code: function() {
  
              var val=[], self=this;
  
              // show search and move it to the end of the list
              this.searchContainer.show();
              // make sure the search container is the last item in the list
              this.searchContainer.appendTo(this.searchContainer.parent());
              // since we collapsed the width in dragStarted, we resize it here
              this.resizeSearch();
  
              // update selection
              this.selection.find(".select2-search-choice").each(function() {
                  val.push(self.opts.id($(this).data("select2-data")));
              });
              this.setVal(val);
              this.triggerChange();
          }
docs: multi