Create alphanumerical TextBox in ASP.Net using Javascript

- Create alphanumerical TextBox in ASP.Net

- Create alphanumerical TextBox in Javascript

Here we are going to learn how to create a only alphanumeric TextBox in ASP.Net application.
Alphanumeric means TextBox allow only alphabetic and Numeric value.

Here we can solve this example using javascript events.

 Write below javascript function code in your Head tag : -

<head runat=”server”>
<title>Create Alphanumeric TextBox</title>
<script type=”text/javascript”>

function EnteralfanumericOnly(val) {
var valuee = (val.which) ? val.which : key.valuee

if (!(valuee==8 || valuee==46)&&(valuee < 48 || valuee > 57) && (valuee < 97 || valuee > 122)) {
return false;
else {
return true;


- Write below code in Body tag for design web forms:-

<form id=”form1″ runat=”server”>
<table style=”z-index: 100; left: 432px; position: absolute; top: 168px”>
<td style=”width: 289px”>
<strong>Allow only alphanumeric value in TextBox</strong></td>
<td style=”width: 289px”>
<asp:TextBox ID=”txtFname” runat=”server” onkeypress=”return EnteralfanumericOnly(event)” Width=”168px”></asp:TextBox></td>

The output of alphanumerical textbox using javascript is like:

Create alphanumeric Textbox in ASP.Net

Create alphanumeric Textbox in ASP.Net

I hope this example of javascript will help you….

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