Formatting Number in JavaScript

Question

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Javascript adding zeros to the beginning of a string (max length 4 chars)
javascript format number to have 2 digit

How can I format number to 3 digits like..

Eventually this could help ? http://stackoverflow.com/questions/4726040/javascript-adding-zeros-to-the-beginning-of-a-string-max-length-4-chars — evotopid, Dec 27 '11 at 18:49
You can apply your own logic to format the numbers you're asking. — Lion, Dec 27 '11 at 18:51

score 4 · Accepted Answer · answered Dec 27 '11 at 18:52

4

This is trivial.

var num = 9;
num = ""+num;
while(num.length < 3) num = "0"+num;

You can make this into a function easily yourself.

answered Dec 27 '11 at 18:52

Niet the Dark Absol

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score 1 · Answer 2 · answered Dec 27 '11 at 18:57

1

function pad(number, length) 
{
    var result = number.toString();
    var temp = length - result.length;

    while(temp > 0) 
    {
        result = '0' + result;
        temp--;
    }

    return result;
}

answered Dec 27 '11 at 18:57

Lion

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score 0 · Answer 3 · answered Dec 27 '11 at 18:57

Surely you need to convert those numbers in strings, because numbers datatype don't "support" initial zeros.

You can toString() the number, then check his length (NUMLENGTH), if it's less than the total number of digits you need (MAXDIGITS) then prepend MAXDIGITS-NUMLENGTH zeros to the string.

score 0 · Answer 4 · answered Dec 27 '11 at 18:58

0

http://jsfiddle.net/K3mwV/

String.prototype.repeat = function( num ) {
    return new Array( num + 1 ).join( this );
}
for (i=1;i <= 100;i++) {
    e = i+'';
    alert('0'.repeat(3 - e.length)+i);
}

answered Dec 27 '11 at 18:58

Korvin Szanto

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score 0 · Answer 5 · answered Dec 27 '11 at 18:58

function padZeros(zeros, n) {
  // convert number to string
  n = n.toString();
  // cache length
  var len = n.length;

  // if length less then required number of zeros
  if (len < zeros) {
    // Great a new Array of (zeros required - length of string + 1)
    // Then join those elements with the '0' character and add it to the string
    n = (new Array(zeros - len + 1)).join('0') + n;
  }
  return n;
}

Formatting Number in JavaScript

5 Answers5