code: function(searchInput) {
      // Set input value to passed value and clear everything else.
      this._inputEl.value = searchInput;
      this._typeahead.selected = null;
      this._typeahead.clear();
      this._onChange();
      return this;
    }
docs: Set input
  @param {string} searchInput location name or other search input
  @returns {MapboxGeocoder} this