Static & Async mixing JSON demo

This is a simple example - you could enhance it not to pollute the global namespace.
var stat =  [
    { attributes : { "id" : "node_1" }, data : "Node 1" },
    { attributes : { "id" : "node_2" }, data : "Node 2", state : "closed"},
    { attributes : { "id" : "node_3" }, data : "Node 3" }
];
$(function () { 
    $("#sa_json_1").tree({
        data : { 
            type : "json",
            async : true,
            opts : {
                async : true,
                method : "POST",
                url : "async_json_data.json"
            }
        },
        callback : { 
            // Make sure static is not used once the tree has loaded for the first time
            onload : function (t) { 
                t.settings.data.opts.static = false; 
            },
            // Take care of refresh calls - n will be false only when the whole tree is refreshed or loaded of the first time
            beforedata : function (n, t) { 
                if(n == false) t.settings.data.opts.static = stat; 
            }
        }
    });
});