Validation with two text boxes for sample purpose.
<head runat="server">
<title></title>
<script type="text/javascript">
function validate() {
var x = document.getElementById("<%=txtName.ClientID%>").value;
var y=document.getElementById("<%=txtCity.ClientID%>").value;
if (x == "") {
alert("Please enter Name");
}
if (y == "") {
alert("Please enter City");
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
Name<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<br />
City
<asp:TextBox ID="txtCity" runat="server"></asp:TextBox>
<br />
<asp:Button ID="btnAdd" runat="server" Text="Add" OnClientClick="return validate();"/>
</div>
</form>
</body>
</html>
<head runat="server">
<title></title>
<script type="text/javascript">
function validate() {
var x = document.getElementById("<%=txtName.ClientID%>").value;
var y=document.getElementById("<%=txtCity.ClientID%>").value;
if (x == "") {
alert("Please enter Name");
}
if (y == "") {
alert("Please enter City");
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
Name<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<br />
City
<asp:TextBox ID="txtCity" runat="server"></asp:TextBox>
<br />
<asp:Button ID="btnAdd" runat="server" Text="Add" OnClientClick="return validate();"/>
</div>
</form>
</body>
</html>
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