Add leading zeros to a number in Javascript

Posted on June 16, 2010, 8:22 am, by Brian, under Working on the web.

Needed a quick way to add leading zeros to numbers for a js countdown script. Not hard to do, now I can look at this post for the code when I need it again.

function addLeadingZeros(n, totalDigits)
	{
	    if(!totalDigits)totalDigits = 2;
	    n = String(n);
	    while (n.length < totalDigits)
		n = "0"+n;
	    return n;
	}
 
var num = 5;
 
num = addLeadingZeros(num, 3);
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