Hi
So many time, we will get scenario to do validation work or some other stuff using JavaScript in asp.net. Here is the basic validation syntax using JavaScript in asp.net.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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 id="Head1" runat="server">
<title></title>
<script type="text/javascript">
function doValidation() {
var name = document.getElementById("<%=txtEmpName.ClientID%>").value;
var empSal = document.getElementById("<%=txtEmpSal.ClientID%>").value;
var empAddress = document.getElementById("<%=txtEmpAddress.ClientID%>").value;
if (name == "") {
alert("Please enter the EmpName");
}
else if (empSal == "") {
alert("Please enter the EmpSal");
}
else if (isNaN(empSal)) {
alert("Invalid EmpSal");
}
else if (empAddress == "") {
alert("Please enter the EmpAddress");
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
EmpName:
<asp:TextBox ID="txtEmpName" runat="server" />
<br />
<br />
EmpSal
<asp:TextBox ID="txtEmpSal" runat="server" />
<br />
<br />
EmpAddress
<asp:TextBox ID="txtEmpAddress" runat="server" />
<br />
<br />
<asp:Button ID="btnClick" runat="server" OnClientClick="doValidation();return false;"
Text="Submit" />
</div>
</form>
</body>
</html>
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