Text box should only accept only numbers and dot

Question

1.28/5 (4 votes)

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C#

ASP.NET

I only need to type numbers and one dot(.) in my text box. How can i validate it using code. Not by asp controls.

Posted 16-Apr-12 19:24pm

codeBegin

Updated 21-Feb-19 20:55pm

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Comments

Philippe Mori 16-Nov-16 9:18am

And you have to consider that in some language, a comma is used as the decimal separator...

10 solutions

Solution 5

You can use Regular Expressions[^] to validate a textbox through Javascript[^]. You can use this site[^] to test your Regex patterns.

Posted 16-Apr-12 19:30pm

walterhevedeich

Solution 17

Text box accept only numbers instead of letters or special characters

<input type="text" name="search" id="txtSearch" class=" search-query form-control" placeholder="Search by Id" onkeypress="return event.charCode >= 48 && event.charCode <= 57" onpast="return false" />

Posted 25-Feb-18 22:50pm

Member 13366973

Updated 25-Feb-18 22:54pm

v2

Comments

CHill60 26-Feb-18 7:52am

The question was asked and answered nearly 6 years ago! Stick to answering new questions where the OP still needs help. Also make sure you have read, understood and are answering, the question that was asked. This code will not allow any decimal points never mind ensuring only one is entered

Solution 1

u can do that using javascript fuction .make a java script function in head tag and call that function in textbox change event or or set the autopostback propertie to true of textbox.

Posted 16-Apr-12 19:27pm

Yatin_Chauhan

Solution 13

validateInt() allows only the integer values to the textbox.

C#

//Function to allow only Integer values to textbox
        function validateInt(key) {
            //getting key code of pressed key
            var keycode = (key.which) ? key.which : key.keyCode;
            //comparing pressed keycodes
            if ((keycode != 8) && (keycode < 48 || keycode > 57)) {
                return false;
            }
            else {
                return true;
            }
}

validateDec() allows Decimal values and it allows only one decimal point.

C#

//Function to allow only Decimal values to textbox
function validateDec(key) {
            //getting key code of pressed key
            var keycode = (key.which) ? key.which : key.keyCode;
            //comparing pressed keycodes
            if (!(keycode == 8 || keycode == 46) && (keycode < 48 || keycode > 57)) {
                return false;
            }
            else {
        var parts = key.srcElement.value.split('.');
                if (parts.length > 1 && keycode == 46)
                    return false;
                return true;
            }
}

And call the above required method from your textbox keypress event like below.

C#

<asp:TextBox ID="txtDays" runat="server" onkeypress="return validateInt(event)" />


<asp:TextBox ID="txtCost" runat="server" onkeypress="return validateDec(event)" />

Posted 9-Jul-14 19:59pm

Banuchandar Nagarajan

Updated 9-Jul-14 20:02pm

v2

Solution 6

You can do it using jquery or native javascript.

Try these:

Text box to accept only number[^]

Restricting input to textbox: allowing only numbers and decimal point[^]

hope it helps :)

Posted 16-Apr-12 19:32pm

Uday P.Singh

Solution 11

There is a way suggested as 'best practice' and that is using regex validation...
Read here - with samples - http://msdn.microsoft.com/en-us/library/ff650303.aspx[^]

Posted 21-May-14 3:52am

Kornfeld Eliyahu Peter

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gqadirshabbir · Accepted Answer · 2012-04-16T19:33:00

For the server side you can use this way....

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar) 
        && !char.IsDigit(e.KeyChar) 
        && e.KeyChar != '.')
    {
        e.Handled = true;
    }

    // only allow one decimal point
    if (e.KeyChar == '.' 
        && (sender as TextBox).Text.IndexOf('.') > -1)
    {
        e.Handled = true;
    }
}

You can use this javascript function for the client side validation.

HTML

<html>
  <head>
    <script language="Javascript">
       <!--
       function isNumberKey(evt)
       {
          var charCode = (evt.which) ? evt.which : event.keyCode
          if (charCode != 46 && charCode > 31 
            && (charCode < 48 || charCode > 57))
             return false;

          return true;
       }
       //-->
    </script>
  </head>
  <body>
    <input id="txtChar"  önkeypress="return isNumberKey(event)">
           type="text" name="txtChar">
  </input></body>
</html>

P.Salini · Accepted Answer · 2012-04-16T19:29:00

Solution 4

refer this

type only numbers and dot in textbox[^]

Posted 16-Apr-12 19:29pm

P.Salini

Prasad_Kulkarni · Accepted Answer · 2012-04-16T19:29:00

Solution 2

Try this:

C#

void NumberValidation(object sender, KeyPressEventArgs e)
        {
            if ((e.KeyChar >= 48 && e.KeyChar <= 57) || e.KeyChar == 46)
            {
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
            }
        }

Posted 16-Apr-12 19:29pm

Prasad_Kulkarni

Comments

Jai panchal 17-Feb-18 3:05am

whats the namespace for this " keyevent args " ??

sravani.v · Accepted Answer · 2012-04-16T19:29:00

Solution 3

Refer this link:

http://stackoverflow.com/questions/5761965/how-to-restrict-the-textbox-to-accept-only-one-dot-in-decimal-number-in-keypress[^]

Posted 16-Apr-12 19:29pm

sravani.v

Text box should only accept only numbers and dot

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