Display index value number with comma

Hello, I am using Version: 2.4.0. I try to display the index value number with a comma. for example i want to dispaly my number like 12,000,000 .I have found this code but it still not working with me any idea please ?

onComplete: function () {
    var ctx = this.chart.ctx;
    ctx.font = Chart.helpers.fontString(Chart.defaults.global.defaultFontFamily, 'normal', Chart.defaults.global.defaultFontFamily);
    ctx.fillStyle = "black";
    ctx.textAlign = 'center';
    ctx.textBaseline = 'bottom';
    this.data.datasets.forEach(function (dataset) {
        for (var i = 0; i < dataset.data.length; i++) {
            for (var key in dataset._meta) {
                var model = dataset._meta[key].data[i]._model;
                var label = dataset.data[i].toFixed().replace(/./g, function (c, i, a) {
                    return i > 0 && c !== "." && (a.length - i) % 3 === 0 ? "," + c : c;
                });
                ctx.fillText(label, model.x, model.y - 3);
            }
        }
    });
}

Edit: code formatting

[simonbrunel]

@ahmedalshaikhli If I understand correctly, you want to display the value on each bar with comma in the number. You may want to check the new chartjs-plugin-datalabels (see this example) and use a custom formatter (see this fiddle).

// adapated from https://docs.galaxyproject.org/en/release_16.01/_modules/galaxy/util.html#commaify
function commaify(value) {
   var result = (''+value).replace(/^(-?\d+)(\d{3})/, '$1,$2');
   return value == result? result : commaify(result);
}

// ...

new Chart('chart', {
  type: 'bar',
  data: data,
  options: {
    plugins: {
      datalabels: {
        anchor: 'end',
        align: 'end',
        formatter: function(value) {
          return '$' + commaify(value);
        }
      }
    }
  }
});

[etimberg]

@ahmedalshaikhli you need to change the tooltip body callback

options: {
  tooltips: {
    callbacks: {
      label: function(tooltipItem, data) {
        // return custom string here
      }
    }
  }
}

Docs on the callbacks are available at http://www.chartjs.org/docs/latest/configuration/tooltip.html#tooltip-callbacks