Question

may be you can help me. How can I create global object and function that return object values by id?

Example:

var chat = {
    data : {
      friends: {}
    }
}

....
/*
JSON DATA RETURNED:
{"users": [{"friend_id":"62","name":"name","username":"admin","thumb":"images/avatar/thumb_7d41870512afee28d91.jpg","status":"HI4","isonline":""},{"friend_id":"66","name":"Another name","username":"regi","thumb":"images/avatar/thumb_d3fcc14e41c3a77aa712ae54.jpg","status":"Всем привет!","isonline":"avtbsl0a6dcelkq2bd578u1qt6"},{"friend_id":"2679","name":"My name","username":"Another","thumb":"images/avatar/thumb_41effb41eb1f969230.jpg","status":"","isonline":""}]}
*/

onSuccess: function(f){
   chat.data.friends    = {};
   for(var i=0; i< f.users.length;i++){
      chat.data.friends.push(f.users[i])
   }
}

How can I create a new function (It will return values by friend_id)?

get_data_by_id: function (what, friend_id) {

/*obj.what = getfrom_globalobject(chat.data.friends???)*/
}

Example of use:

var friend_name     = get_data_by_id(name, 62);
var friend_username = get_data_by_id(username, 62);
var friend_avatar   = get_data_by_id(thumb, 62);

Answer 1

Try:

get_data_by_id: function (what, friend_id) {
   return chat.data.friends[friend_id][what];
}

… but use it like:

var friend_name     = get_data_by_id('name', 62);

…and set up the mapping with:

for(var i=0; i< f.users.length;i++){
  chat.data.friends[f.users[i].friend_id] = f.users[i];
}