code: function () {
              var possibleVals = result(this, 'possibleVals');
              var id = this.inputId;
              var $select = Backbone.$('<' + this.elementType + '>')
                      .attr(extend((this.addId ? { id: id, name: id } : {}), this.inputAttrs));
  
              this.getInputWrapper().html($select);
              if (this.multiple) { $select.attr('multiple', 'multiple'); }
              if (this.inputClass) { $select.addClass(this.inputClass); }
              if (this.placeholder) {
                  $select.append('<option value="">' + this.placeholder + '</option>');
              }
              return this._renderInput($select, possibleVals);
          }
docs: Renders the select element and the options
  @memberOf Backbone.fields.SelectListView#
  @return {Backbone.fields.SelectListView}