#103 Site Wide Announcements

最新推荐文章于 2024-10-19 14:39:46 发布

iteye_19623

最新推荐文章于 2024-10-19 14:39:46 发布

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分类专栏： Railscasts 文章标签： HTML

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本文介绍了一种在网站上展示并允许用户隐藏管理公告的方法。通过Rails框架实现，使用JavaScript进行动态交互，公告可在指定时间内显示，并提供链接让用户选择隐藏。

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.

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

<!-- 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>


# 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 > ? OR starts_at > ?", hide_time, 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"