Rails - Nov 2010 - How to get the :remote => true working to update a part of the page?

In Rails 2, I used this kind of code to get a certain part of the page
to update.

<!-- section/show-->
<% if @section.has_sidebar %>
	<div id=''sidebar_div'' class=''span-3''>
		<ul class=''sidebar_list''>
		<% for page in @section.pages %>
			<li><%= link_to_remote "#{page.name}",
:update=>''show_page'', :url
=>
{
:controller=>''pages'',:action=>''show_page'',
:id=>page.id }, :html=>{}
%></li>
			<hr/>
		<% end %>
		</ul>
	</div>
<% end %>
<div id=''show_page'' <% if @section.has_sidebar
%>class=''span-18 last
vert_divider''<% end %>>
        <%= render :partial => ''pages/show'', :locals
=>
{ :page=>@page } %>
</div>

-----
In the controller :pages, I had a show_page method that just rendered
the partial again.

In Rails 3, I don''t know how to accomplish this.  I want to use
jQuery, which I already know how to code, but I don''t know how to get
it working in this way.  Should I create a js.erb file in my view?  I
watched the http://railscasts.com/episodes/205-unobtrusive-javascript
but I still don''t know how to get it working to update one part of the
page! Basically, I have this sidebar with links on it, and each time a
user a clicks on one of them, the central part of the page should
update - AJAX!  How do I do this? Do I still need this show_page
method in the controller?

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I found a clean answer, and I thought I''d explain the solution.
Basically, I was too caught up in the jQuery and etc. - in this case,
Prototype works very nicely.  With jQuery, I got to fumbling around
with a js.erb files.  With prototype, in this, case the solution is
really clean.

http://www.ruby-forum.com/topic/211467 describes a similar solution.

---The View---
<!-- section/show -->
<% if @section.has_sidebar %>
	<div id=''sidebar_div'' class=''span-3''>
		<ul class=''sidebar_list''>
		<% for page in @section.pages %>
			<li><%= link_to "#{page.name}", page, :remote => true
%></li>
			<hr/>
		<% end %>
		</ul>
	</div>
<% end %>
<div id=''show_page'' <% if @section.has_sidebar
%>class=''span-18 last
vert_divider''<% end %>>
	<%= render :partial => ''pages/show_page'', :locals =>
{ :page=>@page }
%>
</div>


---PagesController---
class PagesController < ApplicationController

  def show
    @page = Page.find(params[:id])
      respond_to do |format|
	format.js {
	  render(:update) do |page| # uses Prototype, the JS framework
	    page.replace_html ''show_page'', :partial =>
"show_page", :locals
=> { :page => @page }
	  end
	}
    end
  end

end

Hopefully this will help anyone who''s encountered this same problem,
so that person can come to the answer more quickly.  :D

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