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Site Wide Announcements

Category: Ruby on Rails | Tags: ruby rails javascript plugin railscast 0 Comments

railscasts.com — Sometimes you need to display an administrative announcement to every page on the site and give the users the ability to hide the announcement. See how in this episode. Yet another great railscast. Follow the link and make sure to have a look at our content page for an alternative way to do it.

  Posted by aroedl 8 months ago
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This is how he did it:

Generators

  script/generate scaffold announcement message:text starts_at:datetime ends_at:datetime
  script/generate controller javascripts

View

  <!-- layouts/application.html.erb -->
  <% unless current_announcements.empty? %>
  <div id="announcement">
    <% for announcement in current_announcements %>
      <p><%=h announcement.message %></p>
    <% end %>
    <p><%= link_to_remote "Hide this message", :url => "/javascripts/hide_announcement.js" %></p>
  </div>
  <% end %>

Model/Helper/Controller/RJS/Route

  # models/announcement.rb
  def self.current_announcements(hide_time)
    with_scope :find => { :conditions => "starts_at <= now() AND ends_at >= now()" } do
      if hide_time.nil?
        find(:all)
      else
        find(:all, :conditions => ["updated_at > ?", hide_time])
      end
    end
  end

  # application_helper.rb
  def current_announcements
    @current_announcements ||= Announcement.current_announcements(session[:announcement_hide_time])
  end

  # javascripts_controller.rb
  def hide_announcement
    session[:announcement_hide_time] = Time.now
  end

  # hide_announcement.js.rjs
  page[:announcement].hide

  # routes.rb
  map.connect ":controller/:action.:format" 

This is how you could do it

Plugin installation

  script/plugin install http://pmade.com/svn/oss/stickies/trunk

Somewhere in your application layout:

  <%= render_stickies %>

Application controller

  notice_stickie("This is an announcement!")

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