Separators for Databound Items

[Mike]

Hello,

I want to bind a RadListBox to a list of a simple class:

Public Class ExampleInfo
    Property ID as integer
    Property Text as String
    Property Category as string
End Class

I would like to add separators to the list by category. Physically, that's easy - I just made the separator items disabled and applied a special css class. But, I am having trouble positioning them. Here's been my current approach:

Private _curCategory as string = ""
Private Sub mainList_ItemDataBound(sender As Object, e As Telerik.Web.UI.RadListBoxItemEventArgs)
        Dim dataRow As ExampleInfo = DirectCast(e.Item.DataItem, ExampleInfo)
        Dim LocalCategory as string  = dataRow.Category
        If _curCateogry <> LocalCategory Then
            Dim sepItem As New RadListBoxItem(LocalCategory, 0)
            sepItem.Enabled = False
            sepItem.CssClass = "listSeparator"
            sepItem.Attributes.Add("isSeparator", "True")
            mainList.Items.Add(sepItem)
        End If
        e.Item.Attributes.Add("isSeparator", "False")
        e.Item.ToolTip = dataRow.Description
End Sub

This adds the items just fine but, of course, they are added below the first item in the new category. I tried reordering them in the DataBound event for the list but I haven't been able to get that to work.

Can anybody help - how can I add separator items?

Thanks,

Mike

[Kate]

Hello Mike,

Try inserting the items instead of adding them  - mainList.Items.Insert(e.Item.Index,sepItem)  instead of the mainList.Items.Add(sepItem).

All the best,
Kate
the Telerik team

[Mike]

Hello,

That did it - thanks!

The only trouble is that adding the items messes up the indexes. So, transferring items at the end causes an error because it thinks their index doesn't exist. Also, when I transfer things back, I have to do a full rebind to get them to position correctly. I guess I'll just have to figure out a different way to do what I want until separators and grouping are fully supported.

Thanks,

Mike

[Kate]

Hello Mike,

After further testing the scenario with the custom separators I could not get any errors - transferring and reordering items works as expected from my side. Please check the attached page and let me know how it goes from your side.

Greetings,
Kate
the Telerik team