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01.21.2008 at 07:40AM PST, ID: 23098371
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Raising events form a UpdatePanel in a control to the page it is on

Tags: VB.Net and AJAX 1.0, IE and Firefox
G Morning Everyone,
I am running into an issue when raising events for a usercontrol containing an UpdatePanel to the page it is one.
-An event is triggered in an UpdatePanel in the usercontrol the fires a Public Event.
-This event is grabbed by a handler on the page it sits on
-A series of things are done to other controls on the page in the handler
When i walk thru the process in debug i see all the code fire but then it returns to the page and none of the changes have occurred
ex. The event handler turns the control that raised the event visible=false and another one visible=true but that does not occur

Button inside of the Update Panel in the usercontrol
Protected Sub btnNextQuestion_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnNextQuestion.Click
        Dim lastquestion As Integer = CInt(Me.lblLastQuestion.Text)
        Dim check As Boolean
        Dim requestid As Integer = CInt(Me.lblRequestID.Text)
        Dim level As Integer = CInt(Me.lblLevel.Text)

        SaveCompletedQuestions(requestid, gvQuestions, Published)


        check = LoadUI(requestid)
        If check = False Then
           
            Me.gvQuestions.Visible = False
            Me.gvProducts.Visible = False
            Me.btnNextQuestion.Visible = False
            CommentControls(False)
            'raise event
            RaiseEvent DisplayRequestSummary()
        End If

The Code in the page it sits on:
AddHandler ucRequestEditor.DisplayRequestSummary, AddressOf DisplayRequestSummary

Private Sub DisplayRequestSummary()
        Dim ucPeople As People = CType(Me.FindControl("People1"), People)
        'When click on "Review Request" in clientUI user control, show the requestSummary user control
        Dim ucRequestSummary As requestSummary = CType(Me.FindControl("RequestSummary1"), requestSummary)
        Dim ucClientUI As clientUI = CType(Me.FindControl("ClientUI1"), clientUI)
        Dim ucRequestEditor As requestEditor = CType(Me.FindControl("RequestEditor1"), requestEditor)
        'Added 9/14 by jv-----
        Dim ucSubmitRequest As RequestDetail_SubmitRequest = CType(Me.FindControl("SubmitRequest1"), RequestDetail_SubmitRequest)
        With ucSubmitRequest
            .Visible = True
            .RequestID = ucClientUI.RequestID
            .RequestRegion = ucPeople.Region
            .RequestedForID = ucPeople.RequestedForID
        End With
        '---------------------
        With ucRequestSummary
            .Visible = True
            .RequestID = ucClientUI.RequestID
            .InitializeUC()
        End With
        ucClientUI.Visible = False
        ucRequestEditor.Visible = False
    End Sub

I have run into this issue before, seems to happen when ever i raise an event from inside an AJAX updatepanel event
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Question Stats
Zone: Microsoft
Question Asked By: jvancojr
Solution Provided By: RockHead
Participating Experts: 1
Solution Grade: A
Views: 32
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01.21.2008 at 10:15AM PST, ID: 20708098

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01.21.2008 at 10:43AM PST, ID: 20708304

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01.21.2008 at 12:36PM PST, ID: 20709405

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01.21.2008 at 12:48PM PST, ID: 20709510

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01.21.2008 at 01:09PM PST, ID: 20709686

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01.21.2008 at 10:15AM PST, ID: 20708098
You'll need to surround all the other stuff that is updated with an update panel and add some triggers that are fired by the UserControls event.

http://www.asp.net/ajax/documentation/live/overview/UpdatePanelOverview.aspx
 
01.21.2008 at 10:43AM PST, ID: 20708304
The button that is clicked in the UpdatePanel fires off a process that ends up doing one of two things when it is done. Either displaying the next set of questions in a datalist (This UpdatePanel is in it own UserControl) or raises an event to the page saving that the questions are completed.
In debug mode i see the event getting raised and executed but nothing happens to the page.
 
01.21.2008 at 12:36PM PST, ID: 20709405
That's because when you fire an event in an UpdatePanel, only that UpdatePanel is updated.  So if you want other bits of your page to update you must surround those bits with an UpdatePanel and set a trigger to update on the event from the control.
 
01.21.2008 at 12:48PM PST, ID: 20709510
That part I understand. I am looking to see if there is a way to raise an event to to the page that control is sitting on. I am not sure it is possible but i wanted to ask.
Can an action inside of an update panel be 'bubbled up' to the control/page it is sitting in?
 
01.21.2008 at 01:09PM PST, ID: 20709686
Yes.  It can.  The event IS being bubbled up by default.  What's not happening is the page itself is not updating anything EXCEPT what's part of the update panel.  When you raise an event within an UpdatePanel ONLY the stuff within the updatepanel gets updated.  If you want anything outside of the update panel to be updated you must surround ANYTHING in the main page that you want to update with an update panel.  Then either use triggers or set the UpdateMode="Always" within that panel.
Accepted Solution
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628