Check Parent has Child

[Allan]

Hi,

I need to known how can I check if parent node has a child.

Thanks,

Allan.

[Tsvetina]

Hello Allan,

You can check using the following code, assuming "item" is the current TreeListDataItem object you are checking:

if(item.ChildItems.Count>0)
{
    //code here
}

All the best,
Tsvetina
the Telerik team

[Allan]

Thanks Tsvetina, for ur fast reply!

But I still can't check those child.

How can I check it using the code above?

For Each TreeListItems As TreeListDataItem In RadTreeList1.Items

Next

[Princy]

Hello,

Try the following.
VB:

For Each item As TreeListDataItem In RadTreeList1.Items
    If item.ChildItems.Count > 0 Then
                 //your code
    End If
Next

Thanks,
Princy.

[Allan]

Thanks Princy,

I used your code, but still can't count the childitems.

It's show the error message : ChildItems is not a member of Telerik.Web.UI.TreelistDataItem

Can you help me?


Thanks,
Allan.

[Tsvetina]

Hi Allan,

It seems that you are using an older version of RadControls which does not expose this property yet. It would be best if you could upgrade to the latest version.
If this is not possible, you would need to loop through all visible TreeListDataItem objects and collect those which have a parent id corresponding to the id of the current item. Something like:

Protected Sub RadTreeList1_PreRender(sender As Object, e As EventArgs)
    Dim parent As TreeListDataItem = RadTreeList1.Items(0) //instead of this line, access the item you need to find the children of
    Dim id As String = parent.GetDataKeyValue("ID").ToString()
    Dim children As New TreeListDataItemCollection()
    For Each item As TreeListDataItem In RadTreeList1.Items
        If item.GetParentDataKeyValue("ParentID") IsNot Nothing AndAlso item.GetParentDataKeyValue("ParentID").ToString() = id Then
            children.Add(item)
        End If
    Next
'use children collection
End Sub

Greetings,
Tsvetina
the Telerik team