inline editing for select dropdown

I am implementing Datatable editor. i want to add select dropdown in table,as well as while adding new record also. i refer the example from given link but it is not working for me. only change is instead of ajax call,i am directly reading data from JavaScript variable.

Please refer the example on the given https://editor.datatables.net/examples/inline-editing/join.html

please suggest if any changes more required in given example