modified: 2008-03-03
At this URL
http://www.cadenzasoftware.com/sample/printing/form.htm
I need the price field to always show two decimal points precision.  As it is now, two decimal points are shown only when the page loads, because I have initialized the price field to 150.00.  Play with the fields and controls and you will see that the fractional part goes away.  All of the floating point values that I use in the script have two decimal places, even 0.00.  How do I maintain two decimal places in the price field?
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Question by:myudt
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psogaa earned 400 total points
ID: 6470601
Use this function.
Then in your printing.js, replace the following line:

document.quote.price.value = price;

with:

document.quote.price.value = FormatNumber(price,2);


function FormatNumber(expr, decplaces) {
  var str = "" + Math.round(eval(expr) * Math.pow(10,decplaces));
  while (str.length <= decplaces){
    str = "0" + str;
  }
  var decpoint = str.length - decplaces;
  return str.substring(0,decpoint) + "." + str.substring(decpoint, str.length);
}
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