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I want to use a Trigger event for an Update Panel that is being bound by a repeater, error: The ControlID property must be set on the trigger in UpdatePanel

Posted on 2008-11-03
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Last Modified: 2012-05-05
I have a Repeater that I am creating on Page_Load() that is creating a bunch of ImageButtons that have a OnClick function.  When they click the Image I want it to update a panel to perform the OnClick function of the ImageButton.    What is happening though is I am getting a: The ControlID property must be set on the trigger in UpdatePanel.   Any help would be appreciated.  Thanks
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Question by:higginsonline
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Expert Comment

by:David Robitaille
ID: 22867069
i got dificulty to understant what you mean, but here my advice.
dont put any trigger on the update panel, keep it conditional = true (a chlidrenastrigger false)
on the OnClick function, use the updatepanel.update() function to "trigger" the update
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Author Comment

by:higginsonline
ID: 22867219
Okay so far my updatePanel I now have:

 <asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server" ChildrenAsTriggers="false">
        <ContentTemplate>
       
        </ContentTemplate>
    </asp:UpdatePanel>

And for my code behind I have:
    Public Sub setClick()
        test.Text = "yup"
        UpdatePanel1.Update()
    End Sub

Is this what you mean?
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Expert Comment

by:David Robitaille
ID: 22867239
yes
but "test" label or textbox should be inside your ContentTemplate...
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Author Comment

by:higginsonline
ID: 22867287
Oops, yes indeed it should.   I am getting this error when I run it and click on the Link...

Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

I do not want to turn Off my Event Validation though for this to work.... any suggestions?
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LVL 18

Expert Comment

by:David Robitaille
ID: 22867345
well, it<s because you "created" the images buttons in the Page_Load.
  1. test, if you remove the avlidation, just to make sure it works without it, then pput it back
  2. check if you could "build" your repeater an other way. if your reapeter is declared on the aspx page and is only "binded" on page load, it should work.
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LVL 18

Expert Comment

by:David Robitaille
ID: 22867356
avlidation = EventValidation
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Author Comment

by:higginsonline
ID: 22867364
You were correct again I just put a If Not IsPostBack around the repeater.... and it works to some extent.

The OnClick function is refreshing the the whole page and not just my UpdatePanel section..
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Accepted Solution

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David Robitaille earned 500 total points
ID: 22867553
well, i suse the update in a different contex, the image button trigger a postback...
I just made test and  you could trigger a AsyncPostBackTrigger for the whole repeater with this Trigger : (i think you dont need to use update function with that, but i<m not that sure)
<Triggers>
<asp:AsyncPostBackTrigger ControlID="repeaterName" />
</Triggers>
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Author Comment

by:higginsonline
ID: 22867572
That worked perfectly.. Thank you for allllll your help :)
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LVL 18

Expert Comment

by:David Robitaille
ID: 22867603
it was a pleasure, thanks for the grade, and next time add Ajax in your Zones.
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