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Ajax manager issues - button disappears and 'a is undefined'
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Iggy
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Iggy asked on 31 Mar 2010, 03:43 PM

I am using a RadWindow to show a wizard style dialog.  On the page I have a RadMultiPage and on each pageview I have the controls  and navigation buttons.

The first pageview contains two RadListBoxes.  The first one has autopostback set to true and on the Check event I populate the second listbox.  I have these ajaxified as follows:

<telerik:AjaxSetting AjaxControlID="rlbList1">  
    <UpdatedControls> 
        <telerik:AjaxUpdatedControl ControlID="rlbList1" /> 
        <telerik:AjaxUpdatedControl ControlID="rlbList2" /> 
        <telerik:AjaxUpdatedControl ControlID="lblErrorText" /> 
    </UpdatedControls> 
</telerik:AjaxSetting> 

This works fine, when I click an item in the first list the second list is updated correctly through the callback.

The issues come in when I press the "Next" button on this pageview.  I have it ajaxified as follows:
<telerik:AjaxSetting AjaxControlID="btnNext">  
    <UpdatedControls> 
        <telerik:AjaxUpdatedControl ControlID="btnNext" LoadingPanelID="rlpDisable" /> 
        <telerik:AjaxUpdatedControl ControlID="btnCancel" LoadingPanelID="rlpDisable" /> 
        <telerik:AjaxUpdatedControl ControlID="rlbList1" /> 
        <telerik:AjaxUpdatedControl ControlID="rlbList2" />                          
        <telerik:AjaxUpdatedControl ControlID="rmpMain" /> 
        <telerik:AjaxUpdatedControl ControlID="lblPage1ErrorText" /> 
        <telerik:AjaxUpdatedControl ControlID="lblPage2ErrorText" /> 
    </UpdatedControls> 
</telerik:AjaxSetting> 


This is the code I have in the Next click event method, Page_Load and Init only have code that runs on the initial load.

if (rlbList2.CheckedItems.Count == 0)  
{  
    lblErrorText.Text = "At least one item must be selected.";  
}  
else 
{  
    //Populate items on the second page using selected items on first page  
    _PopulateListOnPage2(rlbList2.CheckedItems.Select(p => p.Value).ToArray());  
    rmpMain.SelectedIndex = 1;  


This causes two "a is undefined" errors in javascript.  If I remove the rlbList# controls from the ajax this stops the javascript errors. 

The other issue is that if an error occurrs and I don't change the mulpage selectedindex, then the buttons disappear.  I've tried it without the loading panel showing over the buttons and the same thing occurs.  Also, if I leave the listboxes in the updated controls collection these will also disappear if the selected pageview doesn't change (I receive the 'a is undefined' errors though). 

But if I switch to the next pageview and come back to this one then everything shows correctly. 

If I remove the Ajax manager then everything works correctly through the postbacks.  So to get around this I removed the Ajax manager and wrapped the MultipPage with a RadAjaxPanel and now everything seems to work correctly.  I would rather not do this though because the loading panel shows over the whole ajax panel control instead of just the controls I want to disable.  Is there something I'm missing with how the ajax manager works with the RadMultiPage or why would my controls be disappearing?


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Yavor
Telerik team
answered on 06 Apr 2010, 11:21 AM
Hello Iggy,

I reviewed the code snippets, and they look correct.
If the issues persist, you can open a formal support ticket, and send us a small project, demonstrating your setup, for additional review and testing.

Kind regards,
Yavor
the Telerik team

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Iggy
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