Multiply numbers with more than 4 decimal points

Question

Possible Duplicate:
round number in JavaScript to N decimal places

This may be easy for you guys,

My question is:

How can I control a decimal places in a floating point value.

Ex.: My result is returning 0.365999999999999; but I need to show just 4 decimal numbers.

Check the demo: Demo (I accept any others ways to calculate that)

Thanks!

Entering `javascript round to 4 decimal places` in the search box on the top right of the page brought up [round number in JavaScript to N decimal places](http://stackoverflow.com/questions/2221167/round-number-in-javascript-to-n-decimal-places), among others. Please research before posting. — Frédéric Hamidi, Jun 30 '11 at 17:12

score 4 · Accepted Answer · answered Jun 30 '11 at 17:11

4

You can use .toFixed

var number = 0.365999999999999;    
var rounded = number.toFixed(4);  // 0.3660

answered Jun 30 '11 at 17:11

rosscj2533

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@ric_bfa: try 0.36544999 and see if the result suits you. – Marino Šimić Jun 30 '11 at 17:19
1

Also try `(0.9).toFixed(0)` in IE7 and [see if the result suits you](http://stackoverflow.com/questions/661562/how-to-format-a-float-in-javascript/661757#661757). – Frédéric Hamidi Jun 30 '11 at 17:28

thecodeparadox · Answer 2 · 2011-06-30T17:22:44.967

2

try this:

$("#test").keyup(function(){

   var number = parseFloat($("#number").text());
   var current = parseFloat($(this).val());

   var total = number*current;

   $("#result").val(total.toFixed(4));

});

edited Jun 30 '11 at 17:22

answered Jun 30 '11 at 17:12

thecodeparadox

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I think you need to cast to a Float first – Kevin Bowersox Jun 30 '11 at 17:14

score 1 · Answer 3 · answered Jun 30 '11 at 17:11

1

$("#result").val(total.toFixed(4));

answered Jun 30 '11 at 17:11

kei

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Chriszuma · Answer 4 · 2011-06-30T18:43:12.943

1

Javascript has a nice round function, but it only does integers so you have to multiply it by 10000 then divide the rounded result by 10000

http://www.javascriptkit.com/javatutors/round.shtml

The toFixed function always rounds up, but round will probably do what you want.

edited Jun 30 '11 at 18:43

answered Jun 30 '11 at 17:12

Chriszuma

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score 0 · Answer 5 · answered Jun 30 '11 at 17:12

0

For proper rounding:

    function roundNumber(number, digits) {
        var multiple = Math.pow(10, digits);
        var rndedNum = Math.round(number * multiple) / multiple;
        return rndedNum;
    }

For rounding up:

number.toFixed(4);

answered Jun 30 '11 at 17:12

Marino Šimić

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score 0 · Answer 6 · answered Jun 30 '11 at 17:13

0

$("#test").keyup(function(){

   var number = $("#number").text();
   var current = $(this).val();

   var total = parseFloat(number*current).toFixed(2);

   $("#result").val(total);

});

Cast the variable to a float and then use the toFixed() method

answered Jun 30 '11 at 17:13

Kevin Bowersox

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score 0 · Answer 7 · answered Jun 30 '11 at 17:16

If you follow the link below you can import the number_format php function to javascript. The function has been helping me for years now.

Here is the function signature :

function number_format (number, decimals, dec_point, thousands_sep)

http://phpjs.org/functions/number_format:481

Multiply numbers with more than 4 decimal points

7 Answers7