easy-ui 有依赖关系的下拉列表(省市区县)


<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>修改</title>

<!-- 1jQuery的js包 -->

<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.min.js"></script>

<!-- 2css资源 -->

<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/default/easyui.css">

<!-- 3图标资源 -->

<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/icon.css">

<!-- 4easyui的js包 -->

<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.easyui.min.js"></script>

  <!-- 5本地语言包 -->

<script type="text/javascript" src="jquery-easyui-1.4.4/locale/easyui-lang-zh_CN.js"></script>

</head>

<body>

修改页面

<input id="cc2" class="easyui-combobox"

data-options="valueField:'id',textField:'text',

url:'json/combo.json'" />  

<br><br>

省：<input id="sheng" class="easyui-combobox" style="width:100px"

data-options="

url:'RegionServlet?parentid=0',

valueField:'regionID',

textField:'regionName',

onSelect:function(region){

$('#shi').combobox('clear');

$('#shi').combobox('reload','RegionServlet?parentid='+region.regionID);

//清理原有项

$('#qu').combobox('clear');

//清理下拉项

$('#qu').combobox('reload','RegionServlet');

}

"/>

<br><br>

市：<input id="shi" class="easyui-combobox" style="width:100px"

data-options="

url:'RegionServlet',

valueField:'regionID',

textField:'regionName',

onSelect:function(region){

$('#qu').combobox('clear');

$('#qu').combobox('reload','RegionServlet?parentid='+region.regionID);

}

"/>

<br><br>

区县：<input id="qu" class="easyui-combobox" style="width:100px"

data-options="

url:'RegionServlet',

valueField:'regionID',

textField:'regionName',

"/>

</body>

</html>

package com.hanqi.dao;

import java.util.ArrayList;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import org.hibernate.cfg.Configuration;

import org.hibernate.service.ServiceRegistry;

import com.hanqi.entity.Region;

public class RegionDAO {

	Configuration cfg=null;

	ServiceRegistry sr=null;

	SessionFactory sf=null;

	Session se=null;

	Transaction tr=null;

	public RegionDAO(){

	//加载配置文件

	 cfg=new Configuration().configure();

	//注册服务

	 sr=new StandardServiceRegistryBuilder()

			.applySettings(cfg.getProperties()).build();

	}

	//初始化

	private void init()

	{

		sf=cfg.buildSessionFactory(sr);

		se=sf.openSession();

		tr=se.beginTransaction();

	}

	//提交和释放资源

	private void destory()

	{

		tr.commit();

		se.close();

		sf.close();

	}

	//获取数据列表

	public List<Region> getList(String parentid)

	{

		List<Region> rtn=new ArrayList<>();

		init();

		//查询数据

		rtn=se.createQuery("from Region where parentRegionID = ?")

				.setString(0, parentid).list();

		destory();

		return rtn;

	}

}

package com.hanqi.Service;

import java.util.List;

import com.hanqi.dao.RegionDAO;

import com.hanqi.entity.Region;

public class RegionService {

	//获取

	public List<Region> getList(String parentid){

		return new RegionDAO().getList(parentid);

	}

}

package com.hanqi.Servlet;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson.JSONArray;

import com.hanqi.Service.RegionService;

import com.hanqi.entity.Region;

public class RegionServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

    public RegionServlet() {

        super();

        // TODO Auto-generated constructor stub

    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		request.setCharacterEncoding("UTF-8");

		response.setCharacterEncoding("UTF-8");

		response.setContentType("text/html");

		//接收参数

		String parentid=request.getParameter("parentid");

		if(parentid!=null)

		{

		//读取地区列表

		List<Region> lr=new RegionService().getList(parentid);

		//返回JSON格式的数据

		String json=JSONArray.toJSONString(lr);

		response.getWriter().print(json);

		}

		else

		{

			response.getWriter().print("[]");

		}

	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		// TODO Auto-generated method stub

		doGet(request, response);

	}

}