Question

Adding User Control to UpdatePanel

Asked by: patelajk

Hi

I am trying to add a user control to a UpdatePanel but cant seem to get it to work, if I dont use an update panel then it works fine.

I am sure there is something I am doing wrong and am missing something but no idea what

Any help would be great

This is what I have:

---- HTML MARKUP  --
	<table width="100%" cellpadding="0" cellspacing="0" class="grid">
		<tr><td style="padding:0px 0px 0px 0px">
		
		<table width="100%" cellpadding="0" cellspacing="0">
		<tr class="grid_header">
		<th colspan="2" align="left">
            <asp:LinkButton ID="linkLoadREProfile" runat="server" OnClick="linkLoadREProfile_Click">Full Real Estate Investor Profile</asp:LinkButton>
        	        <asp:UpdateProgress ID="UpdateProgress1" runat="server" >
						<ProgressTemplate>
							<img title = "working" alt="working..." src="/images/spinner.gif"" />
						</ProgressTemplate>
					</asp:UpdateProgress>
        </th>
		</tr>
		</table>
		
<asp:UpdatePanel ID="updateREProfile" runat="server" UpdateMode="Always">
   <ContentTemplate>
        <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
   </ContentTemplate>
   <Triggers>
        <asp:AsyncPostBackTrigger ControlID="linkLoadREProfile" EventName="onClick"/>   
   </Triggers>
</asp:UpdatePanel>
 
---- CODE BEHIND --
    Private Property LastLoadedControl() As String
        Get
            Return TryCast(ViewState("LastLoaded"), String)
        End Get
        Set(ByVal value As String)
            ViewState("LastLoaded") = value
        End Set
    End Property
    
    Private Sub LoadUserControl()
        Dim controlPath As String = LastLoadedControl
        
        If Not String.IsNullOrEmpty(controlPath) Then
            PlaceHolder1.Controls.Clear()
            Dim uc As UserControl = DirectCast(LoadControl(controlPath), UserControl)
             updateREProfile.ContentTemplateContainer.Controls.Add(uc)
            ' PlaceHolder1.Controls.Add(uc)
        End If
    End Sub
 
    Protected Sub linkLoadREProfile_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        LastLoadedControl = BASE_PATH & "RE_InvestorProfile.ascx"
        LoadUserControl()
    End Sub
 
Protected Sub page_load(ByVal obj As Object, ByVal e As EventArgs)
 LoadUserControl()
End Sub

                                  
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Asked On
2009-06-18 at 00:48:54ID24501625
Topic

Programming for ASP.NET

Participating Experts
2
Points
250
Comments
7

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Answers

 

by: NNirmalanPosted on 2009-06-18 at 01:03:00ID: 24655307

 

by: patelajkPosted on 2009-06-18 at 01:06:44ID: 24655329

thats where i got the above code from but it doesnt seem to work for me

 

by: ddayx10Posted on 2009-06-18 at 01:47:33ID: 24655528

I had this problem before with an update panel, trying to add to a contenttemplate. I never could get the right type of object built that the contenttemplate would accept it....drove me nuts!

Maybe I've gotten smarter since then... hmmm.

Well I feel smarter, but I dunno that this helps you at all :)

I took pieces of your code and began to add them to my own page to see if I could get this done. What I found is that I could add a usercontrol to the contenttemplate with ease. Then I begain adding components or concepts from your code in in an attempt to break things....

I never was able to cause it to fail. The only thing I didnt do was add the viewstate stuff and dynamically create the string for loading of the usercontrol.

I'm using NET 3.5 maybe that makes some difference?

I'm posting what I built below in case it can be of any use to you.

The one problem with your code I did not was in the updatepanel triggers section. I had to change your code slightly thus:
<asp:AsyncPostBackTrigger ControlID="linkLoadREProfile" EventName="Click" />

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default10.aspx.vb" Inherits="Default10" %>
 
<!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 runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
	<asp:ScriptManager ID="ScriptManager1" runat="server">
	</asp:ScriptManager>
	
	<asp:UpdateProgress ID="UpdateProgress1" runat="server">
		<ProgressTemplate>
			<img title="working" alt="working..." src="img/Boatman.jpg" />
		</ProgressTemplate>
	</asp:UpdateProgress>
 
	
	
	<asp:LinkButton ID="linkLoadREProfile" runat="server" OnClick="linkLoadREProfile_Click">Full Real Estate Investor Profile</asp:LinkButton>
 
 
	<asp:UpdatePanel ID="up1" runat="server">
	<ContentTemplate>
	<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
	</ContentTemplate>
	
	<Triggers>
		<asp:AsyncPostBackTrigger ControlID="linkLoadREProfile" EventName="Click" />
	</Triggers>
	
	</asp:UpdatePanel>
 
 
 
    </form>
</body>
</html>
 
 
****************CODE BEHIND*****************
 
Partial Class Default10
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        PlaceHolder1.Controls.Clear()
 
        Dim uc As UserControl = DirectCast(LoadControl("uc.ascx"), UserControl)
 
 
        up1.ContentTemplateContainer.Controls.Add(uc)
 
        If (IsPostBack) Then
            System.Threading.Thread.Sleep(2000)
        End If
 
 
    End Sub
 
    Protected Sub linkLoadREProfile_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles linkLoadREProfile.Click
 
    End Sub
End Class

                                              
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by: ddayx10Posted on 2009-06-18 at 01:51:22ID: 24655549

You didn't say what the error you were having was specifically. I assumed it was simply that no errors occurred, but you got no usercontrol in the contenttemplate.

This strikes me as strange since I got an error until I fixed that trigger property. My guess is that there is something keeping you from loading the proper usercontrol, or there is a difference in our platforms that is causing me to succeed where you fail.

 

by: patelajkPosted on 2009-06-18 at 02:46:39ID: 24655809

ddayx10:

thanks, you have put the code into page_load event...

i only want the control to load if they click the link button

 

by: ddayx10Posted on 2009-06-18 at 03:07:27ID: 24655914

That's strange. I only did what you did:
Protected Sub page_load(ByVal obj As Object, ByVal e As EventArgs)
 LoadUserControl()
End Sub

I fail to see how my code is different from your except I took a shortcut. I also fail to see why it would matter whether I did it on button click on page load? Just to be sure though I wired it up the way you just mentioned and it still works.

I'm still saying your asyncpostbacktrigger event is wrong which would cause the event not to fire. You wouldnt see this without the updatepanel because you wouldnt have the asyncpostback trigger.

Partial Class Default10
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If (IsPostBack) Then
            System.Threading.Thread.Sleep(2000)
        End If
 
 
    End Sub
 
    Protected Sub linkLoadREProfile_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles linkLoadREProfile.Click
        loadUserControl()
    End Sub
 
    Public Sub loadUserControl()
        PlaceHolder1.Controls.Clear()
        Dim uc As UserControl = DirectCast(LoadControl("uc.ascx"), UserControl)
        up1.ContentTemplateContainer.Controls.Add(uc)
    End Sub
 
End Class

                                              
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by: ddayx10Posted on 2009-06-18 at 03:10:05ID: 24655928

I suppose in yours the path was empty on page_load and therefore no control was loaded...but since thats always going to be the case I wonder why you've made that choice? Must be some reason beyond the scope of what I can see :)

20120131-EE-VQP-002

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