Easyui的combobox实现动态数据级联效果

实现从数据库中动态获取对应的List集合，并在Easyui的combobox中显示出来。

实现的效果如下：

1、数据库的表设计如图所示

2、数据库中填写相关的数据，如图所示。如图所示【法律法规】是所属栏目，因此他的字段parentid是0。【中国公民出国】、【内地居民往来港澳】是属于法律法规的类别。因此他们的字段parentid是对应1，【法律法规】的字段categoryid是1.

3、相关的配置：已经在前面的博客中写了http://www.jb51.net/article/86381.htm

这里就不多写。只把关键代码贴出来。

4、对应的Action代码

package crj.portal.web.management.action;

import java.io.IOException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;

import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.hibernate.Criteria;
import org.hibernate.criterion.Order;

import com.sun.tools.javac.util.Log;

import crj.portal.web.management.model.Cpersontypetbl;
import crj.portal.web.management.service.CategoryService;
import crj.portal.web.management.service.ItemService;
import crj.portal.web.management.service.UserService;

public class ItemManageAction {

 Logger log=Logger.getLogger(this.getClass());

 private String page;
 private String rows;

 private String lanmuid;

 private ItemService itemService;// 依赖注入

 //下拉框--查询栏目
 public String categorytbl() throws Exception{
 List list=itemService.queryLanMu();
 this.toJsonArray(list);
 return null;
 }

 //根据栏目的ID 查询拥有的类别
 public String leibie() throws Exception{
 List list=itemService.queryLeiBie(lanmuid);
 this.toJsonArray(list);
 return null;
 }

 public String toJsonArray(List list) throws IOException{
 HttpServletResponse response = ServletActionContext.getResponse();
 HttpServletRequest request = ServletActionContext.getRequest();

 JSONArray json = JSONArray.fromObject(list);
 log.info("JSON格式：" +json.toString());
  response.setCharacterEncoding("utf-8");// 指定为utf-8
  response.getWriter().write(json.toString());// 转化为JSOn格式
 return null;
 }

 public String save() throws Exception {
 return this.alllist();
 }

 public ItemService getItemService() {
 return itemService;
 }

 public void setItemService(ItemService itemService) {
 this.itemService = itemService;
 }

 public String getPage() {
 return page;
 }

 public void setPage(String page) {
 this.page = page;
 }

 public String getRows() {
 return rows;
 }

 public void setRows(String rows) {
 this.rows = rows;
 }

 public UserService getUserService() {
 return userService;
 }

 public void setUserService(UserService userService) {
 this.userService = userService;
 }

 public CategoryService getCategoryService() {
 return categoryService;
 }

 public void setCategoryService(CategoryService categoryService) {
 this.categoryService = categoryService;
 }

 public String getLanmuid() {
 return lanmuid;
 }

 public void setLanmuid(String lanmuid) {
 this.lanmuid = lanmuid;
 }

}

5、对应的接口代码

public interface ItemService {

 //下拉框--查询栏目
 public List queryLanMu() throws Exception;

 //下拉框--查询类别
 public List queryLeiBie(String ids) throws Exception; 

}

6、对应的接口实现类代码

public class ItemServiceImpl implements ItemService {
 Logger log = Logger.getLogger(this.getClass());
 private SessionFactory sessionFactory;

 //下拉框--查询栏目
 public List queryLanMu() throws Exception {
 Criteria criteria=this.sessionFactory.getCurrentSession().createCriteria(Categorytbl.class);
 criteria.add(Restrictions.eq("parentid", 0));
 criteria.addOrder(Order.asc("categoryid"));
 return criteria.list();
 }

 //下拉框--查询类别
 public List queryLeiBie(String ids) throws Exception {
 int i=Integer.parseInt(ids);
 Criteria criteria=this.sessionFactory.getCurrentSession().createCriteria(Categorytbl.class);
 criteria.add(Restrictions.eq("parentid", i));
 criteria.addOrder(Order.asc("categoryid"));
 return criteria.list();
 }
 public SessionFactory getSessionFactory() {
 return sessionFactory;
 }

 public void setSessionFactory(SessionFactory sessionFactory) {
 this.sessionFactory = sessionFactory;
 }

}

7、对应的JSP代码

<%@ page language="java" errorPage="/error.jsp" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>

<%
 String path = request.getContextPath();
%>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>信息管理</title>
<!-- 引入Jquery -->
<script type="text/javascript" src="<%=path%>/easyui_1.3.2/jquery-1.8.0.min.js" charset="utf-8"></script>
<!-- 引入Jquery_easyui -->
<script type="text/javascript" src="<%=path%>/easyui_1.3.2/jquery.easyui.min.js" charset="utf-8"></script>
<!-- 引入easyUi国际化--中文 -->
<script type="text/javascript" src="<%=path%>/easyui_1.3.2/locale/easyui-lang-zh_CN.js" charset="utf-8"></script>
<!-- 引入easyUi默认的CSS格式--蓝色 -->
<link rel="stylesheet" type="text/css" href="<%=path%>/easyui_1.3.2/themes/default/easyui.css" />
<!-- 引入easyUi小图标 -->
<link rel="stylesheet" type="text/css" href="<%=path%>/easyui_1.3.2/themes/icon.css" />

<script type="text/javascript">
 /* 初始化下载表格信息 */
 $(function() {
 // 下拉框选择控件，下拉框的内容是动态查询数据库信息
 $('#lanmu').combobox({
  url:'itemManage!categorytbl',
  editable:false, //不可编辑状态
  cache: false,
  panelHeight: 'auto',//自动高度适合
  valueField:'categoryid',
  textField:'categoryName',

 onHidePanel: function(){
  $("#leibie").combobox("setValue",'');
 var lanmuid = $('#lanmu').combobox('getValue'); 

 $.ajax({
 type: "POST",
 url: "itemManage!leibie?lanmuid="+lanmuid,
 cache: false,
 dataType : "json",
 success: function(data){
 $("#leibie").combobox("loadData",data);
   }
  });
  }
   }); 

 $('#leibie').combobox({
  //url:'itemManage!categorytbl',
  editable:false, //不可编辑状态
  cache: false,
  panelHeight: 'auto',//自动高度适合
  valueField:'categoryid',
  textField:'categoryName'
 });

 });
</script>

</head>
<body>

 <!-- 工具拦 -->
 <div id="tb" style="padding: 3px">
 <form >

 <span>所属栏目:</span>
 <select id="lanmu" class="lanmu" style="width:160px; border: 1px solid #ccc"> </select>
 <span>类别:</span>
 <select id="leibie" class="leibie" style="width:160px; border: 1px solid #ccc"> </select>

 </form>
 </div>

</body>
</html>

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