jquery json实现二级动态联动

以下为代码！需要导入json架包

function getCity1(){

		var unitid = document.getElementById('addformunitid').value;

		   $.getJSON("../unit/getcity.do?unitid="+unitid, "", function(response){

		   //$ ("#departmentid").show();//将隐藏的select显示出来

		   $ ("#adddepartmentid option").remove();//将select中的信息清空

		   $ ("#adddepartmentid").attr("disabled",false);

		   //alert(response);

			$.each(response,function(i){

			     //encodeURI(response[i]);

				//encodeURI(fileName)

				//将后台传回的信息打印到页面中

   	     	    $ ("#adddepartmentid").append ("<option value="+response[i].id+">"+ response[i].departmentname +"</option>");

			});

		});

 }

<tr>

				<td class="td_title">所属单位<em>*</em></td>

				<td>

					<select name="eform.unitid"   id="addformunitid"  onChange="getCity1();">

						<option value="0">请选择</option>

						<#list unitList as ul>

							<option value="${ul.id}">${ul.unitname}</option>

						</#list>

					</select>

				</td>

				<td class="td_title">部门<em>*</em></td>

				<td>

					<select name="eform.departmentid" id="adddepartmentid" disabled="disabled">

					    <option value=" ">请选择</option>

					</select>

				</td>

				 <td class="td_title">职位<em>*</em></td>

				<td>

					<select name="eform.positionid">

					<option value=" ">请选择-</option>

						<#list positionList as pl>

							<option value="${pl.id}">${pl.positionname}</option>

						</#list>

					</select>

				</td>

			</tr>

        <!-- 单位，部门二级联动 -->

        <package name="unit" extends="webwork-default" namespace="/unit">

		<action name="getcity" class="com.hnbus.action.unit.EmployeeJsonAction"  method="getcity" >

			<interceptor-ref name="defaultStack"/>

		</action>

	</package>

/*

 *文件名:EmployeeJsonAction.java

 *描  述:二级联动action

 *版  权:********有限公司 Copyright (c) 2008-2013,All Rights Reserved.

 *创建者:向洁

 *修改者:向洁

 */

package com.hnbus.action.unit;

import java.io.PrintWriter;

import java.net.URLDecoder;

import java.util.List;

import javax.annotation.Resource;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;

import org.apache.log4j.Logger;

import org.eps.action.BaseAction;

import com.hnbus.model.Department;

import com.hnbus.model.Employee;

import com.hnbus.service.unit.EmployeeService;

import com.opensymphony.webwork.ServletActionContext;

/**

 * @Description (二级联动action)

 * @author   向洁

 * @version  JOHOM V1.0

 * @Date	 2013-8-4-下午10:54:05

 * @see

 */

public class EmployeeJsonAction  extends BaseAction{

	private static final Logger logger = Logger.getLogger(EmployeeAction.class);

	@Resource

	private EmployeeService employeeService;

	private EmployeeForm1 eform;

	private String unitid;

	public String getcity() throws Exception {

		logger.info("选择单位ID");

		//获取前台传来的值

		String unitid = this.getRequest().getParameter("unitid");

        HttpServletResponse response = ServletActionContext.getResponse();

        /*设置字符集为'UTF-8'*/

        response.setContentType("text/plain;charset=utf-8");

		List<Department> department = employeeService.findSameDepartmentlist(unitid);

        ServletActionContext.getRequest().getSession().setAttribute("department",department);

		//将list转换成JSON对象

	    JSONArray jr = JSONArray.fromObject(department);

	    PrintWriter out = this.getResponse().getWriter();

		//将JSON对象转换成String类型传入前台

		String jsonUser = jr.toString();

		out.print(jsonUser);

		out.flush();

		out.close();

		return null;

	}

	/**

	 * 变量:employeeService

	 * @return 变量:employeeService

	 */

	public EmployeeService getEmployeeService() {

		return employeeService;

	}

	/**

	 * 变量:eform

	 * @return 变量:eform

	 */

	public EmployeeForm1 getEform() {

		return eform;

	}

	/**

	 * 变量:eform

	 * @param eform (Set the variable:eform)

	 */

	public void setEform(EmployeeForm1 eform) {

		this.eform = eform;

	}

	/**

	 * 变量:employeeService

	 * @param employeeService (Set the variable:employeeService)

	 */

	public void setEmployeeService(EmployeeService employeeService) {

		this.employeeService = employeeService;

	}

	/**

	 * 变量:logger

	 * @return 变量:logger

	 */

	public static Logger getLogger() {

		return logger;

	}

	/**

	 * 变量:unitid

	 * @return 变量:unitid

	 */

	public String getUnitid() {

		return unitid;

	}

	/**

	 * 变量:unitid

	 * @param unitid (Set the variable:unitid)

	 */

	public void setUnitid(String unitid) {

		this.unitid = unitid;

	}

}

class EmployeeForm1 extends Employee{}