Redmine

    <% if query.grouped? %>

      <tr class="group open">

        <th colspan="<%= query.inline_columns.count + 2 %>" class="group_label">

          <span class="expander icon icon-expended" onclick="toggleAllGroupedIssues(this);">&nbsp;</span>

          <span class="name"><%= l(:field_group_by) %>: <%= query.group_by_column.caption %></span>

          <%= link_to_function("#{l(:button_collapse_all)}/#{l(:button_expand_all)}",

                               "toggleAllRowGroups(this)", :class => 'toggle-all') %>

        </th>

      </tr>

    <% end %>

<%= javascript_tag do %>

function toggleAllGroupedIssues(el){

  var tr = $(el).parents('tr').first();

  tr.toggleClass('open');

  tr.find('.expander').toggleClass('icon-expended icon-collapsed');

  var td_tr = $(el).parents('table').children('tbody').children('tr').first();

  if (tr.hasClass('open')) {

    expandAllRowGroups(td_tr);

  } else {

    collapseAllRowGroups(td_tr);

  }

}

<% end %>

table.list th.group_label { text-align: left }