how to check the numbers after decimal place.

Question

3.00/5 (2 votes)

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i have the text box, that accepts only numbers with decimal place. But i have to find if the user has entered the more than 2 digits after decimal point, how find the length after decimal place.

Posted 12-Dec-13 20:47pm

User-10250592

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Comments

creepz03 13-Dec-13 3:03am

I would suggest you to create a regular expression. And validate it using javascript.

6 solutions

Solution 2

Use regulation expression to validate the entry in the textbox:

^[0-9]+([.][0-9]{2})?$

Check this out to learn to use regex in c#

http://www.dotnetperls.com/regex-match[^]

Posted 12-Dec-13 21:04pm

Peter Leow

Comments

[no name] 13-Dec-13 4:27am

Nice validation :)

Peter Leow 13-Dec-13 4:57am

Thank you.

MarcusCole6833 22-Jan-16 12:21pm

works in VB as Well

Solution 1

Hello ,

you can use

Decimal.TryParse Method (String, Decimal)

to check a number is decimal or not .

Follow This Link.

thanks

Posted 12-Dec-13 20:56pm

Animesh Datta

Solution 4

use this

C#

string number = "4.555"; // Convert to string

int length = number.Substring(number.IndexOf(".")).Length;

or

visit here ...

http://forums.asp.net/t/1447499.aspx[^]

Posted 12-Dec-13 21:58pm

Rakesh Meel

Solution 6

Well, you can do like this.
First : check input value is Decimal write(there many ways to determine it)
Second: input string contains fractional part of number.
Third : the length fractional part of numberof is more than 2.

See below.

C#

string[] strSplits = textbox1.Text.Split(new char[] {'.'});
            if (strSplits.Length &amp;gt; 2)
            {
                // write your exception code
            }
            else if (String.IsNullOrEmpty(strSplits[1]))
            {
                // write your exception code
            }
            else if (strSplits[1].Length &amp;gt; 2)
            {
                // write your code
            }

Posted 12-Dec-13 22:17pm

WuRunZhe

Updated 12-Dec-13 22:18pm

v2

Solution 7

Hi
Try this code.
It will allow the user to enter decimal values with 2 number after the decimal point.

noofdecimal decides how many numbers to be typed after the decimal point. you can customize according to your need.

Code Example:

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
    <script src="jquery-1.10.2.js" type="text/javascript"></script>
    <script type="text/javascript">

        function PressfloatOnly(evt, thisobj) {

            var charCode = (evt.which) ? evt.which : event.keyCode;
            var textboxValue = thisobj.value + "";
            if (charCode == 17 || charCode == 67)
                return true;
            if (charCode == 17 || charCode == 86)
                return true;
            if (charCode == 17 || charCode == 88)
                return true;

            if (charCode == 190 || charCode == 110) {
                var contains = textboxValue.indexOf(".") != -1;
                if (contains)
                    return false;
            }

            var temp = parseFloat(textboxValue);


            temp = temp.toFixed(2);
            var noofdecimal = 2; // it decides how many number to be printed after decimal point.
            var temp1 = textboxValue.split('.');
            if (temp1.length == 2) {
                if (temp1[1].length >= noofdecimal)// it determines that after decimal user has entered values
                    return false;
            }


            if (charCode == 37 || charCode == 39) return true;  // allow arrows
            if (charCode == 46) return true; //delete
            if (charCode == 190 || charCode == 110) return true; // period or dot
            if (charCode == 35 || charCode == 36) return true; // home, end
            if (charCode == 8 || charCode == 9) return true; // backspace , tab
            if (charCode > 47 && charCode < 58) return true; //0-9  // special character keys
            if (charCode > 95 && charCode < 106) return true; //0-9 // number keys




            return false;
        }


    </script>
</head>
<body>
    <form id="form1" runat="server">
    <asp:TextBox ID="TextBox1" onKeydown="return PressfloatOnly(event,this)" runat="server"></asp:TextBox>
    </form>
</body>
</html>

Posted 12-Dec-13 22:32pm

Karthik_Mahalingam

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CPallini · Accepted Answer · 2013-12-12T21:26:00

Solution 3

Since you are sure your text box contains just numbers then you might simply use the String.Split[^] method. E.g. (error checking left to the reader)

C#

string[] a = textBox1.Text.Split(new char[] { '.' });
int decimals = a[1].Length;

Posted 12-Dec-13 21:26pm

CPallini

Comments

♥…ЯҠ…♥ 13-Dec-13 3:53am

Nice and clear... 5+

CPallini 13-Dec-13 3:55am

Thank you.