OnNodeClick event

[Yanling]

Hi Telerik,

I have a radtreeview which is dynamically binded to database. Following is the table structure:

AreaId | ParentAreaId | AreaName | IsRoomLevel | IsExpanded

1. When the treeview is generated, I want to assignment the "OnNodeClick" event only to the nodes whose attribute IsRoomLevel = 'True', i.e. not all the nodes can trigger the OnNodeClick event. How to achieve this?

2. When the "OnNodeClick" event is on, the nodes cannot be double clicked to expand or shrink because the page will refresh when the node is clicked.

3. I want to save the status of the treeview, i.e. the expend status of each node. But it is not efficient if I save the status of all the nodes to the database every time the their status are changed.

Any suggestions for these three questions? Thanks!

Best regards,
Hank

[Veselin Vasilev]

Hello Yanling,

Here are the answers to your questions:

1. You need to subscribe the whole treeview to the NodeClick server-side event. Then you need to subscribe to the OnClientNodeClicking client-side event and cancel it if the "IsRoomLevel" attribute of the node is not true.

2. In the NodeClick event handler you can change the Expanded state of the clicked node:

e.Node.Expanded = !e.Node.Expanded;

3. You can save the status of the expanded nodes on postback and not on every client expand / collapse.
You can use the GetXml() method of the treeview for that.

I hope this helps.

Sincerely yours,
Veselin Vasilev
the Telerik team

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[adnan]

Ok i am having a similar problem but my scenario is different

i have three hierarchies

H1, H2, H3
what i want is when i click on H1 i will redirect to page 1
when i click on H2 i will redirect to page 2
when i click on H3 i will redirect to page 3

so how can i see i which hierarchy i am in so that i can call the right redirect method?

[Nikolay Tsenkov]

Hi adnan,

First, you can not have different dataSources for one instance of the TreeView, if you do - you need to either:
1. Join them (if is a SQL data source make a SQL JOIN for example);
2. Create custom data binding method that should load the data from different sources and create nodes accordingly.

Then, you can handle the NodeDataBound event and there to apply the appropriate NavigateUrl.

Hope this is going to help you!


Regards,
Nikolay Tsenkov
the Telerik team