in which call back function should we call another AJAX call in jquery autocomplete

 $("#company").autocomplete({
    source: function( request, response ) {
       $.ajax({
          url: "findByCompanyName",
          data: {"company": request.term},
          dataType: "json",
          success: function( data ) {
              response( $.map( data, function( item ) {
                 return {
                    label: item.company,
                    value: item.company,
                    companyid: item.companyId
                 }
              }));
          }
       });
    },
    minLength: 1,
    select: function(event, ui) {
        $('#eventCompany').val(ui.item.company);
        $('#companyName').val(ui.item.company);
        $('#companyId').val(ui.item.companyId);
    }
});

Copyright Notice：Content Author:「user739115」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/30770068/in-which-call-back-function-should-we-call-another-ajax-call-in-jquery-autocompl