Entries Collection Error when used with RadAjaxManagerProxy

[Jerry]

In my case there seems to be a problem with the RadDropDownTree in which the DropDownTreeEntries collection is not properly managed by RadDropDownTree.  When RadAjaxManagerProxy is configured as shown in the following code example the Entries collection is always appended to, It never shrinks. If I comment out the line containing AjaxUpdatedControl then the RadDropDownTree begins working correctly again. I also tested this in a straight up ASP page with RadAjaxManager and found that RadDropDownTree works as expected. It seems that this problem only exists if using a RadAjaxManagerProxy on a Content page. Has anyone else seen this behavior and is there a workaround.    
  
 <telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server">       
        <AjaxSettings>           
            <telerik:AjaxSetting AjaxControlID="RadButton2">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="RadGrid1" UpdatePanelCssClass="MasterUpdatePanel" />
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
    </telerik:RadAjaxManagerProxy>

[Shinu]

Hi Jerry,

Please have a look into the sample code snippet which works fine at my end.

Master Page :

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
</telerik:RadAjaxManager>

Content Page:

<telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="RadButton1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadGrid1" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManagerProxy>
<telerik:RadDropDownTree ID="RadDropDownTree1" runat="server" DataFieldID="EmployeeID"
    DataFieldParentID="ReportsTo" DataTextField="EmployeeID" DataSourceID="SqlDataSource2">
</telerik:RadDropDownTree>
<telerik:RadButton ID="RadButton1" runat="server" Text="Submit">
</telerik:RadButton>
<telerik:RadGrid ID="RadGrid1" runat="server" DataSourceID="SqlDataSource1">
</telerik:RadGrid>

Please provide your code if it doesn't help.
Thanks,
Shinu.

[Jerry]

The problem is in the RadDropDownTree Entries collection. Put a breakpoint in your submit button handler. Run the project in debug, select a node or two from the DropDownTree, click your submit button,  and when it hits your breakpoint, take a look at RadDropDownTree1 Entries collection in the watch window. Click continue to allow the project to continue running. Now change your DropDownTree selection and re-submit. When it hits the breakpoint, take a look at the Entries collection. You should see that the your current selections have been appended to your previous selection. If you comment out RadAjaxManagerProxy1 and re-run these steps you will see a completely different behavior in how RadDropDownTree manages the Entries collection.     

[Plamen]

Hello,

I have finally replicated the issue described. In such cases when server side changes have to be retrieved and used from RadDropDownTree we kindly recommend using AutoPostBack="true" of the control. 

Regards,
Plamen
Telerik

 

 

[Jerry]

I implemented your suggestion and also moved my RadDropDownTree into a RadToolbar.  It seems to work correctly now. Thank You.

[Jerry]

I really don't want my application to do a full page postback. Is AutoPostBack="true" the only solution?  Can't this be Ajax Enabled?  

[Plamen]

Hi Jerry,

You can try to add the RadDropDownTree  to the Ajax settings so it is Ajax Enabled and do not perform PostBack.

Hope this will be helpful.

Regards,
Plamen
Telerik