Thousand seperator issue in C# HTML

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I am trying to separate integer with commas in while entering the numbers in the textbox and i am trying to show commas only in the front end .

so when i go upto 9999 it gives correct output like 9,999 and when i type 10000 it gives output as 1,0,000

pls guide me

What I have tried:

this is my code 

    <pre><script type="text/javascript">

        function addCommas(nStr) {
            nStr += '';
            x = nStr.split('.');
            x1 = x[0];
            x2 = x.length > 1 ? '.' + x[1] : '';
            var rgx = /(^\d{2})|(\d{1,3})(?=\d{1,3}|$)/g;
            while (rgx.test(x1)) {
                x1 = x1.replace(rgx, '$1' + ',' + '$2');
            }
            return x1 + x2;
        }


    </script>

and this my html code line

<asp:TextBox ID="txtbudamt" runat="server" CssClass="text_box" Height="22px" Width="140px" onkeyup="this.value=addCommas(this.value);"
                                                                            onkeydown="return (event.keyCode!=13);" AutoComplete="Off" TabIndex="7"></asp:TextBox>

Posted 28-Sep-20 19:31pm

Member 13998042

Updated 28-Sep-20 20:55pm

v2

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OriginalGriff · Answer 1 · 2020-09-28T20:18:00

Solution 1

See here: Number formatting in JavaScript - Tom's Blog[^]

But in future, please tag your questions correctly - this is not a C# problem, it's a javascript problem. Getting the tag wrong as you have means that people who know javascript but not C# will ignore your question and that can delay or prevent you getting a solution.

Posted 28-Sep-20 20:18pm

OriginalGriff

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Member 13998042 29-Sep-20 2:29am

thanks i will change it

Patrice T · Answer 2 · 2020-09-28T20:56:00

Using Regex for formatting an integer is a little bit over engineered.
If you don't want to use native JS formatting feature, you can program it.
Algorithm:

JavaScript

function addCommas(nStr) {
  result= ""
  while (nStr.length > 3) {
    tail= the last 3 digits of nStr
    result= ","+ tail + result
    nstr= the first (length-3) digits of nstr
  }
  result= nstr + result
}

I let you search exact functions as exercise.