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

 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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