C# – Timer in UpdatePanel

asp.netcmaster-pagestimerupdatepanel

I have an asp:UpdatePanel with an asp:Timer. These are in a Master/Content Page. The code is below:

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
        <asp:Timer ID="Timer1" runat="server" Interval="5000" OnTick="Timer1_Tick"></asp:Timer>
    </ContentTemplate>
</asp:UpdatePanel>

But when the timer fires, I get the folowing error:

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near '

This works in a standalone web form, but not in a content page with a master page.

Can anyone explain a fix for this?

Thanks in advance for any help!!

Best Answer

Is there a specifc reason why you have the Timer control in the UpdatePanel?

Every time I have needed to use a Timer control to cause an UpdatePanel refresh, I have set it up like the following and it works fine with MasterPages:

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> 
    <Triggers>
        <asp:AsyncPostBackTrigger  ControlID="Timer1" EventName="Tick" />
    </Triggers>
    <ContentTemplate> 
        <!-- your content here, no timer -->
    </ContentTemplate> 
</asp:UpdatePanel> 

<asp:Timer ID="Timer1" runat="server" Interval="5000" OnTick="Timer1_Tick">
</asp:Timer>

Use the Trigger to cause the UpdatePanel to refresh from the Tick event. You only want to embed content in your UpdatePanel if possible.

Related Solutions

AJAX PageRequestManagerParserErrorException error in asp.net page

You might be using response.write, server.transfer or similar within updatepanel; avoid that.

refer to http://weblogs.asp.net/leftslipper/archive/2007/02/26/sys-webforms-pagerequestmanagerparsererrorexception-what-it-is-and-how-to-avoid-it.aspx

AJAX updatepanel giving error

I had a similar problem in the past trying to stream an excel document with a button inside an update panel. Here is my solution, hope it helps.

VB.NET:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Dim sm = ScriptManager.GetCurrent(Me.Page)
    sm.RegisterPostBackControl(Me.YOUR_BUTTON)

    AddPostBackTrigger(Me.YOUR_BUTTON.UniqueID.ToString())

End Sub


Public Sub AddPostBackTrigger(ByVal ControlId As String)
    Dim existingTrigger = FindPostBackTrigger(ControlId)
    If existingTrigger Is Nothing Then
        Dim trigger As New PostBackTrigger()
        trigger.ControlID = ControlId
        Me.YOUR_UPDATE_PANEL_GOES_HERE.Triggers.Add(trigger)
    End If
End Sub
Public Sub RemovePostBackTrigger(ByVal ControlId As String)
    Dim existingTrigger = FindPostBackTrigger(ControlId)
    If existingTrigger IsNot Nothing Then
        Me.YOUR_UPDATE_PANEL_GOES_HERE.Triggers.Remove(existingTrigger)
    End If
End Sub
Private Function FindPostBackTrigger(ByVal ControlId As String) As PostBackTrigger
    For Each Trigger In Me.YOUR_UPDATE_PANEL_GOES_HERE.Triggers
        If Trigger.GetType().Name = "PostBackTrigger" Then
            Dim pt = CType(Trigger, PostBackTrigger)
            If pt.ControlID = ControlId Then
                Return pt
            End If
        End If
    Next
    Return Nothing
End Function

C#:

protected void Page_Load(object sender, EventArgs e)
{
    ScriptManager sm = ScriptManager.GetCurrent(Page);
    if (sm != null) sm.RegisterPostBackControl(YOUR_CONTROL);
    AddPostBackTrigger(YOUR_CONTROL.UniqueID);
}

private void AddPostBackTrigger(string controlId)
{
    PostBackTrigger existingTrigger = FindPostBackTrigger(controlId);

    if (existingTrigger != null)
    {
        var trigger = new PostBackTrigger {ControlID = controlId};
        YOUR_UPDATE_PANEL.Triggers.Add(trigger);
    }
}

private PostBackTrigger FindPostBackTrigger(string controlId)
{
    return
        YOUR_UPDATE_PANEL
            .Triggers.OfType<PostBackTrigger>()
            .FirstOrDefault(pt => pt.ControlID == controlId);
}

Best Answer

Related Solutions

AJAX PageRequestManagerParserErrorException error in asp.net page

AJAX updatepanel giving error

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