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I am trying to implement a thousand separator while typing in MVC 6 razor page, the code below seems to work but it shows NAN if the number is deleted completely and also shows INFINITY if a large set of numbers are also entered into the textbox, lastly, it only separates the thousand part, it doesn't add the dot and the hundredth part to it, e.g: 10000 = 10, 000, but I want it to be like this: 10000 = 10, 000.00. I appreciate any assistance.

What I have tried:

$(function () {
            $("#TransAmount").on('keyup', function () {
                $(this).val(numberWithCommas(parseFloat($(this).val().replace(/,/g, ""))));
        function numberWithCommas(x) {
            return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
Updated 30-Jun-23 23:12pm

1 solution

One of the ways could be to:
1. separate the decimal part
2. regex the integer part
3. put decimal and integer parts back together

Have a look at few examples here:
Reference 1 (Javascript based): JavaScript Number Format - Add Commas -[^]

Example 1:
function addCommas(nStr)
	nStr += '';
	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');
	return x1 + x2;
// 1,000

// 1,231.897243

// 9,999,999.00

// -500,000.99

In case you are looking more locale/region specific, then you can simply use: toLocaleString()
Reference 2: Number.prototype.toLocaleString() - JavaScript | MDN[^]

$(".Comma").each(function(){ // To loop on each value
  var amount = parseFloat($(this).html()); // Convert string into float number
  var newamount = amount.toLocaleString('en-US'); // add comma
  $(this).html(newamount); // replace old number with new number

Reference 3: Use a jQuery plugin: Auto Add Thousand Separators In Numbers - Easy Number Separator | Free jQuery Plugins[^]
<script src="easy-number-separator.js"></script>
<input type="text" class="number-separator" placeholder="Enter Your Number Here...">

For handling NaN, you need to first check if it's a valid value to convert to a float or not.
You can make use of isNaN()[^] and accordingly handle the desired value.

For handling Infinity, you need to be within the limits datatype supports.
Infinity values are returned when the number is outside the double-precision 64-bit IEEE 754-2019 format range

Reference: parseFloat() - JavaScript | MDN[^]

One possible way to handle very large value is to find alternate datatype like bigint[^] or so. Nothing standard that I know of.

Try and adjust to you need.
Share this answer
Graeme_Grant 1-Jul-23 0:49am    
In some cultures, the decimal and comma are swapped
Sandeep Mewara 1-Jul-23 0:52am    
Yeah and if that is a need, hoping that Reference 2 would help. :)
Graeme_Grant 1-Jul-23 0:56am    
Also check out Japanese numbers ... separator is at 4 places, not 3.
Uwakpeter 1-Jul-23 5:45am    
Thanks, @SandeepMewara. This works for me, only that it doesn't accept decimal points, I want the numbers to be in two places of decimal.
Sandeep Mewara 1-Jul-23 7:47am    
Glad to know it worked for you.

You can again have custom logic to floor the number to 2 digits before merging back. It's in your control if you want to limit to two places only.

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