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RadTreeView PostBack Problem: User check some Nodes but on server nothing is checked

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Gregor Daskaloff
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Gregor Daskaloff asked on 31 Mar 2010, 03:07 PM
Hi,

I have the following problem: I have a form with a RadTreeView:


<telerik:RadTreeView ID="dataTree" runat="server" CheckBoxes="True" TriStateCheckBoxes="True" Width="100%" MultipleSelect="True" Height="300px"
</telerik:RadTreeView> 
 
... and CS source 
 
foreach (RadTreeNode node in this.dataTree.CheckedNodes) // Count = 0 after Postback! 
  ... 

The TreeView includes checkboxes for each node.
When the user selects a node and triggers a postback button, then on the server "CheckedNodes" property of the TreeView is empty (Count = 0).

Although ViewState is enabled globally and for the control is, the ViewState for the TreeView is not saved. For all other controls, however, it is saved.

What could be cause this problem? ViewState is enabled globally and there are no other scripts that affect the behavior.

My form is also identical with this ASP.NET example: http://demos.telerik.com/aspnet-ajax/treeview/examples/functionality/checkboxes/defaultcs.aspx
(Except for the Ajax Manager)

Thanks in advance.
Greeting
Gregor Daskaloff

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Veselin Vasilev
Telerik team
answered on 02 Apr 2010, 09:53 AM
Hi Gregor Daskaloff,

You attached a screenshot where all the nodes are unchecked. Are you sure you checked at least one node before the postback?

Best wishes,
Veskoni
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Gregor Daskaloff
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answered on 02 Apr 2010, 11:07 AM
Hi,

ok I have now found the error. I had forgotten to put "!IsPostBack" in the Page_Load event for the TreeView.

Now everything works.
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Gregor Daskaloff
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Veselin Vasilev
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Gregor Daskaloff
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