Dropping over a node with no children and LoadOnDemand=webservice

[JP]

Hi,

I noticed a strange behavior: when I drop a node onto another node which has no children and is loaded on demand by a webserivce, I will have the dropped node twice.

This is what I do
- expand node A by clicking the expand icon
- node A expands and has no children (using LoadOnDemand - webservice)
- I drag node B over node A
- The change of the parent is saved in database using a webservice
- After saving, I move node B client-side in javascript from the old parent to the new parent (node A)
- node B is visible under his new parent node A
- when I collapse node A and expand it again (by using the expand icon), I see the new node twice (the first was my moving in javascript the duplicate is fetched by webservice)

If node A would has at least one child when it is expanded the first time, everything is fine.
This only occurs if the new parent node had no children before the drag&drop operation.

How can I prevent that behavior?

Edit: What currently works for me is to clear the current node's children on the OnClientNodePopulatingHandler:

function OnClientNodePopulatingHandler(sender, e) {
   e.get_node().get_nodes().clear();
}

Is there a better way to achieve this?

[Plamen]

Hi Jp,

That is an interesting scenario indeed and it seems like a good work around. Could you please specify which web service demo exactly can be used to reproduce the issue and what is the exact javascript you are using so I could reproduce it and inspect it locally?

Greetings,
Plamen Zdravkov
the Telerik team