This sample demonstrates ordering fields in row and column axes either in ascending or descending order.
In this sample, any field can be selected from the
                         Fields dropdown list and its order can be changed to display headers either in ascending or descending order.
                                        It can be enabled using the
                         enableSorting property and it can be configured using the
                         name and
                         order options inside the
                         sortSettings property in the pivot table.
                    
More information on the sorting can be found in this documentation section.