Limit TreeView depth during drag and drop

[bman]

I have two TreeViews which have drag and drop enabled. I am trying to limit the depth when someone tries to drag a branch to the other tree.

Example:

TreeA (root)

  TreeA.1.0 (child; level 1)

    TreeA.1.1 (child; level 2)

 

TreeB (root)

  TreeB.1.0 (child; level 1)

    TreeB.1.1 (child; level 2)

 

Given the above two trees and I desire to only have nodes up to 3 levels deep (ie. no deeper than child level 2) If a user drags "TreeB.1.0" under "TreeA.1.1" then TreeA will have children 4 levels deep.

I see events Drag and Drop which allow me to validate the destination tree to prevent this. I tried to implement custom data elements as HtmlAttributes in my OnDemand TreeViewItemModel DataSource in server-side code:

TreeViewItemModel node = new TreeViewItemModel();

...

node.HtmlAttributes.Add(new KeyValuePair<string, string>("data_level", level.ToString()));

 

This

 

[Helen]

Hi Brian,

Did you review the  following blog post, which discusses a similar topic:

http://blog.falafel.com/restricting-drag-drop-levels-for-kendo-ui-treeview/

Regards,
Helen
Telerik