Formatar String, Casas Decimais

Brother, achei em : http://www.js-x.com/...ript/?viewh=965 a sua solução...

<html>
<head>


<script>
/*function : format_number()
version: 1.0.0
This function formats a numeric value passed in to it with specified number of
decimal values. numeric value will not be rounded.
pnumber : numeric value to be formatted.
decimals : number of decimal points desired.

Author: Buddhike de Silva
Date: 21-Nov-2002 11:16 AM*/

/*
revision: 1.1.0
Author: M. Cassim Farook
Date: 21-Nov-2002 10:16 PM
Notes: No offense buddhike...but i had to rewrite the code
works for ADT (any dam thing)
usage: x = format_number(123.999, 2)
*/

/*
revision: 1.2.0
Authors: Buddhike de Silva
Date: 22-Nov-2002 12:07 PM
Notes: Optimized for best performence.
usage: x = format_number(123.999, 2)
*/

/*
* Revision: 1.3
* Author: Mike Robb (JS-X.com)
* Date: May 26, 2003
* Notes: Changed to deal with negative numbers.
* Fixed length of final answer.
* Work-around for javascript internal math problem with rounding negative numbers.
*/

/*
* Revision 1.4
* Author: LeAnn Roberts
* Date: September, 2003
* Note: Modified the if logic: Math.pow()
*/

/*
* Revision 1.5
* Author: Robert Heggdal
* Date: February, 2004
* Note: Modified check for negative number by replacing parseInt with parseFloat so that negative numbers between zero and minus one are recognized as such.
*/

/*
* Revision 1.6
* Author: Naveen
* Date: February, 2004
* Note: Rewrote format_number to correct a logic problem.
*/

/*
* Revision 1.7
* Author: JS-X.com
* Date: February, 2004
* Note: Added wrapper around format_number as negative values were dropped from
* the logic.
*/

function format_number(p,d)
{
var r;
if(p<0){p=-p;r=format_number2(p,d);r="-"+r;}
else {r=format_number2(p,d);}
return r;
}
function format_number2(pnumber,decimals)
{
var strNumber = new String(pnumber);
var arrParts = strNumber.split('.');
var intWholePart = parseInt(arrParts[0],10);
var strResult = '';
if (isNaN(intWholePart))
intWholePart = '0';
if(arrParts.length > 1)
{
var decDecimalPart = new String(arrParts[1]);
var i = 0;
var intZeroCount = 0;
while ( i < String(arrParts[1]).length )
{
if( parseInt(String(arrParts[1]).charAt(i),10) == 0 )
{
intZeroCount += 1;
i += 1;
}
else
break;
}
decDecimalPart = parseInt(decDecimalPart,10)/Math.pow(10,parseInt(decDecimalPart.length-decimals-1));
Math.round(decDecimalPart);
decDecimalPart = parseInt(decDecimalPart)/10;
decDecimalPart = Math.round(decDecimalPart);

//If the number was rounded up from 9 to 10, and it was for 1 'decimal'
//then we need to add 1 to the 'intWholePart' and set the decDecimalPart to 0.

if(decDecimalPart==Math.pow(10, parseInt(decimals)))
{
intWholePart+=1;
decDecimalPart="0";
}
var stringOfZeros = new String('');
i=0;
if( decDecimalPart > 0 )
{
while( i < intZeroCount)
{
stringOfZeros += '0';
i += 1;
}
}
decDecimalPart = String(intWholePart) + "." + stringOfZeros + String(decDecimalPart);
var dot = decDecimalPart.indexOf('.');
if(dot == -1)
{
decDecimalPart += '.';
dot = decDecimalPart.indexOf('.');
}
var l=parseInt(dot)+parseInt(decimals);
while(decDecimalPart.length <= l)
{
decDecimalPart += '0';
}
strResult = decDecimalPart;
}
else
{
var dot;
var decDecimalPart = new String(intWholePart);

decDecimalPart += '.';
dot = decDecimalPart.indexOf('.');
var l=parseInt(dot)+parseInt(decimals);
while(decDecimalPart.length <= l)
{
decDecimalPart += '0';
}
strResult = decDecimalPart;
}
return strResult;
}

</script>

</head>
<body>

<form name=f0 onsubmit="document.f0.r1.value=format_number(document.f0.t1.value,document.f0.t2.value);return false;">
Number<input type=text name=t1 value="0.9666666666666667"><BR>
Percision<input type=text name=t2 value="1"><BR>
<input type=submit value="Format Number"><BR>
Result <input type=text name=r1 value="?">
</form>
<BR>
<form name=f1 onsubmit="document.f1.r1.value=format_number(document.f1.t1.value,document.f1.t2.value);return false;">
Number<input type=text name=t1 value="123.546789"><BR>
Percision<input type=text name=t2 value="3"><BR>
<input type=submit value="Format Number"><BR>
Result <input type=text name=r1 value="?">
</form>
<BR>
This will divide num1 / num2 then compute
<form name=f2 onsubmit="document.f2.r1.value=format_number(document.f2.t1.value/document.f2.t2.value,document.f2.t3.value);return false;">
Number1<input type=text name=t1 value="22"><BR>
Number2<input type=text name=t2 value="7"><BR>
Percision<input type=text name=t3 size=30 value="15"><BR>
<input type=submit value="Format Number"><BR>
Result <input type=text name=r1 value="?">
</form>

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</body>
</html>

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