Number Format - Thousand Separator in AS3
Here’s a short number format function I wrote to easily paste in your code when needed. It’s really handy for currency formatting.
The first parameter (number:*) can be a Number, int, uint or a String class instance.
The last parameter (siStyle:Boolean) specifies whether to use the International System of Units or not. SI units have points between the thousands and a comma for the seperator (123.456.789,01). Putting siStyle as false reverses that behaviour (123,456,789.01).
function numberFormat(number:*, maxDecimals:int = 2, forceDecimals:Boolean = false, siStyle:Boolean = true):String {
var i:int = 0, inc:Number = Math.pow(10, maxDecimals), str:String = String(Math.round(inc * Number(number))/inc);
var hasSep:Boolean = str.indexOf(".") == -1, sep:int = hasSep ? str.length : str.indexOf(".");
var ret:String = (hasSep && !forceDecimals ? "" : (siStyle ? "," : ".")) + str.substr(sep+1);
if (forceDecimals) for (var j:int = 0; j <= maxDecimals - (str.length - (hasSep ? sep-1 : sep)); j++) ret += "0";
while (i + 3 < (str.substr(0, 1) == "-" ? sep-1 : sep)) ret = (siStyle ? "." : ",") + str.substr(sep - (i += 3), 3) + ret;
return str.substr(0, sep - i) + ret;
}
Tags: AS3, currency, format, function, number, quick, separator, short, thousand
October 9th, 2009 at 3:25 pm
I like your snippet, thank you. Only thing there’s an error which leads to one decimal place less than expected.
WRONG:
for (var j:int = 0; j < maxDecimals - (str.length - sep); j++)
RIGHT:
for (var j:int = 0; j < maxDecimals - (str.length - 1 - sep); j++)
October 9th, 2009 at 6:06 pm
Aaah, you’re absolutely right! It’s fixed now.
To hold onto compactness I changed
to
Thanks for spotting that =)
October 20th, 2009 at 9:37 pm
You’ve also got the comma and decimal around the wrong way.
October 21st, 2009 at 10:11 am
No, that’s what the siStyle property is for, you can actually choose the metric SI style (default true because of majority) or non-SI style (false) that’s in use in mostly Burma (Myanmar), Liberia, and the United States.
October 31st, 2009 at 10:33 am
Thanks, I was just looking for something like this. Nice code, also.
November 20th, 2009 at 1:00 pm
I don’t see what was wrong with your original Deciaml code. When I test it your first line works - the second ads one decimal too many.
November 20th, 2009 at 1:31 pm
Torben, I found the error you were talking about; it only happened when you passed in whole numbers.
It’s been fixed now, thanks for spotting it =)
November 24th, 2009 at 11:24 am
Great, thanks Flassari
December 30th, 2009 at 4:55 pm
Hey, I added a little tweak of mine to your function. What it does is that it indents the returning string with indentUnit so that the length of the string minus decimals becomes forceLength.
This can be useful when you intend to align a vertical list of numbers so that the decimal points are in a straight line.
Note: unless you specify the forceLength parameter as a uint higher than 0, this function behaves just like the original function made by Flassari.
function numberFormat(number:*, maxDecimals:int = 2, forceDecimals:Boolean = false, siStyle:Boolean = true, forceLength:uint = 0, indentUnit:String = " "):String { var i:int = 0, inc:Number = Math.pow(10, maxDecimals), str:String = String(Math.round(inc * Number(number))/inc), indent:String = ""; var hasSep:Boolean = str.indexOf(".") == -1, sep:int = hasSep ? str.length : str.indexOf("."); var ret:String = (hasSep && !forceDecimals ? "" : (siStyle ? "," : ".")) + str.substr(sep+1); if (forceDecimals) for (var j:int = 0; j <= maxDecimals - (str.length - (hasSep ? sep-1 : sep)); j++) ret += "0"; while (i + 3 < (str.substr(0, 1) == "-" ? sep-1 : sep)) ret = (siStyle ? "." : ",") + str.substr(sep - (i += 3), 3) + ret; if(forceLength != 0) for(j = sep + i / 3; j < forceLength; j++) indent += indentUnit; return indent + str.substr(0, sep - i) + ret; }