Textbox accepts only positive values

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Hi
Could you please tell me how the textbox accepts only Positive numbers

I don't want to show an Error Message..

whenever we enter negative value the textbox not accepting.

How we write textBox1_KeyPress event.

Posted 11-Jan-11 14:53pm

venkatrao palepu

Updated 11-Jan-11 15:09pm

v2

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Comments

Bryian Tan 11-Jan-11 21:16pm

Hi, so do you want negative number or not?

thatraja 11-Jan-11 21:25pm

You neutral-voted my answer?, the first revision of your question is "Hi Could you please tell me how the textbox accepts only Positive numbers", you didn't said about keypress event. It's not a fair thing. You should have asked your question clearly with full details. So that we can get a clear solution for you. Please don't let down the answerers. Here many people spending their valuable time here for helping other peoples. cheers.

4 solutions

Solution 1

Google dude?

Use RegularExpressions
How To Allow Only Numbers In TextBox Control?[^]

Posted 11-Jan-11 14:59pm

thatraja

Comments

venkatrao palepu 11-Jan-11 21:07pm

Hi
it is correct.

But i am not expecting this

i don't want show an error message

whenever we are pressing negative value it's not accepting.

How we write in textBox1_KeyPress event.

Solution 5

XML

<b>Simple Way to enter only Positive Value in textbox</b>
<b>Example:</b>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Public_Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
      <title></title>
</head>
<body>
      <form id="form1" runat="server">
      <asp:ScriptManager ID="script1" runat="server">
      </asp:ScriptManager>
      <div>
            <asp:TextBox ID="txtbox1" runat="server"></asp:TextBox>
            <cc1:FilteredTextBoxExtender id="ftbe" runat="server" targetcontrolid="txtbox1"
                  filtertype="Numbers" validchars="0123456987" />
      </div>
      </form>
</body>
</html>
<b>Note:Add AjaxControlToolKit in bin directory</b>

Posted 11-Jan-11 17:36pm

Naresh26

Solution 3

More exactly (you also need to allow backspace):

XML

<html>
    <head>
        <script type="text/javascript"><!--
            function filterDigits(eventInstance) {
                eventInstance = eventInstance || window.event;
                    key = eventInstance.keyCode || eventInstance.which;
                if ((47 < key) && (key < 58) || key == 8) {
                    return true;
                } else {
                        if (eventInstance.preventDefault) 
                             eventInstance.preventDefault();
                        eventInstance.returnValue = false;
                        return false;
                    } //if
            } //filterDigits
        --></script>
    </head>
<body>
<input type="text" onkeypress="filterDigits(event)"/>
</body>
</html>

Posted 11-Jan-11 15:56pm

Sergey Alexandrovich Kryukov

v2

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Yusuf · Accepted Answer · 2011-01-11T15:15:00

Solution 2

How about using javascript code? add this js event

onkeypress=""return allowOnlyNumber(event);

then all you need is

C#

function allowOnlyNumber(evt)
{
  var charCode = (evt.which) ? evt.which : event.keyCode
  if (charCode > 31 && (charCode < 48 || charCode > 57))
    return false;
  return true;
}

Posted 11-Jan-11 15:15pm

Yusuf

Comments

venkatrao palepu 11-Jan-11 21:25pm

Thank you so much

it's too helpful for me...

Sergey Alexandrovich Kryukov 11-Jan-11 21:57pm

Yusuf, I think you forgot to allow backspace...

Yusuf 12-Jan-11 8:38am

@SAKryukov. Oops! it was from our code base. In out functionality, we did not want backspace. I should have made a note about it. Sorry!