Comma-separated numbers in input in Javascript

Question

In the following process, there is no problem when the number 9999 is entered.

However, when entered as 9,999, the result is NaN.

How do I make an edit? I need to be able to use comic numbers.

I take the percentage of the number entered in input and print it to the input below.

 function yirmibes() { num1 = document.getElementById("firstNumber").value; document.getElementById("result").value = (num1 / 100) * 25; } function elli() { num1 = document.getElementById("firstNumber").value; document.getElementById("result").value = (num1 / 100) * 50; } function format(input) { var nStr = input.value + ''; nStr = nStr.replace(/\\,/g, ""); x = nStr.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'); } input.value = x1 + x2; } 

 Number: <input type="text" id="firstNumber" onkeyup="format(this)" /> <br/><br/> <input type="button" onClick="yirmibes()" Value="25%" /> <input type="button" onClick="elli()" Value="50%" /> <br/><br /> The Result is : <input type="text" id="result" Value="" /> 

Answer 1

You need to parse the input value as float if you want to accept comma-values, otherwise it will be text and you can not calculate with text-values :)

If the numbers will only be full numbers and you want to strip out a thousand seperator a parseInt should do the job, otherwise you could replace all non-number characters, or better use an input type="number" to only allow the input of numbers

parseFloat see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseFloat

input type number see: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/number

Answer 2

Comma-separated numbers is a String not a Number in Javascript.

So you can't count a String with Number , there is why you got a NaN .

There are many ways can achieve what you want, but the important thing is that don't use a String to count a Number.

In my view, you can use the replace() to remove the comma from your input value, and then use parseInt() to get an correct number. Like this :

var num1 = document.getElementById("firstNumber").value;
num1 = parseFloat(num1);

Answer 3

Remove comma when calculating result:

function yirmibes()
{
  num1 = document.getElementById("firstNumber").value.replace(',', '');
  document.getElementById("result").value = (num1 / 100) * 25;
}
function elli()
{
  num1 = document.getElementById("firstNumber").value.replace(',', '');
  document.getElementById("result").value = (num1 / 100) * 50;
}