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https://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();
%>






















 
 
 
 
 
 

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