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How to persist state in treeview
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telaron
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telaron asked on 24 Mar 2010, 07:29 AM
Hi,

How do I persist state in treeview after redirect? For example if I expand "Parent A" Node then select "Child A.1" node where Child A.1 Node is a link. After I clicked on the link, the page is refreshed, the treeview however should persist its state.

Parent A
    Child A.1 (where Child A.1 = url(http://localhost/user/userid=1)
    Child A.2
Parent B
    Child B.1
    Child B.2

Can you please show me how to resolve the issue

thanks
 

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Alex Gyoshev
Telerik team
answered on 24 Mar 2010, 09:36 AM
Hi telaron,

I take it that the TreeView is in a master page? The node "Parent A" should call Expanded() like this:

    .Text("Parent A").Expanded(ViewContext.RouteData.Values["controller"].ToString() == "user")

Sincerely yours,
Alex Gyoshev
the Telerik team

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telaron
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answered on 25 Mar 2010, 04:52 AM
Hi Alex,

Thanks for the solution. Howerver, the solution you provided only work for 1 particular node, what if I have mutliple nodes expanded as shown below and when the page is refreshed I want the treeview to preserve the nodes that I expanded.  More specifically, if I expand Parent C, then expand Parent D and within Parent D I expand Child D2 and then Click on Child D2.1 where Child D2.1 is a link which causes the page to refresh.

Parent A
Parent B
Parent C
   Child C1
   Child C2
Parent D
   Child D1
   Child D2
      Child D2.1
      Child D2.2

So how do i preserve the state of the treeview after refresh

Thanks

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Alex Gyoshev
Telerik team
answered on 25 Mar 2010, 09:52 AM
Hello Nathan,

For more complex scenarios, such as yours, you have to maintain the TreeView state manually by attaching a JavaScript handler to the OnExpand / OnCollapse client-side events and populating a cookie. On page refresh, the cookie will be sent to the server and you can use it to load the state.

Kind regards,
Alex Gyoshev
the Telerik team

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telaron
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answered on 25 Mar 2010, 10:50 PM
hello Alex,

Any chance you can provide me with a working solution for my scenario?

thanks
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Alex Gyoshev
Telerik team
answered on 31 Mar 2010, 01:49 PM
Hello Nathan,

We thought that this would be a common scenario, so we promoted it to a KB article - persisting TreeView state in cookie. Let me know if you have any feedback.

All the best,
Alex Gyoshev
the Telerik team

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