orbit-basic/app/views/admin/users/_form.html.erb

<div id="select_user_roles">
  <% @user_role_models.each do |ua| %>
    <%= check_box_tag "user[active_roles][]", ua.key, (@user.active_roles.include?(ua.key) rescue false) %> <%= ua.i18n_variable[locale] %>
  <% end -%>
  <%= hidden_field_tag 'user[active_roles][]', '' %>
</div>

<div>
  <label><%= t('admin.my_avatar') %></label>
  <%= image_tag(@user.avatar.thumb.url) if @user.avatar? %>
  <%= file_field_tag 'file' %>
  <%= hidden_field_tag :avatar_cache %>
</div>

<div>
  <p>
    <%= f.label :email %>
    <%= f.text_field :email %>
  </p>
  <p>
    <%= t('admin.admin') %>
    <%= f.check_box :admin %>
  </p>
</div>

<% if @user_info_models %>
  <fieldset>
  <legend><%= t('admin.info') %></legend>
    <% @user_info_models.each do |ua| %>
      <fieldset>
        <%= render :partial => 'user_attribute',
          :object => (@user.user_infos.detect {|u| u.key == ua.key } || @user.user_infos.build),
          :locals => {:ua => ua, :type => 'info'} %>
      </fieldset>
    <% end -%>
  </fieldset>
<% end %>

<% if @user_role_models %>
  <fieldset id="roles" <%= raw(' style="display: none;"') unless (@user.active_roles.size > 0 rescue nil) %>>
  <legend><%= t('admin.roles') %></legend>
    <% @user_role_models.each do |ua| %>
      <fieldset id="role_<%= ua.key %>" <%= raw(' style="display: none;"') unless (@user.active_roles.include?(ua.key) rescue nil) %>>
        <%= render :partial => 'user_attribute',
          :object => (@user.user_roles.detect {|u| u.key == ua.key } || @user.user_roles.build),
          :locals => {:ua => ua, :type => 'role'} %>
      </fieldset>
    <% end -%>
  </fieldset>
<% end %>

<% content_for :page_specific_javascript do %>
<script type="text/javascript" charset="utf-8">
    $(document).ready(function(){
        $('#select_user_roles input').click(function(){
            $('#role_'+this.value).toggle();
            if($("#select_user_roles input:checked").length > 0)
              { $('#roles').show(); }
            else
              { $('#roles').hide(); }
        });
    });
</script>
<% end -%>