[Solved] load-on-demand is not working when an item is selected

[Adam Plattner]

Our users reported a problem with radComboxI, and I tested it at

http://demos.telerik.com/aspnet-ajax/combobox/examples/populatingwithdata/autocompletesql/defaultcs.aspx site and found this unwanted behavior;

 

When an item is selected from combo box, the load-on-demand is disabled, meaning user can't select any other items, the current items are fixed. The count label shows "items 1-1 out of 1". It is not easy way to get back and select the other 91 items. The browser was IE 7.

 

Thanks

[Simon]

Hi Adam Plattner,

Thank you for reporting this issue.

I logged it in our bug-tracking system and updated your Telerik points for the report.

We will address the issue during the next week.

Greetings,
Simon
the Telerik team

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[Simon]

Hello Adam Plattner,

We resolved this issue, so please download tomorrow's Internal Build to obtain the fixed version.

Kind regards,
Simon
the Telerik team

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[Sharon Kalupske]

Hello,

We downloaded the 2009Q3 controls yesterday and are seeing the problem described above when using the new controls.  I was able to recreate the issue on the demo site referenced in the initial post (I used IE8).  Can you provide some insight?

Thanks for your help,
Sharon

[Sharon Kalupske]

The 2009Q3 combo box control's load on demand feature does not seem to be working.  The problem can be recreated on the following demo site link:  http://demos.telerik.com/aspnet-ajax/combobox/examples/populatingwithdata/autocompletesql/defaultcs.aspx.  Use the following steps to recreate the error:  1)  Select a value from the "Server Side" combo box.  2)  Press the "Select" button.  3)  Press the down arrow on the combo box.  4) Press the "Items" area in an attempt to view the other items.

This problem is stopping us from using the 2009Q3 controls.  We had hoped to use them to access some of the new features.  Can you provide a time line on when the problem will be corrected?

Thanks for your help,
Sharon

[Simon]

Hi Sharon Kalupske,

This happens because after clicking the Select button a postback occurs and in this case the ComboBox looses its Items loaded on demand. This looks strange in the demo because of the fact that the postback is ajaxified, which means that after the update the ComboBox will reflect its sever state, which is empty.

You could avoid this on your page by wrapping only the Button and the updated Label controls in one AjaxPanel. In this way, the ComboBox will retain its Items after the postback.

Regards,
Simon
the Telerik team

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[Adam Plattner]

May I ask what the change was? I reported the bug earlier and it was fixed. Now with the latest build it breaks again?

Why we have to change our codes and go around it? Please provide a working demo for your solution.

[Simon]

Hi Adam Plattner,

Actually now the demo is a bit misleading.

You can fix this by moving the RadComboBox outside the RadAjaxPanel, so that it is not updated. So, in the context of the live demo you can modify the layout as shown below:

<div class="module-row">
    <span class="text">Server-Side:</span>
    <telerik:RadComboBox ID="RadComboBox1" runat="server" Width="250px" Height="150px"
        EmptyMessage="Select a Company" EnableLoadOnDemand="True" ShowMoreResultsBox="true"
        EnableVirtualScrolling="true" OnItemsRequested="RadComboBox1_ItemsRequested">
    </telerik:RadComboBox>
</div>
<div class="module-row">
    <telerik:RadAjaxPanel runat="server" ID="RadAjaxPanel1">
        <asp:Button runat="server" Text="Select" ID="Button1" CssClass="qsfButtonBig" OnClick="Button1_Click">
        </asp:Button>
        <asp:Label CssClass="status-text" ID="Label1" runat="server"></asp:Label>
    </telerik:RadAjaxPanel>
</div>

Just to better understand why this happens, please remove the RAP and test again to see the actual behavior.

Greetings,
Simon
the Telerik team

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