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Adds zeros on the left or right of a number.
Created: 2005.10.02 - Modified 2005.11.01

//+ Carlos R. L. Rodrigues
//@ http://jsfromhell.com/number/zero-format [rev. #1]

Number.prototype.zeroFormat = function(n, f, r){
    return n = new Array((++n, f ? (f = (this + "").length) < n ? n - f : 0 : n)).join(0), r ? this + n : n + this;
};

<script type="text/javascript">
//<![CDATA[

var n = 123;
document.write(
    "<h2>N = ", n, "</h2>",
    "N.zeroFormat(5, true, true) = ", n.zeroFormat(5, true, true), "<br />",
    "N.zeroFormat(5, true) = ", n.zeroFormat(5, true), "<br />",
    "N.zeroFormat(5) = ", n.zeroFormat(5)
);

//]]>
</script>

Number.zeroFormat(n: Integer, [fill: Boolean = false], [right: Boolean = false]): String

Returns the number converted to string with zeroes on the left or right.

n

amount of zeroes to be added

fill

if "true", the zeroes will be added to the number until reaching at least "n" digits, otherwise it will be added exactly "n" zeroes

right

if "true" the zeroes will be concatenated on the right, otherwise on the left

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