Javascript decimal calculations

Question

Hello i have 3 values in this format 1000, 2000, 200. Iam using this function to convert them in the format below

 function formatNumber(number)
    {
        number = number.toFixed(2) + '';
        x = number.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;
    }

1.000,00 2.000,00 and 200,00

How can i calculate them so the result will be 3.200,00 ?

Iam calculating them in each statement beacuase more fields can be generated in my applications.

Thanks. Any help will be appreciated.

So I'm not so sure about your question, but why not adding all the values so then format the result? — Gerardo Charles Rojas Vega, Jan 13 '15 at 01:28
The duplicate uses commas for thousands separators, just change the characters for this question. — RobG, Jan 13 '15 at 01:57

score 1 · Answer 1 · answered Jan 13 '15 at 01:45

Here's a function I adapted from another StackOverflow post a while ago. See the links in the source for more details.

/* 
http://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-money-in-javascript
decimal_sep: character used as deciaml separtor, it defaults to '.' when omitted
thousands_sep: char used as thousands separator, it defaults to ',' when omitted
*/
Number.prototype.toMoney = function(decimals, decimal_sep, thousands_sep) { 
   var n = this,
   c = isNaN(decimals) ? 2 : Math.abs(decimals), //if decimal is zero we must take it, it means user does not want to show any decimal
   d = decimal_sep || '.', //if no decimal separator is passed we use the dot as default decimal separator (we MUST use a decimal separator)

   /*
   according to [http://stackoverflow.com/questions/411352/how-best-to-determine-if-an-argument-is-not-sent-to-the-javascript-function]
   the fastest way to check for not defined parameter is to use typeof value === 'undefined' 
   rather than doing value === undefined.
   */   
   t = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep, //if you don't want to use a thousands separator you can pass empty string as thousands_sep value

   sign = (n < 0) ? '-' : '',

   //extracting the absolute value of the integer part of the number and converting to string
   i = parseInt(n = Math.abs(n).toFixed(c)) + '', 

   j = ((j = i.length) > 3) ? j % 3 : 0; 
   return sign + (j ? i.substr(0, j) + t : '') + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : ''); 
}

You can use it like this

var num = 1000 + 2000 + 200;
num.toMoney(2, ',', '.'); // => 3.200,00

Yeah i got it now. Is there any chance to unformatNumber 1.000,00 to the first value 1000 with similar functions ? — mstojanov, Jan 13 '15 at 01:56

Javascript decimal calculations

1 Answers1