Good Day! guys

Example .....  display_total_amount = pos.pos_session.total_amount;

like this . where can i open the pos.session env in my jscript..

document.getElementById('stotal').value = this.pos.pos_session.total_amount;

or how can i extend this what is standard format..

{
                model:  'pos.session',
                fields: ['id', 'total_amount','order_qty','journal_ids','name','user_id','config_id','start_at','stop_at','sequence_number','login_number'],
                domain: function(self){ return [['state','=','opened'],['user_id','=',self.session.uid]]; },
                loaded: function(self,pos_sessions){
                    self.pos_session = pos_sessions[0];

                    var orders = self.db.get_orders();
                    for (var i = 0; i < orders.length; i++) {
                        self.pos_session.sequence_number = Math.max(self.pos_session.sequence_number, orders[i].data.sequence_number+1);

                    }
                },
            },

but i can't get the value of data in the database.

any help and advise. thanks :)