I would format a number with 2 decimal places without rounding. So I excluded the toFixed() function.

I have tried this way

a = 1,809999
b = 27,94989

a = Math.floor(a * 100) / 100; --> 1,8
b = Math.floor(b * 100) / 100; --> 27,94

OR

a = Number(a.toString().match(/^\d+(?:\.\d{0,2})?/)); --> 1,8
b = Number(b.toString().match(/^\d+(?:\.\d{0,2})?/)); --> 27,94

Unfortunately, the second decimal of a is zero, and this was deleted, how could I do to keep it and have a = 1.80? Thank you

I would format a number with 2 decimal places without rounding. So I excluded the toFixed() function.

I have tried this way

a = 1,809999
b = 27,94989

a = Math.floor(a * 100) / 100; --> 1,8
b = Math.floor(b * 100) / 100; --> 27,94

OR

a = Number(a.toString().match(/^\d+(?:\.\d{0,2})?/)); --> 1,8
b = Number(b.toString().match(/^\d+(?:\.\d{0,2})?/)); --> 27,94

Unfortunately, the second decimal of a is zero, and this was deleted, how could I do to keep it and have a = 1.80? Thank you

• javascript
• jquery

• You're confusing rounding with formatting. – Dave Newton Commented Apr 29, 2015 at 10:39
• try using this: a.toFixed(2) // this fixes to two decimal places – Kop4lyf Commented Apr 29, 2015 at 10:40
• possible duplicate of JavaScript: formatting number with exactly two decimals – GillesC Commented Apr 29, 2015 at 10:47

5 Answers 5

(Math.floor(a * 100) / 100).toFixed(2);

With toFixed(2) !

JSFIDDLE DEMO

You can try like this:

a= a.toString().slice(0, (a.indexOf("."))+3); 

JSFIDDLE DEMO

Rounding a number is about changing it's value, and should be done with math operations (Math.floor, Math.ceil, Math.round, ...).

Formatting number, is about how do numbers get displayed to a human user (like Date formatting).

Javascript does not es with acceptable native tool to do number formatting.

You can always play with rounding to make javascript print a number the way you want, but you will end up writing a lot of (possibly buggy) code.

I would remend using a library to format your numbers http://numeraljs./

numeral(number).format('0.00');

only need to use toFixed() and pass number like 2 then it show after . two decimal like bello

a = 1,809999
b = 27,94989

a = Math.floor(a * 100) / 100; 
b = Math.floor(b * 100) / 100; 

$(".testa").text(a.toFixed(2)); //see here.
$(".testb").text(b.toFixed(2)); //see here.

Html :

<div class="testa"></div>
<br>
    <div class="testb"></div>

i hope this will help you. and also see this jsfiddle link http://jsfiddle/RGerb/394/

myFunction(value: number){
let x = value + ''; 
  var a =  x.lastIndexOf('.')>=0?parseFloat(x.substr(0,x.lastIndexOf('.')+(3))):value;
  var am = a.toFixed(2)
  console.log("Output: " + am);
  return am;

}

<button (click)="myFunction(656565.9668985)">My Function</button>

Output: 656565.96