Rails 下拉菜单
资源列表：http://www.ibm.com/developerworks/cn/xml/x-introajaxrails/
http://wiki.rubyonrails.com/rails/pages/HowtoUseFormOptionHelpers
有几种不同的写法，支持的功能不一样，保存下来
<%= select 'post', 'type_id', Type.find(:all).map {|x| } %>
<%= collection_select :Job, :client_id, Client.find(:all), :id, :name %>
我最后用的这段也贴上
<% @region_list=Region.find(:all).collect{|x| }
@region_list.unshift(['No Region', nil])%>
<td><%=select('analyzer','region_id',@region_list,{:selected=>@analyzer.region_id},html_options= {"onchange"=> remote_function(
:with =>"'region_id='+value",
:update => 'region_ip',
:url => {:controller=>:setup,:action => :changeip_with_ajax})})
%>
<%= select_tag "payment", options_for_select([ "VISA", "MasterCard", "Switch" ], "MasterCard") %>
@payments = {'Visa' => 1, 'Mastercard' => 2, 'Switch' => 3}
<%= select_tag 'payment[]', options_for_select(@payments), :multiple => true, :size => 3 %>
<%= select_tag "payment", options_for_select(%w{ VISA Mastercard Switch }) %>
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