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HomeHomeDNN Open Source...DNN Open Source...Provider and Extension ForumsProvider and Extension ForumsClientAPIClientAPIRegisterPostBackEventHandler works on DNN4.5.3 BUT NOT Work on 4.8.0RegisterPostBackEventHandler works on DNN4.5.3 BUT NOT Work on 4.8.0
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4/21/2008 8:34 PM
 
hz yang

Joined: 9/27/2006
Posts: 13

Hi, Jon and everybody:

    I work on a module which using ClientAPI and call RegisterPostBackEventHandler on Page_Init method like this:

        Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
                ClientAPI.RegisterPostBackEventHandler(Page, "ClientSave", AddressOf ClientSaveDataCallBack, False)
        End Sub

    It works perfect on DNN 4.5.3 and does not work on 4.8.0. so in 4.8.0, I'm reading Jon's document and do the follow steps to enable RegisterPostBackEventHandler

 

    1. Add <input id="__dnnVariable" type="hidden" name="__dnnVariable" runat="server"> on .ascx files, doesn't work

    2.use the Hack method which Joe suggest on the PDF document which modify onParentOnLoad (and using RegisterPostBackEventHandler on OnParentOnLoad)

    3.using ClientAPI.RegisterClientVariable(Page, "__dnnVariable", "", True) method on Page_Load to register __dnnVariable

 

and as the same, it doesn't work and it says:

Error: Edit RedstartForm is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases. ---> System.Web.HttpException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases. at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.UI.Utilities.ClientAPI.RegisterPostBackEventHandler(Control objParent, String strEventName, PostBackEvent objDelegate, Boolean blnMultipleHandlers) at Confidence.Modules.RedstartForm.EditRedstartForm.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---


    but it work perfect on DNN4.5.3. so what should I do? back to version 4.5.3?

 

    thanks everybody
 
New Post
4/23/2008 9:32 PM
 
hz yang

Joined: 9/27/2006
Posts: 13

Can Joe or anybody help? I will have to lower my DNN version to 4.5.3 if cannot handle this...
 
New Post
4/24/2008 2:24 PM
 
Jon Henning

www.codeendeavors.com
Joined: 3/20/2003
Posts: 1767

I don't really know why you would be getting this error.  The only time the ClientAPI attempts to add a control to the collection is when the hidden control it needs to pass state back and forth doesn't already exist on the page.  Could you open up your site's default.aspx file and verify that the following line exists?

<input id="__dnnVariable" runat="server" name="__dnnVariable" type="hidden" />

 
 
New Post
12/10/2008 9:03 AM
 
Tender

Joined: 1/10/2008
Posts: 1

Hi,

 

i'm having excactly the same problem; When getting to the ClientAPI.RegisterPostBackEventHandler the same errormessage (see below) appears - What's wrong?

 

regards, Tender

 

***

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

            If Not Page.IsPostBack Then

                If DotNetNuke.Framework.AJAX.IsInstalled Then

                    DotNetNuke.Framework.AJAX.RegisterScriptManager()

                End If

                If ClientAPI.BrowserSupportsFunctionality(ClientAPI.ClientFunctionality.DHTML) Then

                    ClientAPI.RegisterClientReference(Me.Page, ClientAPI.ClientNamespaceReferences.dnn)

                    ClientAPI.RegisterPostBackEventHandler(Me.Page, "CustomPostbackClient", AddressOf CustomPostbackServer, False)

                End If

            End If

        End Sub

***

The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

Source Error: 

Line 28:                     ClientAPI.RegisterClientReference(Me.Page, ClientAPI.ClientNamespaceReferences.dnn)
Line 29: 
Line 30:                     ClientAPI.RegisterPostBackEventHandler(Me.Page, "CustomPostbackClient", AddressOf CustomPostbackServer, False) 
Line 31: 
Line 32:                 End If

Source File: ###    Line: 30

Stack Trace: 

[HttpException (0x80004005): The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.]
   System.Web.UI.ControlCollection.Add(Control child) +11010362
   DotNetNuke.UI.Utilities.ClientAPI.RegisterPostBackEventHandler(Control objParent, String strEventName, PostBackEvent objDelegate, Boolean blnMultipleHandlers) +256
   Modules.Grids.View.Page_Load(Object sender, EventArgs e) in ###:30
   System.Web.UI.Control.OnLoad(EventArgs e) +132
   System.Web.UI.Control.LoadRecursive() +66
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Control.LoadRecursive() +191
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2428

[PageLoadException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.]
   DotNetNuke.Services.Exceptions.Exceptions.ProcessPageLoadException(Exception exc, String URL) +468
   System.Web.UI.TemplateControl.OnError(EventArgs e) +11026190
   System.Web.UI.Page.HandleError(Exception e) +109
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11031963
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11031514
   System.Web.UI.Page.ProcessRequest() +91
   System.Web.UI.Page.ProcessRequest(HttpContext context) +240
   ASP.default_aspx.ProcessRequest(HttpContext context) +52
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +599
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171

 
 
New Post
1/14/2009 7:12 AM
 
InSoMnIa

Joined: 11/20/2005
Posts: 49

Same problem with 5.0.0 !!!
 
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