Accesing Client Object in User Control

[Peichung]

Hi,

I have a RadCombobox containing a RadTreeView ItemTemplate.  Everything works fine when I use it in a web page.  However, when I move it to a user control, I wasn't able to access to the TreeView client object anymore. Here is how I try to get checked tree nodes displayed in RadCombox's text:

 

    function OnDropDownClosed(sender, eventArgs)
    {
        var treeView = $find('<%# RadComboBox1.Items[0].FindControl("RadTreeView1").ClientID %>');
        var nodes = treeView.get_checkedNodes();

        var str = '';
        for (var i=0; i<nodes.length;i++)
        {
            str += ', ' + nodes[i].get_text();
        }
        sender.set_text(str);
    }

The error message I got was "'null' is null or not an object."  Please help.  Thanks,

Peichung

[Veselin Vasilev]

Hello Peichung,

This is because the ClientID of the combobox is not RadComboBox1 anymore.

You can try getting the treeview instance in this way:

var treeView = sender.get_items().getItem(0).findControl("RadTreeView1");

I hope this helps.

Regards,
Veselin Vasilev
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[Peichung]

Hi Veselin,

Thanks for the reply.  I tried that too, but it didn't work either.  I guess the name of the TreeView (i.e., RadTreeView1 in my case) has been changed in the user control scenario.  .NET added some prefix to uniquely identify the control.  I have no problem of getting the first item in the combobox like sender.get_items().getItem(0).  It is the findControl() method that throws the exception.  Is there any way that I can get the TreeView object without using its name?  Thanks,

Peichung

[Veselin Vasilev]

Hello Peichung,

I created a sample project and it worked just fine. Please download it and give it a try.

Let me know what should I do to reproduce the problem.

All the best,
Veselin Vasilev
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.