code: function (grid, state) {
          var filters = {};
          this.filters.each(function (filter) {
              if (filter.active) {
                  filters[filter.dataIndex] = filter.getValue();
              }
          });
          return (state.filters = filters);
      }
docs: Saves the state of all active filters
  @param {Object} grid
  @param {Object} state
  @return {Boolean}