eecg的代码生成器很不错，但是可能有的时候不是那么符合我们实际项目的功能需求，这里会首先介绍jeecg原生生成的样子，以及根据需求进行的改造。Jeecg中的<t:datagrid>就是将easyui进行封装而成。jsp页面引入：<%@include file="/context/mytags.jsp"%>，在mytags.jsp中<%@ taglib prefix="t" uri="/easyui-tags"%>的这条即为jeecg对easyui的封装。扯得有点远了，回到主题上来。Jeecg中的treegrid的树形结构的实现：
部分需求构造：树形结构图中的是区域划分。区域存于一张表，通过parientid判断其父节点。
需求症状：根据登陆用户所在区域，选择监测区域时为其显示该区域下的子级区域供其选择。并且默认选中原先保存的区域。选中子级区域时不得默认为其选中父级区域。
需求诊断：treegrid为懒加载形式，先加载的是最外层的区域，当点击某区域要为其展开下级时，又会去controller加载出其子级。
需求药方：
1：jsp页面中的<t:datagrid>中的treegrid设置为true。形式为：
<!-- title表格标题，pagination是否分页，由于是树形最好是设置为不显示分页比较符合逻辑的，actionUrl为访问的Controller，checkbox为是否显示复选框
treegrid为是否是树形列表，idField为主键字段，onLoadSuccess为数据加载成调用方法
-->
<t:datagrid name="addList" title="树形列表" pagination="false" actionUrl="regimeController.do?departFunction&monitorId=${monitorId}" checkbox="true" treegrid="true" idField="id" onLoadSuccess="loadSuccess">
2：在RegimeController类里添加方法：departFunction并为其添加注解。函数如下：
@RequestMapping(params = "departFunction")
@ResponseBody
public List<TreeGrid> departFunction(TSDepart tSDepart,HttpServletRequest request, HttpServletResponse response, TreeGrid treegrid) {
String departid = request.getParameter("monitorId");//获取页面参数 即用户区域id
StringBuffer sqlList = new StringBuffer();
sqlList.append("SELECT * FROM T_S_DEPART WHERE DELFLAG =0 ");//利用的是原生的depart表，文末我会给出depart类和表形式
if (treegrid.getId() != null) {
sqlList.append(" AND parentdepartid = '"+treegrid.getId()+"'");//点击下级时加载下级列表
} else {
sqlList.append(" AND id = '"+departid+"'");//查找当前登录用户对应的区域
}
List<Record> parList = Db.use("gl").find(sqlList.toString()); //jFinal 数据库走起
List<TSDepart> parDepart = new ArrayList<TSDepart>();
for (int i = 0; i < parList.size(); i++) {
TSDepart tagDepart = new TSDepart();
tagDepart.setId(parList.get(i).getStr("id"));
tagDepart.setDepartname(parList.get(i).getStr("departname"));
tagDepart.setDescription(parList.get(i).getStr("description"));
List<TSDepart> sonDepartList = new ArrayList<TSDepart>();
//有下级则继续 否则为null
String sql = "SELECT * FROM T_S_DEPART WHERE DELFLAG =0 AND PARENTDEPARTID='"+parList.get(i).getStr("id")+"'";
List<Record> sonList = Db.use("gl").find(sql);
//这里的目的是没有下级了则需要显示为文件的形式，而不是文件夹的形式。不理解的话，注释了再看效果你就明白了
if(sonList.size()>0){
tagDepart.setTSDeparts(sonDepartList);
}else{
tagDepart.setTSDeparts(null);
}
TSDepart sonDepart = new TSDepart();
sonDepartList.add(sonDepart);
parDepart.add(tagDepart);
}
//树形列表模型设置类 页面上要对应起来显示的
List<TreeGrid> treeGrids = new ArrayList<TreeGrid>();
TreeGridModel treeGridModel = new TreeGridModel();
treeGridModel.setTextField("departname");
treeGridModel.setParentText("TSPDepart_departname");
treeGridModel.setParentId("TSPDepart_id");
treeGridModel.setSrc("description");
treeGridModel.setIdField("id");
treeGridModel.setChildList("TSDeparts");
treeGrids = systemService.treegrid(parDepart, treeGridModel);
return treeGrids;
}
3：回到原来那个jsp页面上
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@include file="/context/mytags.jsp"%>
<!DOCTYPE html >
<html>
<head>
<title>树形列表</title>
<t:base type="jquery,easyui,tools"></t:base>
</head>
<body style="overflow-y: hidden" scroll="no">
<input type="hidden" name="departId" value="${departId}" id="departId">
<t:datagrid name="addList" title="树形列表" pagination="false" actionUrl="regimeController.do?departFunction&monitorId=${monitorId}" checkbox="true" treegrid="true" idField="id" onLoadSuccess="loadSuccess">
<t:dgCol title="编号" field="id" treefield="id" hidden="false"></t:dgCol>
<t:dgCol title="单位名称" field="departname" treefield="text"></t:dgCol>
<t:dgCol title="所属区域" field="description" treefield="src"></t:dgCol>
</t:datagrid>
</body>
<script type="text/javascript">
function loadSuccess(data){
var departId = $('#departId').val();//默认选中的区域
var monitorId = "${monitorId}";//第一行树形
if(!(departId=="")){
$('#addList').treegrid('collapseAll');//合并树形
$('#addList').treegrid('expandAll');//展开树形
$('#addList').treegrid('select',monitorId);//选中第一行
$("#addList").treegrid("unselectAll");//取消选择
var result=departId.replace(/s+/g,"");//去空格
var ids=result.split(",");//分割
//$.each(ids,function(index,obj){
// $("#addList").treegrid("select",obj);
//});
for(var i = 0;i<ids.length;i++){
$("#addList").treegrid("select",ids[i]);//默认选中
}
}
}
</script>
看到这里也许就要问了：为何有这五行代码
$('#addList').treegrid('collapseAll');//合并树形
$('#addList').treegrid('expandAll');//展开树形
$('#addList').treegrid('select',monitorId);//选中第一行
$("#addList").treegrid("unselectAll");//取消选择
var result=departId.replace(/s+/g,"");//去空格
问题很多，要不就是前边的序列号全是0，要不就是多行被默认选中时，只能选几条，要不就是无法选中等等问题，其实解决的思路就是模拟人实际操作的时候要点击才会加载，去空格这是个好习惯，未加这行前，就是不能选中，只能选中一条，简直就是莫名其妙的bug啊，想了好几天，边维护其他项目，边想这个，最后在alrt的时候，看着那id发呆，然后发现是页面直接写的值就行，传过来就不行，思前想后啊，才发现是空格的原因啊。哎，还是太年轻啊。、
最后跟上代码，利用的是张大大的类来模拟了一下的功能。写的不是很好呀，小菜一枚望见谅。
1 package org.jeecgframework.web.system.pojo.base;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 import javax.persistence.CascadeType;
7 import javax.persistence.Column;
8 import javax.persistence.Entity;
9 import javax.persistence.FetchType;
10 import javax.persistence.JoinColumn;
11 import javax.persistence.ManyToOne;
12 import javax.persistence.OneToMany;
13 import javax.persistence.Table;
14
15 import org.jeecgframework.core.common.entity.IdEntity;
16
17 /**
18 * 部门机构表
19 * @author 张代浩
20 */
21 @Entity
22 @Table(name = "t_s_depart")
23 public class TSDepart extends IdEntity implements java.io.Serializable {
24 private TSDepart TSPDepart;//上级部门
25 private String departname;//部门名称
26 private String description;//部门描述
27 private String longitude;//经度
28 private String latitude;//纬度
29 private String address;//地址
30 private String code;
31 private Integer dtype;
32 private Integer delflag;
33 private Integer xh;
34 private List<TSDepart> TSDeparts = new ArrayList<TSDepart>();//下属部门
35
36 @ManyToOne(fetch = FetchType.LAZY)
37 @JoinColumn(name = "parentdepartid")
38 public TSDepart getTSPDepart() {
39 return this.TSPDepart;
40 }
41
42 public void setTSPDepart(TSDepart TSPDepart) {
43 this.TSPDepart = TSPDepart;
44 }
45
46 @Column(name = "address", nullable = false, length = 100)
47 public String getAddress() {
48 return this.address;
49 }
50
51 public void setAddress(String address) {
52 this.address = address;
53 }
54
55 @Column(name = "longitude", nullable = false, length = 50)
56 public String getLongitude() {
57 return this.longitude;
58 }
59
60 public void setLongitude(String longitude) {
61 this.longitude = longitude;
62 }
63
64 @Column(name = "latitude", nullable = false, length = 50)
65 public String getLatitude() {
66 return this.latitude;
67 }
68
69 public void setLatitude(String latitude) {
70 this.latitude = latitude;
71 }
72
73 @Column(name = "departname", nullable = false, length = 100)
74 public String getDepartname() {
75 return this.departname;
76 }
77
78 public void setDepartname(String departname) {
79 this.departname = departname;
80 }
81
82 @Column(name = "description", length = 500)
83 public String getDescription() {
84 return this.description;
85 }
86
87 public void setDescription(String description) {
88 this.description = description;
89 }
90
91 @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "TSPDepart")
92 public List<TSDepart> getTSDeparts() {
93 return TSDeparts;
94 }
95
96 public void setTSDeparts(List<TSDepart> tSDeparts) {
97 TSDeparts = tSDeparts;
98 }
99
100 public String getCode() {
101 return code;
102 }
103
104 public void setCode(String code) {
105 this.code = code;
106 }
107
108 public Integer getDtype() {
109 return dtype;
110 }
111
112 public void setDtype(Integer dtype) {
113 this.dtype = dtype;
114 }
115
116 public Integer getDelflag() {
117 return delflag;
118 }
119
120 public void setDelflag(Integer delflag) {
121 this.delflag = delflag;
122 }
123 @Column(name = "xh", nullable = false, length = 50)
124 public Integer getXh() {
125 return xh;
126 }
127
128 public void setXh(Integer xh) {
129 this.xh = xh;
130 }
131
132
133
134 }