Jstree with json data type

i have used jstree to populate a tree view using json object . my json object is 开发者_Go百科something like this :-

[
 {
  "attr" : { "id" : "li.node.id" ,"rel" : "root"},
  "data":"3-Test Group3","state": "open",
  "children":["4-testing4"]
 },
 {
  "attr" : { "id" : "li.node.id" ,"rel" : "root"},
  "data":"2-Test Group2","state": "open",
  "children":["4-testing4"]
 }
]

This populates a tree but when i used cookie plugin to reselect the selected value i found that child nodes don't have id due to which the plugin does not work.

Can anyone help me how to provide id in child node??

Thanks in advance

---

how about:

{
"attr" : { "id" : "li.node.id" ,"rel" : "root"},
"data":"3-Test Group3","state": "open",
"children":[ { "data" : "4-testing4", "id" : "some_id" } ]
},