Hi,

1. I have a Custom User Control that looks like this:

<dxcp:ASPxCallbackPanel runat="server" ID="cbSecondaryDimControl" ClientInstanceName="cbSecondaryDimControl"
    CssClass="cbSecondaryDimControl"
    oncallback="cbSecondaryDimControl_Callback" >
    <PanelCollection>
    <dxp:PanelContent>
   
        <table id="tableSecDim" runat="server" border="0" cellspacing="0" cellpadding="0" class="tableSecDim">
            <tr>
                <td id="cell1" runat="server" class="secondaryDimControlLeft"></td>
                <td id="cell2" runat="server" class="secondaryDimControlFill secondaryDimControlSpacer"></td>
                <td id="cell3" runat="server" class="secondaryDimControlFill">
                   <dxe:ASPxLabel ID="secondaryDimensionLabel" runat="server">
                    <ClientSideEvents
                     Click="function (s,e) { SecDimControl_Click(s,e); }"
                     />
                   </dxe:ASPxLabel>
                </td>
                <td id="cell4" runat="server" class="secondaryDimControlFill secondaryDimControlSpacer"></td>
                <td id="cell5" runat="server" class="secondaryDimControlFill secondaryDimControlButton">
                    <dxe:ASPxImage ID="secondaryDimControlButton" runat="server" ImageAlign="Middle"
                        ImageUrl="~/App_Themes/Aptitrak/Images/secondaryValueExpandButtonUp.png"
                        CssClass="secondaryDimControlButton">
                    </dxe:ASPxImage>
                </td>
                <td id="cell6" runat="server" class="secondaryDimControlRight"></td>
            </tr>
        </table>
       
    </dxp:PanelContent>
    </PanelCollection>

2. I can have one to 'n' of these on an asp.net web page contained within other controls.

3. I need to know when the label control (ID="secondaryDimControlButton") is clicked, from which parent control it was clicked from and perfrom a callback so some server-side updates can be made to that control.

4. On the click I call the following function client-side function:

 function SecDimControl_Click(s,e)
{
    var params = CallbackParamsToString({ "Action": "SecDimClick" });
    cbSecondaryDimControl.PerformCallback(params);
}

s.name = "ctl00_MainTab_PagePane1_pagesPanel_pagePanelYears_secDim2006_cbSecondaryDimControl_secondaryDimensionLabel"

s.uniqueID = "ctl00$MainTab$PagePane1$pagesPanel$pagePanelYears$secDim2006$cbSecondaryDimControl$secondaryDimensionLabel"

THOUGH the client side also shows this:

this.name="ctl00_MainTab_PagePane1_pagesPanel_pagePanelMeasures_secDimDataPart_cbSecondaryDimControl"

this.uniqueID="ctl00$MainTab$PagePane1$pagesPanel$pagePanelMeasures$secDimDataPart$cbSecondaryDimControl"

5. I want to perform the callback for the control returned in the 's' parameter, not the control specified by the 'this'
But when I call cbSecondaryDimControl.PerformCallback(params);  and use the 'this' property on the server-side it is not for the correct control.

Is there a way to accomplish what I want to do?

Thanks.

Kim

Hi Kim,

I reviewed your code and the only suspicious place I found is assignation
of the ClientInstanceName to the ASPxCallbackPanel:

<dxcp:ASPxCallbackPanel ... ClientInstanceName="cbSecondaryDimControl">

If to simplify it a little, the ClientInstanceName works in the following way:
When a control is rendered on a page, we create a client object that
represents the control on the client side. Then, we save a reference to this
object in the window's property with a name equal to the control's ClientInstanceName:

window['cbSecondaryDimControl'] = new ASPxClientCallbackPanel('someContainer_CallbackPanelID');

Then, it's possible to reference this client object by the client instance name:

myClientInstanceName.PerformCallback(param);

We can access window's properties using this simplified syntax specifying
only the property name, but it's also possible to use the expanded form

window["myClientInstanceName"].PerformCallback(param);

If you specify the ClientIntanceName for the control that is used within
a user control, and you place several those user controls on the page, then
each client object will overwrite the previous one because they have the
same ClientInstanceName:

window['cbSecondaryDimControl'] = new ASPxClientCallbackPanel('someContainer_ID1');
...
window['cbSecondaryDimControl'] = new ASPxClientCallbackPanel('someContainer_ID2');
...
window['cbSecondaryDimControl'] = new ASPxClientCallbackPanel('someContainer_ID3');
...

Finally, we have that the last client object can be referenced by the name
"cbSecondaryDimControl" but all the previous ones are lost - there are no
references to these objects.

So you can take it as a rule that all the names within a user control must
depend on the user control's ClientID.

 Hi Victor,

I have a similar problem I think:

I have a UserControl hosted in a page. This page has an ASPxCallbackPanel define like that:

<dxcp:ASPxCallbackPanel runat="server" ID="ASPxCallbackPanel1" ClientInstanceName="CallbackPanel">

It's working well.

Now I have a second ASPxCallbackPanel define in the UserControl define like that (this callbackpanel doesn't host the UserControl):

<dxcp:ASPxCallbackPanel runat="server" ID="CallbackPanelPopup" ClientInstanceName="CallbackPanelPopup" OnCallback="CallbackPanel_Callback" ClientVisible="true" HideContentOnCallback="false" ShowLoadingPanel

="true">

For this one, I cannot call the method PerformCallback properly from javascript.

Here is the generated code from the code source: 

var dxo = new ASPxClientCallbackPanel('ctl00_phContentEmp_Popup_CallbackPanelPopup');

window[

'CallbackPanelPopup'] = dxo;

dxo.callBack =

function(arg) { WebForm_DoCallback('ctl00$phContentEmp$Popup$CallbackPanelPopup', arg, aspxCallback, 'ctl00_phContentEmp_Popup_CallbackPanelPopup', aspxCallbackError, true); };

dxo.uniqueID =

'ctl00$phContentEmp$Popup$CallbackPanelPopup';

dxo.EndCallback.AddHandler(

function(s, e) { OnEndCallback(); });

And here is what I try to do: 

1) window[

"ctl00_phContentEmp_Popup_CallbackPanelPopup"].PerformCallback(postponedCallbackValue);

2) ctl00_phContentEmp_Popup_CallbackPanelPopup.PerformCallback(postponedCallbackValue);

3) window["CallbackPanelPopup"].PerformCallback(postponedCallbackValue);

The problem for 1) is "Object doesn't support this property or method"

For 2) it is the same error: "Object doesn't support this property or method"

And for the 3) I have this: "'window.CallbackPanelPopup' is null or not an object"

I'm a bit confused now... am I doing something wrong, or is there an other method to call the method?

Thanks,

Quentin

 All right, problem fixed... problem in the declaration of my callback.

Cheers,

Quentin