jQuery jStorage Ajax Cache

controller.rb

# /
def index
  @last_news_id = News.last.id
  # another stuff here
end

# /last_news
def last_news
  @news = News.last(5).reverse
  render 'last_news.html', :layout => false
end

index.html.erb

# index.html.erb
# include jQuery, jStorage, ...
<script type="text/javascript">
  var lastNewsId = <%= @last_news_id %>;
  $(document).ready(
    function() {
      $.ajax({
        url: '/last_news',
        cacheJStorage: true,
        cacheKey: 'last_news_cache',
        isCacheValid : function(){
          var cachedId = $.jStorage.get('last_news_id', 0);
     
          return last_news_id == cachedId;
        },
          
        success: function(reply) {
          // You can now add your last news in the page
          $.jStorage.set('last_news_id', last_news_id);
        } 
      });
    }
  );
</script>