Java Script Validation allow Only Alpha Numeric
<script type="text/javascript">
$(function () {
$('input.alpha[$id=tb1]').keyup(function () {
if (this.value.match(/[^a-zA-Z0-9 ]/g)) {
this.value = this.value.replace(/[^a-zA-Z0-9 ]/g, '');
}
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div class="bigDiv">
<h2>Allow Only Alphanumeric Characters in a TextBox</h2>
<asp:TextBox ID="tb1" runat="server" class="alpha"
Text="Try entering Non alphanumeric char"
ToolTip="Try entering Non alphanumeric char"/>
<br /><br />
Tip: Examples of some non-alphanumeric characters <br />
are ~!@~#$%^&* and so on.
</div>
</form>
</body>
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