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# app\controllers\examples_controller.rb
ruby ´úÂë
 
class ExamplesController < ApplicationController  
  
  def ajax_select  
    @items = %w{AA BB}  
  end  
    
  def get_sub_items  
    if params[:item] == "AA"  
      @sub_items = %w{AA1 AA2}  
    else  
      @sub_items = %w{BB1 BB2}  
    end  
      
    render :partial => "select"  
  end  
end  
# app\views\examples\ajax_select.rhtml
xml ´úÂë
 
<%= javascript_include_tag :defaults %>  
  
<h1>Examples#ajax_select</h1>  
<p>Find me in app/views/examples/ajax_select.rhtml</p>  
  
<%= select :obj, :att,  @items, {}, :onchange => remote_function(:update => "sub_items",  
       :method => "get",  
       :with => "'item=' + value",  
       :url => { :controller => :examples, :action => :get_sub_items})   
       %>  
<div id="sub_items">  
  <select></select>  
</div>  
#app\views\examples\_select.rhtml
ruby ´úÂë
 
<%= select(:obj, :item


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