The OnClientNodeEdited event occurs when a node has been edited by the end user. It is not possible to cancel the serverside postback from OnClientNodeEdited event. The OnClientNodeEditing
event occurs after the user has finished editing but before the OnClientNodeEdited event. If you want to cancel the postback you can cancel that from OnClientNodeEditing
event as I suggested above. Please take a look into the following documentations for more information.
Please elaborate your scenario if it doesn't help so that I can suggest a way.