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[Solved] First time hierarchy-expand with OnRequestStart

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Grid

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Daniel Lang asked on 24 Feb 2010, 01:20 AM

Dear All!

I'm encountering a really strange behaviour:
I have a RadGrid on my page, which displays a two-level hierarchy. OnNeedDataSource and DetailTableDataBind - events are used for assigning data to the grids. Additionally there is an AjaxManager, which updates the grid itself and a further dependent RadGrid (unimportant). HierarchyLoadMode is set to "ServerOnDemand". Data insertion/deletion/updating is done with the default in-line editors (server-side events aren't implemented yet). So far, nothing special at all...

Everything worked fine, until I added export-buttons into the command-item. I have read the documentation carefully and therefor added the javascript-method to un-ajaxify the 3 export-buttons.

Here is the code:

    
                <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server"> 
        
                    <script type="text/javascript"> 
        
                        function mngRequestStarted(ajaxManager, eventArgs) { 
        
                            if (eventArgs.get_eventTarget().indexOf("btnExportToPDF") != -1) 
        
                                eventArgs.set_enableAjax(false); 
        
                            if (eventArgs.get_eventTarget().indexOf("btnExportToExcel") != -1) 
        
                                eventArgs.set_enableAjax(false); 
        
                            if (eventArgs.get_eventTarget().indexOf("btnExportToCSV") != -1) 
        
                                eventArgs.set_enableAjax(false); 
        
                        } 
        
                    </script> 
        
                </telerik:RadCodeBlock>

This client-side function is registered like the following:

    
                <telerik:RadAjaxManager runat="server" EnablePageHeadUpdate="False" ClientEvents-OnRequestStart="mngRequestStarted"> 
        
                    <AjaxSettings> 
        
                        <telerik:AjaxSetting AjaxControlID="gridTasks"> 
        
                            <UpdatedControls> 
        
                                <telerik:AjaxUpdatedControl ControlID="gridTasks"/> 
        
                            </UpdatedControls> 
        
                        </telerik:AjaxSetting> 
        
                        <telerik:AjaxSetting AjaxControlID="gridTasks" EventName="OnSelectedIndexChanged"> 
        
                            <UpdatedControls> 
        
                                <telerik:AjaxUpdatedControl ControlID="lblNoSelectionText" /> 
        
                                <telerik:AjaxUpdatedControl ControlID="pnlTimeEntryPanel"/> 
        
                            </UpdatedControls> 
        
                        </telerik:AjaxSetting> 
        
                        <telerik:AjaxSetting AjaxControlID="chkShowProj... 
        
             ### further code ###

The problem:
If I open up the page in a web-browser and want to expand any record immediately, it doesn't work as long as I don't click a second record, or do anything which triggers an ajax-request!
For example: Before I can expand any record, I could click on it, so that there is a SelectionChangedEvent being raised (ajax-request is ok) and after that everything is normal.

My solution-attempt:
If I remove the "ClientEvents-OnRequestStart" - from the AjaxManager-definition everything is ok. Therefor I believe it must have something to do with the initial registration of the javascript-functions which make a record expand or collapse.

Any help or tips appreciated!

Best regards,
Daniel Lang

2 Answers, 1 is accepted

answered on 24 Feb 2010, 02:40 PM

In the meantime I can guerantee, that the javascript-function "mnqRequestStart" is executed correctly on every "expand"-event. I tested it with FireBug. Further I know, that also the ajax-request to the server is happening and served correctly (debugging the needdatasource and itembound - methods with visual studio). Therefor I assume that this is a bug which has something to do with the RadGrid not being updated client-side in some cases when using the ClientEvents-OnRequestStart.

BTW: I switched to HierarchyLoadMode="Client" and now everything is working again. However, I think this bug should be fixable.