UpdatePanel posting back entire page for the RadioButtonList control only

I have a webpage with 3 UpdatePanels on. They all work perfectly and have used UpdatePanels for years now and never come across this issue.

The RadioButtonList is posting back the entire page rather than the UpdatePanel and can’t see any errors in the output. I have never seen this behaviour before and copied the code into another project, and it worked as expected. All other controls on the page are working as expected in the same format.

Is there any other reasons that this behaviour could occur? My code below:

ASPX Code:

<asp:RadioButtonList ID="rbSelectWeek" runat="server" ClientIDMode="Static" CssClass="rb-select" OnSelectedIndexChanged="rbSelectWeek_SelectedIndexChanged" AutoPostBack="true" >
    <asp:ListItem Text="Previous" Value="1" />
    <asp:ListItem Text="Current" Value="2" Selected="True" />
    <asp:ListItem Text="Next" Value="3" />
    <asp:ListItem Text="All" Value="4" />
</asp:RadioButtonList>

<asp:UpdatePanel ID="upCaseViewer" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
        <asp:HiddenField ID="dtFrom" runat="server" ClientIDMode="Static" Value="1900-01-01" />
        <asp:HiddenField ID="dtEnd" runat="server" ClientIDMode="Static" Value="9999-12-31" />
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="cmbTeam" EventName="SelectedIndexChanged" />
        <asp:AsyncPostBackTrigger ControlID="rbSelectWeek" EventName="SelectedIndexChanged" />
    </Triggers>
</asp:UpdatePanel>

VB.Net / C#

Protected Sub rbSelectWeek_SelectedIndexChanged(sender As Object, e As EventArgs) Handles rbSelectWeek.SelectedIndexChanged
    Dim sVal As Integer = rbSelectWeek.SelectedValue

    rbSelectWeek.ClearSelection()
    rbSelectWeek.SelectedValue = sVal

    Select Case sVal
        Case 1
            dtFrom.Value = getFunctions.getPrevWeek("Start")
            dtEnd.Value = getFunctions.getPrevWeek("End")
        Case 2
            dtFrom.Value = getFunctions.getCurrWeek("Start")
            dtEnd.Value = getFunctions.getCurrWeek("End")
        Case 3
            dtFrom.Value = getFunctions.getNextWeek("Start")
            dtEnd.Value = getFunctions.getNextWeek("End")
        Case Else
            dtFrom.Value = getFunctions.getAll("Start")
            dtEnd.Value = getFunctions.getAll("End")
    End Select
End Sub

Answers:

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Method 1

AsyncPostBackTriggers do not work when an referenced element uses ClientIDMode="Static". So change it to

<asp:RadioButtonList ID="rbSelectWeek" runat="server" CssClass="rb-select" OnSelectedIndexChanged="rbSelectWeek_SelectedIndexChanged" AutoPostBack="true" >
    <asp:ListItem Text="Previous" Value="1" />
    <asp:ListItem Text="Current" Value="2" Selected="True" />
    <asp:ListItem Text="Next" Value="3" />
    <asp:ListItem Text="All" Value="4" />
</asp:RadioButtonList>

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0