Hello,

I have a Hierarchical Data Source and work fine for display in ListView.

I can also CRUD the root level without problem. However, I could not update the second level (node.children).

No mater tried node.children.sync(), or even the top <Hierarchical Data Source>.sync(), the update function of transport had not been triggered. 

I tried modify a child record: node.children.at(0).set('newKey', 'newValue'). node.children.hasChanges() retuned True. After node.children.sync(), node.children.hasChanges() retuned False. But Transport.update had not been triggered so that nothing was written into datasource.

Any idea?

Hello Bassanio,

See this jsBin sample for a simple example how to sync the TreeView upon editing. An important thing to note is that nodes need to have IDs in order for the update / destroy operations to work (items without IDs are considered as not synchronized). Thus, the create action needs to return the ID upon successful creation of items.

Regards,
Alex Gyoshev
Telerik