Jquery AutoComplete Load Problem

Question

Hi all;

Not Work

Jquery Code:

$('[id$=Name]').autocomplete('CallBack.aspx',{formatItem: function(item){return item.Name;}}).result(function(event, item) {
            location.href = item.AGE;
        });

Json:

var data = [{NAME:"John",AGE:"57"}];

---

Work

Jquery Code:

var data = [{NAME:"John",AGE:"57"}];

 $('[id$=Name]').autocomplete(data,{formatItem: function(item){return item.Name;}}).result(function(event, item) {
                location.href = item.AGE;
            });

Help me pls how its make ? callback.aspx return json not work