restrict text box in asp.net and c#

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hi
I have a question about textbox.
I want restrict users for enter data in to the textbox payattention 2 roles:

1- thay can only enter numbers not others type

2- thay can't enter numbers more than 5 number

what do i do?

thanks

Posted 26-Jul-12 23:31pm

veusk

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Prasad_Kulkarni · Answer 1 · 2012-07-26T23:54:00

Try this:
thay can only enter numbers not others type
Try this:

C#

void NumberValidation(object sender, KeyPressEventArgs e)
      {
          if ((e.KeyChar >= 48 && e.KeyChar <= 57) || e.KeyChar == 8)
          {
              e.Handled = false;
          }
          else
          {
              e.Handled = true;
          }
      }

thay can't enter numbers more than 5 number
JavaScript:

XML

<script type="text/javascript">
   function numbersonly()
   {
   var data=document.getElementById('<%=TextBox1.ClientID %>').value;
   var filter=/^[a-zA-Z0-9]+$/;
    if(!filter.test(data))
       {
       alert("Please enter alphanumeric only");
       document.getElementById('<%=TextBox1.ClientID %>').value="";
       document.getElementById('<%=TextBox1.ClientID %>').focus();
       return false;
       }
       else if(data.Length!=5)
       {
       alert("Please enter 5 digits");
       return false;
       }
       else
       return true;
   }
   </script>

Using JavaScript:

XML

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
   <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="javascript:return numbersonly();"/>

MAU787 · Answer 2 · 2012-07-26T23:36:00

hi for 1st do this

XML

<html>
<head>

    <script language="javascript">
        function blockChar() {
            var str = document.getElementById('txt').value;
            str = str.replace(/[^\d]*/g, '');
            document.getElementById('txt').value = str;
        }
    </script>

</head>
<body onload="javascript:document.getElementById('txt').focus();">
    <input type="text" id='txt' onkeyup="blockChar();" />
</body>
</html>

and for 2nd u can use maximum length from textbox properites set it as 5

pradiprenushe · Answer 3 · 2012-07-26T23:38:00

Solution 3

Refer this link
Restrict user to enter only 1) numbers, 2) 10 digits, 3) alphanumeric in TextBox by javascript

Posted 26-Jul-12 23:38pm

pradiprenushe

_Amy · Answer 4 · 2012-07-26T23:37:00

Solution 2

Hi,
Try this:

ASP.NET

<asp:textbox id="txtUID" runat="server" maxlength="5" cssclass="TextBox" onkeypress="return onlyNumbers(this);"></asp:textbox>

JavaScript

<script type="text/javascript" language="javascript">
function onlyNumbers(evt) {
    var e = event || evt; // for trans-browser compatibility
    var charCode = e.which || e.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;
    return true;
}
</script>

--Amit

Posted 26-Jul-12 23:37pm

_Amy

Updated 27-Jul-12 0:05am

v3

Comments

veusk 27-Jul-12 6:01am

thanks , but where should I define that function ?

veusk 27-Jul-12 6:01am

in the taextbox event or page load or..?

_Amy 27-Jul-12 6:05am

This is javascript function. Use in Head tag of your html. See my updated Answer..

veusk 27-Jul-12 6:15am

ok, thanks, but I used master page and this page have only content palce holder,where write them? in head tag in the master page, is it true?

_Amy 27-Jul-12 6:17am

just before asp:content

sandeep nagabhairava 27-Jul-12 7:46am

nice..

sandeep nagabhairava · Answer 5 · 2012-07-27T02:03:00

hi
you can try like this.

ASP.NET

<asp:TextBox ID="TextBox1" runat="server" MaxLength="5"></asp:TextBox>
    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1"
        ErrorMessage="Enter a valid number" ValidationExpression="^\d$"></asp:RegularExpressionValidator>

Regards
Sandeep

restrict text box in asp.net and c#

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