RadTreeview save expanded state without session object

[Ramakrishna]

I have a RadTree controls in a single page divided by tabs, 1st tab two radtrees, 2nd tab three, 3rd tab   three.
Child nodes are expanding LoadOnDemand event.

I gonna maintain Tree view state(without session) though user refresh the page. If user expands parent node and press F5 button we have to show expanded nodes as it is. 

Private Shared dictOriginTree As New Dictionary(Of String, Boolean)

Protected Sub rtvOriginTree_NodeExpand(sender As Object, e As RadTreeNodeEventArgs)        
        If Not dictOriginTree.ContainsKey(e.Node.UniqueID) Then
            dictOriginTree.Add(e.Node.UniqueID, e.Node.Expanded)
        End If
    End Sub

Protected Sub ramMasterDocumentsAjaxManager_AjaxRequest(ByVal sender As Object, ByVal e As Telerik.Web.UI.AjaxRequestEventArgs)
Dim node As RadTreeNode
                For Each node In rtvOriginTree.GetAllNodes()
                    If dictOriginTree.ContainsKey(node.UniqueID) Then
                        node.ExpandParentNodes()
                        node.ExpandChildNodes()
                        node.Expanded = dictOriginTree.Item(node.UniqueID.ToString())
                        node.ExpandMode = TreeNodeExpandMode.ServerSide
                    End If
                Next
End Sub

[Ramakrishna]

Still waiting for reply...

RadTree - ExpandChildNodes() function doesn't work ?

[Hristo Valyavicharski]

Hi Ramakrishna,

I have replied to your question in this forum post: http://www.telerik.com/forums/radtreeview-save-expanded-state#JMXlJa0_2068gUaNW-7sEg

Regards,
Hristo Valyavicharski
Telerik

 

 

[Ramakrishna]

Hi Hristo,
Thank you very much for your reply.I gone through the Demo and saw the code but in the code Session object being used. My questions are
1) Is it possible without using Session
2) In my case i have total of 7 RadTreeView controls in a single page. So i should use 7 different Session objects ? Absolutely it will hit the performance.

 I will attach screen shots.

    Protected Sub SaveButton_Click(sender As Object, e As EventArgs)
        Session("CustomPersistenceSettingsKey") = Me.Session.SessionID
        Dim fileId As String = Session("CustomPersistenceSettingsKey").ToString()
        LoadButton.Enabled = True
        RadPersistenceManager1.StorageProviderKey = fileId
        RadPersistenceManager1.SaveState()
    End Sub

[Hristo Valyavicharski]

Hi Ramakrishna,

The session object is used only for the purpose of the demo. The RadPersistenceFramework stores its data in a xml file. In your scenario you could set the CustomPersistenceSettingsKey to be the UserID (value retrieved from the DB). Or you can use Cookies instead of Session.

Regards,
Hristo Valyavicharski
Telerik

 

 

[Ramakrishna]

 Hi Hristo,
I tried several options but it didn't work. here is the code, could you help me out.
aspx code:
--------------
<telerik:RadPersistenceManager runat="server" ID="RadPersistenceManager1">
            <PersistenceSettings>
                <telerik:PersistenceSetting ControlID="rtvOriginTree" />
            </PersistenceSettings>
 </telerik:RadPersistenceManager>
 <telerik:RadTreeView ID="rtvOriginTree" runat="server" DataFieldID="ID" EnableDragAndDrop="true" OnNodeExpand="rtvOriginTree_NodeExpand"
           DataFieldParentID="ParentID" DataTextField="NodeText" DataValueField="ID" OnClientContextMenuShowing="onClientContextMenuShowing"
           OnClientContextMenuItemClicked="OnClientContextMenuItemClicked_P1" OnClientNodeClicking="ClientNodeClicking_OD"
           OnSaveCustomSettings="rtvOriginTree_SaveCustomSettings" OnLoadCustomSettings="rtvOriginTree_LoadCustomSettings"
           Skin="Windows7" Style="white-space: normal;" ShowLineImages="false">
</telerik:RadTreeView>

VB Code:
--------


Protected Sub rtvOriginTree_SaveCustomSettings(sender As Object, e As Telerik.Web.UI.PersistenceManagerSaveStateEventArgs)
        e.CustomSettings.Add(New Telerik.Web.UI.ControlSetting() With { _
            .Name = "pos", _
            .Value = wndStateHolder.Value _
        })
End Sub

Protected Sub rtvOriginTree_NodeExpand(sender As Object, e As RadTreeNodeEventArgs)        
        RadPersistenceManager1.StorageProviderKey = CurrentSession.UserId.ToString()
        RadPersistenceManager1.SaveState()
    End Sub

[Hristo Valyavicharski]

Ramakrishna,

What happened? Do you see the generated file in the App_Data folder? Does it contain any data? How do you restore saved data? 

Regards,
Hristo Valyavicharski
Telerik

 

 

[Ramakrishna]

yup, i could see a file in App_Data. but not sure how to restore data.
<?xml version="1.0"?>
<ArrayOfRadControlState xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <RadControlState>
    <ControlSettings />
    <UniqueId>Telerik.Web.UI_PersistanceManager_CustomSettings</UniqueId>
  </RadControlState>
  <RadControlState>
    <ControlSettings>
      <ControlSetting>
        <Name>CheckedIndices</Name>
        <Value Type="System.Collections.Generic.List`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]">
          <ArrayOfString />
        </Value>
      </ControlSetting>
      <ControlSetting>
        <Name>ExpandedIndices</Name>
        <Value Type="System.Collections.Generic.List`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]">
          <ArrayOfString>
            <string>0</string>
            <string>0:1</string>
          </ArrayOfString>
        </Value>
      </ControlSetting>
      <ControlSetting>
        <Name>SelectedIndices</Name>
        <Value Type="System.Collections.Generic.List`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]">
          <ArrayOfString>
            <string>0:2</string>
          </ArrayOfString>
        </Value>
      </ControlSetting>
    </ControlSettings>
    <UniqueId>ctl00$BodyContentPlaceholder$rtvOriginTree</UniqueId>
  </RadControlState>
</ArrayOfRadControlState>

[Hristo Valyavicharski]

Ramakrishna,

In order to preserved selected nodes, you will have to store and restore saved data. For additional information please look at these links:

• Load Custom Settings
• Save Custom Settings

I hope this helps.

Regards,
Hristo Valyavicharski
Telerik