Parsing numbers with a comma decimal separator in JavaScript

Question

I used this function to check if a value is a number:

function isNumber(n) {     return !isNaN(parseFloat(n)) && isFinite(n); } 

My program need to work with German values. We use a comma as the decimal separator instead of a dot, so this function doesn't work.

I tried to do this:

n.replace(",",".") 

But it also doesn't seem to work. The exact function I tried to use is:

function isNumber(n) {     n=n.replace(",",".");     return !isNaN(parseFloat(n)) && isFinite(n); } 

The number looks like this 9.000,28 instead of the usual 9,000.28 if my statement wasn't clear enough.

Answer 1

You need to replace (remove) the dots first in the thousands separator, then take care of the decimal:

function isNumber(n) {     'use strict';     n = n.replace(/\./g, '').replace(',', '.');     return !isNaN(parseFloat(n)) && isFinite(n); } 

Answer 2

var number = parseFloat(obj.value.replace(",","")); 

You'll probably also want this to go the other way...

obj.value = number.toLocaleString('en-US', {minimumFractionDigits: 2});