Render function to numeric column type for datatables.net - Parameters: "," decimal separator and "." thousand separator.

datatable-render-customNumberFormat.js

// usage

$("#dataTable").DataTable(
{
    "columns": [
        {
            "data": "precio",
            "name": "Precio",
            "render": $.fn.dataTable.render.customNumberFormat('.', ',', 6)
        }
    ]
});


// define format
$.fn.dataTable.render.customNumberFormat = function (thousands, decimal, precision, prefix, postfix) 
{
    return function(d) 
    {
        if (typeof d !== 'number' && typeof d !== 'string') 
        {
            return d;
        }
 
        var negative = d < 0 ? '-' : '';
        var flo = parseFloat(d);
 
        // If NaN then there isn't much formatting that we can do - just
        // return immediately, escaping any HTML (this was supposed to
        // be a number after all)
        if (isNaN(flo)) 
        {
            return __htmlEscapeEntities(d);
        }
 
        flo = flo.toFixed(precision);
        d = Math.abs(flo);
 
        var intPart = parseInt(d, 10);
        var floatPart = precision ?
            decimal + Number((d - intPart).toFixed(precision)).toString().substring(2) :
            '';
 
        return negative + (prefix || '') +
            intPart.toString().replace(
                /\B(?=(\d{3})+(?!\d))/g, thousands
            ) +
            floatPart +
            (postfix || '');
    }
}