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Easyui的combobox实现动态数据级联效果

作者：海潜　　发布时间：2022-02-15 07:26:13　

标签：Easyui,combobox,级联

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();
％>
<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>

<script type="text/javascript" src="<％=path％>/easyui_1.3.2/jquery-1.8.0.min.js" charset="utf-8"></script>

<script type="text/javascript" src="<％=path％>/easyui_1.3.2/jquery.easyui.min.js" charset="utf-8"></script>

<script type="text/javascript" src="<％=path％>/easyui_1.3.2/locale/easyui-lang-zh_CN.js" charset="utf-8"></script>

<link rel="stylesheet" type="text/css" href="<％=path％>/easyui_1.3.2/themes/default/easyui.css" />

<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>


<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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Easyui的combobox实现动态数据级联效果

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