本文介绍了一个简单的表单示例，展示了如何使用Prototype JavaScript库和Ruby on Rails框架中的form_tag及select_tag辅助方法来创建动态表单元素。通过这些方法，表单可以根据用户的选择自动提交。
<%= javascript_include_tag 'prototype' %>
<% form_tag '/sell/index', :method => :get do %>
<%= select_tag "id", options_for_select({'1' => 1, '2' => 2, '3' => 3}), { :index => nil, :onchange => 'this.form.submit()',:with => "'id='+value"} %>
<% end %>
<% form_tag '/sell/index', :method => :get do %>
<%= select_tag "id", options_for_select({'1' => 1, '2' => 2, '3' => 3}), { :index => nil, :onchange => 'this.form.submit()',:with => "'id='+value"} %>
<% end %>
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