[javascript] add commas to a number in jQuery

I have these numbers

10999 and 8094 and 456

And all i want to do is add a comma in the right place if it needs it so it looks like this

10,999 and 8,094 and 456

These are all within a p tag like this <p class="points">10999</p> etc.

Can it be done?

I've attempted it here with the help of other posts http://jsfiddle.net/pdWTU/1/ but can't seem to get it to work

Thanks

Jamie

UPDATE

Messed around a bit and managed to figure it out here http://jsfiddle.net/W5jwY/1/

Going to look at the new Globalization plugin for a better way of doing it

Thanks

Jamie

Timothy Pirez answer was very correct but if you need to replace the numbers with commas Immediately as user types in textfield, u might want to use the Keyup function.

      $('#textfield').live('keyup', function (event) {
        var value=$('#textfield').val();

      if(event.which >= 37 && event.which <= 40){
          event.preventDefault();
      }
      var newvalue=value.replace(/,/g, '');   
      var valuewithcomma=Number(newvalue).toLocaleString('en');   
      $('#textfield').val(valuewithcomma); 

      });

    <form><input type="text" id="textfield" ></form>

Take a look at recently released Globalization plugin to jQuery by Microsoft

another approach:

function addCommas(nStr)
{
    nStr += '';
    x = nStr.split('.');
    x1 = x[0];
    x2 = x.length > 1 ? '.' + x[1] : '';
    var rgx = /(\d+)(\d{3})/;
    while (rgx.test(x1)) {
        x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    return x1 + x2;
}
var a  = addCommas(10000.00);
alert(a);

Another amazing plugin: http://www.teamdf.com/web/jquery-number-format/178/

    function delimitNumbers(str) {
      return (str + "").replace(/\b(\d+)((\.\d+)*)\b/g, function(a, b, c) {
        return (b.charAt(0) > 0 && !(c || ".").lastIndexOf(".") ? b.replace(/(\d)(?=(\d{3})+$)/g, "$1,") : b) + c;
      });
    }

    alert(delimitNumbers(1234567890));

I'm guessing that you're doing some sort of localization, so have a look at this script.

Take a look at Numeral.js. It can format numbers, currency, percentages and has support for localization.

Using toLocaleString ref at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString

function formatComma(value, sep = 0) {_x000D_
      return Number(value).toLocaleString("ja-JP", { style: "currency", currency: "JPY", minimumFractionDigits: sep });_x000D_
    }_x000D_
console.log(formatComma(123456789, 2)); // ?123,456,789.00_x000D_
console.log(formatComma(123456789, 0)); // ?123,456,789_x000D_
console.log(formatComma(1234, 0)); // ?1,234

Another way to do it:

function addCommas(n){
  var s = "",
      r;

  while (n) {
    r = n % 1000;
    s = r + s;
    n = (n - r)/1000;
    s = (n ? "," : "") + s;
  }

  return s;
}

alert(addCommas(12345678));

Number(10000).toLocaleString('en');  // "10,000"

Here is my coffeescript version of @baacke's fiddle provided in a comment to @Timothy Perez

class Helpers
    @intComma: (number) ->
        # remove any existing commas
        comma = /,/g
        val = number.toString().replace comma, ''

        # separate the decimals
        valSplit = val.split '.'

        integer = valSplit[0].toString()
        expression = /(\d+)(\d{3})/
        while expression.test(integer)
            withComma = "$1,$2"
            integer = integer.toString().replace expression, withComma

        # recombine with decimals if any
        val = integer
        if valSplit.length == 2
            val = "#{val}.#{valSplit[1]}"

        return val