Hello all, ive created the folllowing simple example to shouw you the error im getting when using validation with an update panel.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = TextBox1.Text;
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="TextBox1" runat="server" Height="17px" Width="81px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1"
ErrorMessage="RequiredFieldValidator" ValidationGroup="TEST">*</asp:RequiredFieldValidator>
<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="True">
<asp:ListItem>0</asp:ListItem>
<asp:ListItem>1</asp:ListItem>
</asp:DropDownList><br />
<asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="TEST" OnClick="Button1_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click"/>
<asp:AsyncPostBackTrigger ControlID="DropDownList1" EventName="SelectedIndexChanged"/>
</Triggers>
</asp:UpdatePanel>
</div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>
</body>
</html>
Whne the above page is loaded, if the button is clicked, the validation will appear. However, if I change the fropdown value first, then try clicking the button, the validation (*) will not appear.
Any ideas how to always get the validation to appear?
