Fabi755 ( Fabian Keunecke )

 sheet6 =   # nest further   |> Sheet.group_cols("C", "D") ++# Autofilter can be applied to allow filtering a range+sheet7 =+  %Sheet{+    name: "Autofilter columns",+    rows: [+      [1, 2, 3],+      [4, 5, 6],+      [7, 8, 9],+      [10, 11, 12],+      [13, 14, 15],+    ]+  }+  # first you select the filtering range

First of all, I would like to clear up a misconception. An autofilter does not apply to a single column, but a range. E.g. assume you have names, postal codes, and adresses in column A, B, and C respectively. Then a filtering based on say a postal code applies to all three columns, if they are all selected as the filtering range.

Next, to answer your question. In Excel if you create a filtering range without selecting any filter, you will see dropdown carets on each column in the filtering range (for selecting a filter obviously), but with no filter applied yet. No harm done, and it may actually be beneficial, as you might want to generate a worksheet with a filtering range but no filters applied as a convenience for your users.

Zinoex

comment created time in 5 days

Pull request review commentxou/elixlsx

Add autofilter

 defmodule Elixlsx.Sheet do   def remove_pane_freeze(sheet) do     %{sheet | pane_freeze: nil}   end+++  @spec set_autofilter(Sheet.t(), String.t(), String.t()) :: Sheet.t()+  @doc ~S"""+  Set the range for autofiltering+  """+  def set_autofilter(sheet, start_cell, end_cell) do+    {row1, col1} = Util.from_excel_coords(start_cell)+    {row2, col2} = Util.from_excel_coords(end_cell)+    set_autofilter(sheet, row1, col1, row2, col2)+  end++  @spec set_autofilter(Sheet.t(), number, number, number, number) :: Sheet.t()+  @doc ~S"""+  Set the range for autofiltering+  """+  def set_autofilter(sheet, row1, col1, row2, col2) do+    %{sheet | autofilter_ref: {row1, col1, row2, col2}}+  end+++  @spec append_list_filter(Sheet.t(), String.t(), list(any())) :: Sheet.t()+  @doc ~S"""+  Add filter on a column as a list of inclusive elements+  """+  def append_list_filter(sheet, column, filters) when is_binary(column) do+    append_list_filter(sheet, Util.decode_col(column), filters)+  end++  @spec append_list_filter(Sheet.t(), number, list(any())) :: Sheet.t()+  @doc ~S"""+  Add filter on a column as a list of inclusive elements+  """+  def append_list_filter(sheet, column, filters) do+    update_in(sheet.autofilter_cols, &Map.put(&1, column, {:list, filters}))+  end+++  @spec append_criteria_filter(Sheet.t(), String.t(), operator, any()) :: Sheet.t()+  @doc ~S"""+  Add filter on a column as an operator-based criteria

It is documented now.

Zinoex

comment created time in 5 days

Pull request review commentxou/elixlsx

Add autofilter

 defmodule Elixlsx.XMLTemplates do     end   end +  defp make_autofilter(nil, filter_cols) do+    ""+  end++  defp make_autofilter(autofilter_ref, filter_cols) do+    {row1, col1, row2, col2} = autofilter_ref++    """+      <autoFilter ref="#{Util.to_excel_coords(row1, col1)}:#{Util.to_excel_coords(row2, col2)}">+    """ <>+    make_filter_columns(autofilter_ref, filter_cols) <>+    """+      </autoFilter>+    """+  end++  defp make_filter_columns(autofilter_ref, filter_cols) do+    {_row1, col1, _row2, col2} = autofilter_ref++    Enum.map_join(filter_cols, fn col, {filter_type, filters} ->+      if col < col1 or col > col2 do+        # Filter column out of autofilter range+        ""+      else+        # Filter columns are relative to first column in the autofilter.+        make_filter_column(col - col1, filter_type, filters)+      end+    end)+  end++  defp make_filter_column(col_id, filter_type, filters) do+    """+    <filterColumn colId="#{col_id}">+    """ <>+    if filter_type == :list, do: make_filters(filters), else: make_custom_filters(filters) <>+    """+    </filterColumn>+    """+  end++  defp make_filters(filters) do+    non_blanks = Enum.reject(filters, fn filter -> filter != :blank end)++    blank = length(filters) != length(non_blanks)+    """+    <filters blank="#{blank}">+    """ <>+    Enum.map_join(non_blanks, &make_filter/1)+    """+    </filters>+    """+  end++  defp make_filter({%DateTime{year: year, month: month, day: day, hour: hour, minute: minute, second: second} = date, grouping}) do+    """+    <dateGroupItem year="#{year}" month="#{month}" day="#{day}" hour="#{hour}" minute="#{minute}" second="#{second}" dateTimeGrouping="#{grouping}"/>+    """+  end++  defp make_filter(val) do+    "<filter val=\"#{val}\"/>"+  end++  def make_custom_filters(expr) do