省份与学校的级联完成！

app/controllers/school_controller.rb

@@ -1,2 +1,15 @@
 class SchoolController < ApplicationController
+  def get_options
+    @school = School.where("province = ?", params[:province])
+    p = params[:province]
+    ##@school = School.all
+    options = ""
+    
+    @school.each do |s|
+      options << "<option value=#{s.name}>#{s.name}</option>"
+    end
+    
+    render :text => options
+    
+  end
 end

app/views/my/account.html.erb

@@ -1,3 +1,20 @@
+ <script type="text/javascript">
+ 	function get_options(value){
+ 		$.ajax({
+ 			type :"POST",
+ 			url :'/school/get_options/'+encodeURIComponent(value),
+ 			data :'text', 
+ 			success: function(data){
+ 				$("#occupation").html(data);
+ 				
+ 			}
+ 		}
+ 			
+ 		)
+ 	}
+ </script>
+ 
+ 
  <div class="contextual" style="padding-right: 10px;">
 	<%= link_to(l(:button_change_password), {:action => 'password'}, :class => 'icon icon-passwd') if @user.change_password_allowed? %>
 	<%= call_hook(:view_my_account_contextual, :user => @user)%>
@@ -72,9 +89,9 @@
 		
 		<!-- added by Wen -->
 		<p style="width:357px;padding-left: 26px;">
-			<%= l(:field_occupation) %>&nbsp;<select name='province'><%= options_from_collection_for_select(School.find_by_sql("select distinct province from schools"), :province, :province) %></select>
+			<%= l(:field_occupation) %>&nbsp;<%= select_tag "province", options_from_collection_for_select(School.find_by_sql("select distinct province from schools"), :province, :province), :onchange => "get_options(this.value)" %>
 
-			<%= select_tag 'occupation', options_from_collection_for_select(School.all, :name, :name) %>
+			<%= select_tag "occupation" %>
 		</p>