本文介绍了如何利用Jquery的treeview插件展示从数据库获取的树形结构数据。首先，根据KPI_CODE、KPI_NAME、PARENT_CODE和LVL_ID字段组织数据，然后分步加载数据：默认显示前两级目录，点击二级目录加载三级目录。最后通过调用java代码和treeview插件来呈现数据。
Jquery的treeview插件实现树形结构
最近由于功能需要，要将数据库中的数据取出来，展现的形式是树状结构。
表中的数据大致为：
KPI_CODE为唯一id,KPI_NAME为名字，PARENT_CODE为父id，LVL_ID为层级
要展现的形式为：
具体实现逻辑如下：
思路：将数据库的数据查询出来，按某种格式处理后返回给前台，前台用jQuery的treeview插件将数据展现为树状结构。
步骤：
1.默认加载前两级目录
2.点击第二级目录，继续加载第三级目录
3.调用插件处理数据
java代码：
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import org.apache.struts2.ServletActionContext;
public class FMTreeAction {
private String id;//指标id
private String parentId;//父id
private String lvl;//等级
private String calcObjType;//岗位id
private DaoHelper daoHelper;
public String execute(){
return "success";
}
public String getSubFMObj(){
//System.out.println("getSubFMObj...");
System.out.println("***id:"+id+",parentId:"+parentId+",calcObjType:"+calcObjType+",lvl:"+lvl);
int lvlId = Integer.parseInt(lvl)+1;
this.lvl = String.valueOf(lvlId);
System.out.println("***id:"+id+",parentId:"+parentId+",calcObjType:"+calcObjType+",newlvl:"+lvl);
List subList = daoHelper.queryForList("ecthree.manParaInfo.initTree.getSubFMObj", this);
//List resultList = new ArrayList();
int subSize = subList.size();
for (int i = 0; i < subSize; i++) {
Map<String, Object> subMap = (Map<String, Object>) subList.get(i);
valueChange(subMap);
//打印输出
//System.out.println("subMap--"+i+":");
//BccUtils.printMap(subMap);
}
this.response(JSONArray.fromObject(subList).toString());
return null;
}
//获取一级二级节点
public String getFMObj(){
//System.out.println(id);
//获取一级目录
List fatherList = daoHelper.queryForList("ecthree.manParaInfo.initTree.getOneFMObj", this);
//System.out.println("fatherList.size()---"+fatherList.size());
for(int k = 0; k < fatherList.size(); k++){
Map<String, Object> fatherMap = (Map<String, Object>) fatherList.get(k);
valueChange(fatherMap);
//打印输出
//System.out.println("fatherMap--"+k+":");
//BccUtils.printMap(fatherMap);
//根据一级目录id查询二级目录
this.parentId = (String)fatherMap.get("KPI_CODE");
System.out.println("parentId:"+parentId);
List subList =daoHelper.queryForList("ecthree.manParaInfo.initTree.getTwoFMObj",this);
int subSize = subList.size();
for (int i = 0; i < subSize; i++) {
Map<String, Object> subMap = (Map<String, Object>) subList.get(i);
valueChange(subMap);
//打印输出
//System.out.println("subMap--"+i+":");
//BccUtils.printMap(subMap);
}
fatherMap.put("ChildNodes", subList);
}
this.response(JSONArray.fromObject(fatherList).toString());
return null;
}
private void valueChange(Map<String, Object> map) {
map.put("id", map.get("KPI_CODE"));
map.put("text", map.get("KPI_NAME"));
map.put("calcObjType", map.get("CLAL_OBJ_TYPE"));
map.put("lvl", map.get("LVL_ID"));
map.put("parent_id", map.get("PARENT_CODE"));
BigDecimal childNum = (BigDecimal) map.get("CHILDNUM");
if (childNum == null || childNum.intValue() == 0) {
map.put("hasChildren", false);
} else {
map.put("hasChildren", true);
}
}
protected void response(String message){
try {
HttpServletResponse response =ServletActionContext.getResponse();
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
out.print(message);
out.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public DaoHelper getDaoHelper() {
return daoHelper;
}
public void setDaoHelper(DaoHelper daoHelper) {
this.daoHelper = daoHelper;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getParentId() {
return parentId;
}
public void setParentId(String parentId) {
this.parentId = parentId;
}
public String getCalcObjType() {
return calcObjType;
}
public void setCalcObjType(String calcObjType) {
this.calcObjType = calcObjType;
}
public String getLvl() {
return lvl;
}
public void setLvl(String lvl) {
this.lvl = lvl;
}
}
jsp：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="b" uri="/bonc-tags" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String contextPath = request.getContextPath();
%>
<html>
<head>
<s:head />
<s:head template="head_ext.ftl" />
<script>
var contextPath="<%=contextPath%>";
</script>
<link href="<%=contextPath%>/resources/boncbcs/base/css/base.css" rel="stylesheet" type="text/css" />
<link href="<%=contextPath%>/resources/boncbcs/tho/jquery/jqueryui/themes/ui-lightness/jquery.ui.all.css" rel="stylesheet" type="text/css" />
<link href='<b:url value="/resources/boncbcs/bcc/base/css/base.css"/>' rel="stylesheet" type="text/css"/>
<link href='<b:url value="/resources/boncbcs/bcc/org/css/01-base.css"/>' rel="stylesheet" type="text/css" />
<link href="<%=contextPath%>/resources/boncbcs/tho/jquery/tree/css/tree.css" rel="stylesheet" type="text/css" />
<link href="<%=contextPath%>/resources/boncbcs/bcc/org/css/tree.css" rel="stylesheet" type="text/css" >
<link href="<%=contextPath%>/resources/boncbcs/tho/jquery/tree/css/page.css" rel="stylesheet" type="text/css" />
<link href="<%=contextPath%>/resources/boncbcs/bcc/ptl/bccptl.css" rel="stylesheet" type="text/css" />
<script src="<%=contextPath%>/resources/boncbcs/tho/jquery/jquery.min.js" type="text/javascript"></script>
<script src="<%=contextPath%>/resources/boncbcs/tho/jquery/jquery.ui.custom.min.js" type="text/javascript"></script>
<script src="<%=contextPath%>/resources/boncbcs/tho/jquery/jquery.validate.pack.js" type="text/javascript"></script>
<script type="text/javascript" src="<%=contextPath%>/resources/boncbcs/tho/My97DatePicker/WdatePicker.js" defer="defer"></script>
<script src="<%=contextPath%>/resources/boncbcs/bcc/base/js/showTips.js" type="text/javascript"></script>
<script src="<%=contextPath%>/resources/boncbcs/tho/jquery/tree/jquery.tree.js" type="text/javascript"></script>
<script src='<b:url value="/resources/boncbcs/tho/jquery/fileUpload/ajaxfileupload.js"/>' type="text/javascript"></script>
<script src="<%=contextPath%>/resources/boncbcs/js/forbid.js" type="text/javascript"></script>
<link href="<%=contextPath%>/resources/boncbcs/bcc/bonc_bt/css/bonc_new.css" rel="stylesheet" type="text/css" >
<script type="text/javascript">
//点击框，展示树
var orgFoucus=function(){
//alert($("#calc_obj_type").val());
initTree();
var offset = $("#selectCalcObjType").offset();
var _height = $("#selectCalcObjType").height()+5;
$("#mainTree").css('left',offset.left);
$("#mainTree").css('top',offset.top+_height);
$("#mainTree").show();
};
//关闭
var closeWin=function(){
$("#tree1").html('');
$("#mainTree").hide();
};
//清空
function clearObjs(){
$("#selectCalcObjType").val('');
$("#CALC_OBJ_TYPE").val('');
$("#mainTree").hide();
}
//确定
function confirmWin(){
$("#mainTree").hide();
var itemIds = '';
var itemNms = '';
var str = "";
$('#tree1 li li img[src$="checkbox_1.gif"]').each(function(){
var arr = this.id.substring(6, this.id.length-3);
if(arr.length>6){
itemNms += jQuery(this).parent().attr("title") + ',';
itemIds += arr + ',';
}
});
$("#myTree").html("");
$("#myTree").html(itemIds+"<br/>"+itemNms);
}
//初始化树的前两级
var initTree=function(){
$.getJSON(contextPath+"/bcc/ecthree/MyTree/FMTree!getFMObj.action", loadFMTree);
};
//处理初始化的前两级目录，即将其展现
function loadFMTree(loadDataAll){
var calcObjType = $("#calcObjType").val();//获取岗位id
//alert(calcObjType);
var roots = new Array();//一级目录数组
for(var i=0;i<loadDataAll.length;i++){
var loadData = loadDataAll[i];
var root = {"id":loadData.id, "text":loadData.text, complete:true, "isexpand":false,"hasChildren":loadData.hasChildren, ChildNodes:loadData.ChildNodes, "lvl":loadData.LVL};
roots[i] = root;
}
//showcheck为true时，表示可以多选
var o = {showcheck:true, url:contextPath+"/bcc/ecthree/MyTree/FMTree!getSubFMObj.action?calcObjType="+calcObjType, onnodeclick:function (item) {
//$("#myTree").html("");
//var str = "id:"+item.id+"--name:"+item.text;
//$("#myTree").html(str);
//$("#mainTree").hide();
}};
o.data = roots;
o.path = contextPath;
$("#tree1").treeview(o);
}
</script>
</head>
<body style="overflow-y:auto;">
<div class="appletBox" >
<div class="appletTitleBar">
<div class="appletTitle"><s:property value="pojo.CALC_OBJ_TYPE_DESC"/>薪酬因子配置</div>
<div class="appletIcon">
</div>
</div>
</div>
<table class="table11" style="width: 100%;">
<tr height="34px">
<td align="left">岗位类型：
<select id="calc_obj_type">
<option value="A01030_01">岗位1</option>
<option value="A01030_02">岗位2</option>
<option value="A01030_03">岗位3</option>
<option value="A01030_04">岗位4</option>
<option value="A01030_05">岗位5</option>
<option value="A01030_06">岗位6</option>
<option value="A01030_07">岗位7</option>
</select>
</td>
<td align="left">负面清单：<s:textfield id="selectCalcObjType" onclick="orgFoucus()" /></td>
</tr>
</table>
<div id="mainTree" style="display:none;width:240px;height:306px;position: absolute;">
<div style="width:231px;height:299px;" class="x-window-background"></div>
<div style="width:230px;" class="x-window">
<div class="x-panel-header" >
<span style="margin-left: 0px;">岗位类型</span>
<a style="margin-left: 40px" href="#" onclick="confirmWin();">确定</a>
<a style="margin-left: 10px" href="#" onclick="clearObjs();">清空</a>
<a style="margin-left: 10px" href="#" onclick="closeWin();">关闭</a>
</div>
<div style="width: 228px;height:270px;overflow: auto;" class="x-panel-body">
<div id="tree1" align="left" style="padding-left:20px;" class="ztree">
</div>
</div>
</div>
</div>
<div id="showFileUp" class="fileUpDiv"></div>
<div id="myTree">123123</div>
</body>
</html>mapper:
<!-- 查询子节点 -->
<select id="getSubFMObj" resultClass="java.util.HashMap">
select a.*,
(select count(1) from kpicode.fm_kpi_code b
where a.kpi_code = b.parent_code
) as childNum
from kpicode.fm_kpi_code a
where parent_code = #id# and lvl_id = #lvl#
order by kpi_code
</select>
<!-- 一级目录 -->
<select id="getOneFMObj" resultClass="java.util.HashMap">
select a.*,
(select count(1) from kpicode.fm_kpi_code b where a.kpi_code = b.parent_code) as childNum
from kpicode.fm_kpi_code a where a.lvl_id='1' and calc_obj_type is null order by kpi_code
</select>
<!-- 二级目录 -->
<select id="getTwoFMObj" resultClass="java.util.HashMap">
select *
from (select a.*,
(select count(1)
from kpicode.fm_kpi_code b
where a.kpi_code = b.parent_code) as childNum
from kpicode.fm_kpi_code a
where a.parent_code = #parentId#
order by a.kpi_code)
</select>
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