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2011-03-29T13:56:19.860
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2014-06-18T06:51:51.260
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2014-06-18T06:51:51.260
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This <a href="http://pullmonkey.com/2008/03/30/dynamic-select-boxes-ruby-on-rails/" rel="nofollow">link</a> may help you in doing it. Rails 2 + Prototype app/models/cities.rb <pre><code>class City < ActiveRecord::Base has_many :regions has_many :reports, :through => :regions # this is newly added end </code></pre> cities_controller <pre><code>class CitiesController < ApplicationController def index @cities = City.find(:all) @regions = Region.find(:all) @reports = Report.find(:all) end def update_regions # updates regions and reports based on city selected city = City.find(params[:city_id]) regions = city.regions reports = city.reports render :update do |page| page.replace_html 'regions', :partial => 'regions', :object => regions page.replace_html 'reports', :partial => 'reports', :object => reports end end def update_reports # updates reports based on region selected region = Region.find(params[:region_id]) reports = region.reports render :update do |page| page.replace_html 'reports', :partial => 'reports', :object => reports end end end </code></pre> _reports.html.erb <pre><code><%= collection_select(nil, :report_id, reports, :id, :title, {:prompt => "Select a Report"}) %> </code></pre> _regions.html.erb <pre><code><%= collection_select(nil, :region_id, regions, :id, :name, {:prompt => "Select a Region"}, {:onchange => "#{remote_function(:url => {:action => "update_reports"}, :with => "'region_id='+value")}"}) %> </code></pre> index.html.erb <pre><code><%= javascript_include_tag :defaults %> <%= collection_select(nil, :city_id, @cities, :id, :name, {:prompt => "Select a City"}, {:onchange => "#{remote_function(:url => {:action => "update_regions"}, :with => "'city_id='+value")}"}) %> <div id="regions"><%= render :partial => 'regions', :object => @regions %></div> <div id="reports"><%= render :partial => 'reports', :object => @reports %></div> </code></pre>
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