Dropdown call

dropdown population

    var years = [];
    //use for dropdown
    var epicorData = $.ajax({
      url: "js/Sears_MkMdlBodyDoor_20120515.json",
      dataType: "json",
      success: function (incomingYears){
        years = incomingYears;

        selects = [
          $("select#wfVehEnterMake"),  // selects[0]
          $("select#wfVehEnterModel"), // selects[1]
          $("select#wfVehEnterTrim"),  // selects[2]
          $("select#wfVehEnterDoors")  // selects[3]
        ]        

        enterYear = $('#wfVehEnterYear');
        enterMake = $('#wfVehEnterMake');
        enterModel = $('#wfVehEnterModel');
        enterTrim = $('#wfVehEnterTrim');
        enterDoors = $('#wfVehEnterDoors');
      
        var selectedYear = years[0]

        for(var year in years) {
          $('<option>').val(year).text(year).appendTo(enterYear);
        }

        setMakesForSelectedYear = function() {
          enterMake.empty();
          $('<option>').val(0).text("Choose a Make").appendTo(enterMake);
          for(var make in years[selectedYear]) {
            $('<option>').val(make).text(make).appendTo(enterMake);
          }
        }

        setModelsForSelectedMake = function() {
          enterModel.empty();
          $('<option>').val(0).text("Choose a Model").appendTo(enterModel);
          for (var model in years[selectedYear][selectedMake]) {
            $('<option>').val(model).text(model).appendTo(enterModel);
          }
        }

        setTrimForSelectedMake = function() {
          enterTrim.empty();
          $('<option>').val(0).text("Choose a Body Style").appendTo(enterTrim);
          for (var modelDetails in years[selectedYear][selectedMake][selectedModel])
            {var epiTrim = years[selectedYear][selectedMake][selectedModel][modelDetails].bodyStyle
              if (epiTrim === "undefined" || epiTrim === "")
              {
                 enterTrim.remove();//doesnt resolve Object has no method to appendTo
              }
              else 
              {
                $('<option>').val(epiTrim).text(epiTrim).appendTo(enterTrim);
              }               
            }
          }

        setDoorsForSelectedMake = function() {
          enterDoors.empty();
          // var deDupeDoors = enterDoors.find('option').get();
          //     deDupeDoors = $.unique(deDupeDoors);
          $('<option>').val(0).text("Select Number of Doors").appendTo(enterDoors);
          for (var modelDetails in years[selectedYear][selectedMake][selectedModel])
            {var epiDoors = years[selectedYear][selectedMake][selectedModel][modelDetails].numDoors
              if (epiDoors === "undefined" || epiDoors === "")
              {
                enterDoors.remove();//doesnt resolve Object has no method to appendTo
              }
              else 
              {
                $('<option>').val(epiDoors).text(epiDoors).appendTo(enterDoors);                
              }                 
            }
          }

        enterYear.change(function(){
          $.each(selects, function(index, select) { select.empty() });

          selectedYear = $(this).find('option:selected').val();
          setMakesForSelectedYear();

          enterMake.show('fast', hideLoadingGif);
        });

        enterMake.change(function(){
          $.each(selects.slice(1), function(index, select) { select.empty() });

          selectedMake = $(this).find('option:selected').val();
          setModelsForSelectedMake();

          enterModel.show('fast', hideLoadingGif);
        });

        enterModel.change(function(){
          $.each(selects.slice(2), function(index, select) { select.empty() });

          selectedModel = $(this).find('option:selected').val();
          setTrimForSelectedMake();

          enterTrim.show('fast', hideLoadingGif);
        });
        enterTrim.change(function(){
          $.each(selects.slice(3), function(index, select) { select.empty() });

          modelDetails = $(this).find('option:selected').val();
          setDoorsForSelectedMake();

          enterDoors.show('fast', hideLoadingGif);
        });
        // showLoadingGif();
      }
    });