code: function() {
    if (this.config.searchable || this.config.taggable) {
      this.input.value = null;
      this.searching = false;
      if (this.config.searchable) {
        util.removeClass(this.inputContainer, "active");
      }
  
      if (util.hasClass(this.container, "notice")) {
        util.removeClass(this.container, "notice");
        util.addClass(this.container, "open");
        this.input.focus();
      }
  
      util.each(this.items, function(i, item) {
        // Items that didn't match need the class
        // removing to make them visible again
        util.removeClass(item, "excluded");
        // Remove the span element for underlining matched items
        if (!this.customOption) {
          item.innerHTML = item.textContent;
        }
      }, this);
    }
  }
docs: Clear a search
  @return {void}