โค้ด: เลือกทั้งหมด
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script language="javascript">
function forceNumber(event)
{
var keyCode = event.keyCode ? event.keyCode : event.charCode;
if((keyCode < 48 || keyCode > 58) && keyCode != 8 && keyCode != 9)
return false;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="txtMobileNumber" Width="152px" runat="server" MaxLength="11" [color=#FF0000]onkeypress="return forceNumber(event);"[/color]
ToolTip="กรอกเบอร์โทรศัพท์"></asp:TextBox>
</from>
</body>
</html>