How to Restrict user to enter only alphabates in TextBox by javascript in asp.net

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How to Restrict user to enter only alphabates in TextBox by javascript in asp.net.
Alphabates only(a,b,c,d,e,f,g,h,i,.............z).
and (A,B,C,D,E,F,G,H,I,............Z).

Posted 27-Sep-11 1:35am

Shukla Pawan

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sujit0761 · Answer 1 · 2011-09-27T01:43:00

XML

function AplhabetsOnly(var1) {
            var num = document.getElementById(var1).value;
            var letter= 0;
            for (n = 0; n < num.length; n++) {
                letter= num.charCodeAt(n) >= 65 && num.charCodeAt(n) <= 90 || num.charCodeAt(n) == 97 || num.charCodeAt(n) == 122;
                if (!letter) {
                    alert('Enter alphabets Only');

                }
            }
            document.getElementById('<%=txtMobile.ClientID %>').value = "";
            document.getElementById(var1).focus();

        }

Muralikrishna8811 · Answer 2 · 2011-09-27T01:49:00

Hi,

Here I tried some code for you

Try this

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script language ="javascript" >

        function chg() {
          
            if (parseInt(event.keyCode) > 64 ) {
                if (parseInt(event.keyCode) < 91) {
                 
                }
                else {
                    var str = new String();
                   
                    str = document.getElementById("txtmbno").value;
                    document.getElementById("txtmbno").value = str.substring(0, str.length - 1);
                   
                }
            }
            else {
                var str = new String();
                str = document.getElementById("txtmbno").value;
                document.getElementById("txtmbno").value = str.substring(0, str.length - 1);
              
            } 
          return true;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
     <input type ="text" id="txtmbno"  onkeyup ="chg()" />
     

    </div>
    </form>
</body>
</html>

you can change this code for accepting only numeric also

All the Best

P.Salini · Answer 3 · 2011-09-27T01:39:00

Solution 1

var text=document.getElementById("your id");
if (!text.value.match(/^[a-zA-Z]+$/))
{
   alert("Please Enter only letters in text");
}

Posted 27-Sep-11 1:39am

P.Salini

v2

rkthiyagarajan · Answer 4 · 2011-09-27T02:19:00

Hi Shukla Pawan,

All of them gave you good example but you should know how that works!?.So you learn first? how.. Nothing just you revised your beginning computer class notes just glance the keyboard ASCII codes that is the main part of Restrict the particular keys in keyboard using JavaScript, then you got complete idea of making some task like this....

All the best
Happy coding..

devildx2050 · Answer 5 · 2011-09-27T17:41:00

XML

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <cc1:FilteredTextBoxExtender ID="TextBox1_FilteredTextBoxExtender"
            runat="server" Enabled="True" TargetControlID="TextBox1"
            ValidChars="abcdefghijklmnopqrstuvwxyz">
        </cc1:FilteredTextBoxExtender>
    </div>
    </form>
</body>
</html>

ajax control toolkit select Filter textBox extender & set its Valid Char property...your problem has been solved

How to Restrict user to enter only alphabates in TextBox by javascript in asp.net

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