how do I restrict a text box from inserting only numeric values and not any thing else?

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I have 2 text boxes viz. txt_Long and txt_Lat. I want that only numeric values be able to be inserted into those text boxes and not numeric or alphanumeric values. If tried to insert any other values except numeric value, a validation violation message should be displayed in red color just under the respective text boxes.Can any one please help ?

Posted 27-Jan-14 23:13pm

Member 10520129

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Tom Marvolo Riddle 28-Jan-14 5:19am

In Asp.net or Windowforms?

Member 10520129 29-Jan-14 1:26am

asp.net

Tom Marvolo Riddle 29-Jan-14 1:30am

Please check solution2.Try it and let me know

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Praveen_P · Answer 1 · 2014-01-28T00:49:00

If you are using win forms

C#

public void txtdigitonly_KeyPress(KeyPressEventArgs e)
       {
           try
           {
               if(char.IsDigit(e.KeyChar) == true)
               {
                   e.Handled=false;
                   lblMessage.text="";
               }
               else
               {
                   e.Handled=true;
                   lblMessage.text="Please Insert Numeric Value";
               }
           }
           catch { }
       }

lblMessage is the label in which you want to display the message.

Shayan A. Khan · Answer 2 · 2014-01-29T00:57:00

using with AJAX tool:-

XML

<asp:TextBox ID="txtContactNo" runat="server" class="textfield" MaxLength="10"></asp:TextBox>
                                  <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender2" runat="server" ValidChars="0123456789"
                                      TargetControlID="txtContactNo">
                                  </cc1:FilteredTextBoxExtender>

or

using with JavaScript:-

XML

<script type="text/javascript" language="javascript">
    function isNumberKey(evt) {
        var charCode = (evt.which) ? evt.which : event.keyCode
        if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
        if (charCode == 8)
            return true;

        return true;
    }
   </script>

   <asp:TextBox ID="txtContactNo" onkeypress="return isNumberKey(event)" runat="server" class="textfield" MaxLength="10"></asp:TextBox>

TrushnaK · Answer 3 · 2014-01-29T01:46:00

Solution 8

try this js function:-

C#

// To accept only Numeric Values 
function IsNumberKeyOnly(event) {
    var e = window.event || evt; // for trans-browser compatibility
    var charCode = e.which || e.keyCode;
    if ((charCode > 31) && (charCode < 48 || charCode > 57)) {
    {
      return false;
    }
    }
    if (charCode == 8) { return true; }
    return true;
}

Posted 29-Jan-14 1:46am

TrushnaK

Comments

Tom Marvolo Riddle 30-Jan-14 0:08am

Good one +5

TrushnaK 30-Jan-14 0:09am

thanks Jas24...

Tom Marvolo Riddle 30-Jan-14 0:15am

You are most welcome!

Tom Marvolo Riddle · Answer 4 · 2014-01-27T23:25:00

Solution 2

For Asp.net use AjaxFilteredTextBoxExtender

eg:

C#

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                           
<asp:FilteredTextBoxExtender ID="FilteredTextBoxExtender3" runat="server" TargetControlID ="TextBox1" FilterType="Numbers">
</asp:FilteredTextBoxExtender>

Posted 27-Jan-14 23:25pm

Tom Marvolo Riddle

Updated 27-Jan-14 23:32pm

v3

Comments

Tom Marvolo Riddle 29-Jan-14 1:36am

This will allow only numbers in textbox

Praveen_P · Answer 5 · 2014-01-28T00:55:00

Solution 4

http://www.aspsnippets.com/Articles/Allow-only-numeric-value-numbers-in-TextBox-using-JavaScript.aspx[^]

Posted 28-Jan-14 0:55am

Praveen_P

Paw Jershauge · Answer 6 · 2014-01-27T23:19:00

Solution 1

Numeric TextBox : Allow your users to enter numeric data the easy way[^]

Posted 27-Jan-14 23:19pm

Paw Jershauge

amsath.r · Answer 7 · 2014-01-29T01:02:00

Solution 6

just validate....
use validation event for validate your box.

Posted 29-Jan-14 1:02am

amsath.r

Ahmed Jubayer · Answer 8 · 2014-01-29T01:39:00

Solution 7

You could use jQuery or simple javascript in the onkey up event.

Posted 29-Jan-14 1:39am

Ahmed Jubayer

how do I restrict a text box from inserting only numeric values and not any thing else?

8 solutions

Solution 3

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Solution 8

Solution 2

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Solution 1

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