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Expand specific items in load-on-demand treeview

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Jason Tung
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Jason Tung asked on 17 Mar 2010, 02:57 AM
I have a load-on-demand treeview (such as the treeView-LoadOnDemand-Example), and I want to automatically  expand some items when loading the tree:
+ item1
     - item1.1
     - item1.2
+ item2
- item3
    - item3.1
        - item 3.1.1
        - item 3.1.2
  - item3.2
  - item3.3
+ item4
 + item5  
 + item6

how can i do it?  thanks

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Jason Tung
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answered on 18 Mar 2010, 04:10 AM
cannot attach zip files.
For example, In the treeview-loadondemanditemlevels exapmle given by the administrator, I want to expand node:
          Bevareges->chang
and    Condiments-->Aniseed Syrup

thanks
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Tina Stancheva
Telerik team
answered on 22 Mar 2010, 01:32 PM
Hello Jason Tung,

In your case you can use ContainerBindings and bind the IsExpanded property of your items to an IsExpanded property of the business object displayed by the RadTreeViewItem.

Then, while you are loading the products for the selected category,  you can check if the IsExpanded property of the product is set to True and if it is you can load the OrderDetail info for this product.

I have prepared a simple example demonstrating how you can accomplish this. Please take a look at it and let me know if it works for you or if I can help you further.

All the best,
Tina Stancheva
the Telerik team

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Jason Tung
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Answers by
Jason Tung
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Tina Stancheva
Telerik team
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