code: function() {
          removeElement(this.$(LOAD_MORE_SELECTOR));
          this.resultsContainer.innerHTML += this.selectivity.template('loading');
  
          this.options.query({
              callback: function(response) {
                  if (response && response.results) {
                      this._showResults(Selectivity.processItems(response.results), {
                          add: true,
                          hasMore: !!response.more
                      });
                  } else {
                      throw new Error('callback must be passed a response object');
                  }
              }.bind(this),
              error: this._showResults.bind(this, [], { add: true }),
              offset: this.results.length,
              selectivity: this.selectivity,
              term: this.term
          });
      }
docs: Loads a follow-up page with results after a search.
  
  This method should only be called after a call to search() when the callback has indicated
  more results are available.