jQuery ztree实现动态树形多选菜单

<div > 
 <ul id="treeDemo" class="ztree" style="margin-top: 0; width: 160px;"> 
 </ul> 
</div>

<script type="text/javascript">
$(function(){
 $.ajax({ 
  url: '${contextPath}/om/quoteOmRequest.do?flag=init',
  data: { 
   name : '1' //随便写的，传入后台的值
  },
  type:'post',
  traditional: true,
  success: function(data){
   var dataObj = eval(data);
   var zTreeObj;
   var setting = {
     data: { 
      simpleData: { 
       enable:true, 
       /* idKey: "id", 
       pIdKey: "pId" */ 
      } 
     },
     check: {
      enable: true,
      chkboxType :{ "Y" : "", "N" : "s" } //Y:勾选（参数：p:影响父节点），N：不勾（参数s：影响子节点）[p 和 s 为参数，参数都不写""为全不影响]
     },
     callback: {
      onCheck: 
        function() { 
         var zTree = $.fn.zTree.getZTreeObj("treeDemo");
         var checkCount = zTree.getCheckedNodes(true);
         var classpurview = "";
         for(var i=0;i<checkCount.length;i++) {
           classpurview += checkCount[i].id+","  //存入数据的id，比如这种形式"1,2,5," 后台截取下
         }
         /* alert(classpurview); */
       } ,
     },
     view: { 
      showLine: true, 
      showIcon: true, 
      dblClickExpand: true 
     }, 
   };
   var zNodes = dataObj; 
   $(document).ready(function(){
    $.fn.zTree.init($("#treeDemo"), setting, zNodes);
   });
  },
  error : function() { 
   alert("异常！"); 
  }
 });
});
</script>

<script type="text/javascript">
var setting = {
  view: {
   selectedMulti: false
  },
  check: {
   enable: true,
   chkboxType :{ "Y" : "", "N" : "s" } //Y:勾选（参数：p:影响父节点），N：不勾（参数s：影响子节点）[p 和 s 为参数，参数都不写""为全不影响]
  },
  async: {
   enable: true,
   url:"${contextPath}/om/quoteOmRequest.do?flag=ajax",
   autoParam:["id"], 
   dataFilter: filter
  },
  callback: {
   beforeClick: beforeClick,
  }
 };

 function filter(treeId, parentNode, childNodes) {
  if (!childNodes) return null;
  for (var i=0, l=childNodes.length; i<l; i++) {
   childNodes[i].name = childNodes[i].name.replace(/\.n/g, '.');
  }
  return childNodes;
 }
 function beforeClick(treeId, treeNode) {
  if (!treeNode.isParent) {
   alert("请选择父节点，此节点是根节点...");
   return false;
  } else {
   return true;
  }
 }

 $(document).ready(function(){
  $.fn.zTree.init($("#treeDemo"), setting);
 });
</script>

  String flag = request.getParameter("flag");
  if(flag.equals("init")){//直接加载ztree
   List<Inner> list = getTrees();//得到所有节点
   try {
    convertListToJson(list);
   } catch (Exception e) {
    e.printStackTrace();
   }
  }else if(flag.equals("ajax")){//延迟加载ztree
   String id = request.getParameter("id");
   if(id==null){//第一次进入初始化父节点
    List<Inner> list = new ArrayList<OmRequestImpl.Inner>();
    Inner in1=getById(1);
    Inner in5=getById(5);
    list.add(in1);
    list.add(in5);//测试用的，得到初始化0级父节点，应该从数据库中获取。
    try {
     convertListToJson(list);
    } catch (Exception e) {
     e.printStackTrace();
    }
   }else{//根据父节点id加载对应的子节点
    List<Inner> list = getChilds(Integer.valueOf(id));//通过父id取得子节点集合，测试就自己写个方法，应该从数据库中获取。
    try {
     convertListToJson(list);
    } catch (Exception e) {
     e.printStackTrace();
    }
   }
  }

public class Inner{
  private Integer id; 
  private Integer pId; //指向父节点id
  private String name; //显示的内容 
  private String isParent;//是否是父节点
  public Inner(){
   this.isParent="false";
  }
  public String getIsParent() {
   return isParent;
  }
  public void setIsParent(String isParent) {
   this.isParent = isParent;
  }
  public Integer getpId() {
   return pId;
  }
  public void setpId(Integer pId) {
   this.pId = pId;
  }
  public Integer getId() {
   return id;
  }
  public void setId(Integer id) {
   this.id = id;
  }
  public String getName() {
   return name;
  }
  public void setName(String name) {
   this.name = name;
  }
}

// -- 将运行结果用json字符返回客户端
 public void convertListToJson(List<?> list)throws Exception{
   JSONArray json = JSONArray.fromObject(list); 
   response.setHeader("Cache-Control", "no-cache");
   response.setContentType("text/html; charset=UTF-8"); 
   PrintWriter writer;
   writer = response.getWriter();
   writer.write(json.toString());
   writer.close();
 }

public List<Inner> getTrees(){
  Inner in=new Inner();
  in.setId(1);
  in.setpId(0);
  in.setIsParent("true");
  in.setName("父节点1");
  Inner in1=new Inner();
  in1.setId(2);
  in1.setpId(1);
  in1.setName("子节点11");
  in1.setIsParent("true");
  Inner in2=new Inner();
  in2.setId(3);
  in2.setpId(1);
  in2.setName("子节点12");
  Inner in3=new Inner();
  in3.setId(4);
  in3.setpId(2);
  in3.setName("子节点111");
  Inner in4=new Inner();
  in4.setId(5);
  in4.setpId(0);
  in4.setIsParent("true");
  in4.setName("父节点2");
  Inner in5=new Inner();
  in5.setId(6);
  in5.setpId(5);
  in5.setName("子节点21");
  List<Inner> list=new ArrayList<Inner>();
  list.add(in);
  list.add(in1);
  list.add(in2);
  list.add(in3);
  list.add(in4);
  list.add(in5);
  return list;
 }
 public Inner getById(Integer id){
  List<Inner> list = getTrees();
  for (Inner inner : list) {
   if(id==inner.getId()){
    Inner in=inner;
    return in;
   }
  }
  return null;
 }
 public List<Inner> getChilds(Integer id){
  List<Inner> list = getTrees();
  List<Inner> result =new ArrayList<OmRequestImpl.Inner>();
  for (Inner inner : list) {
   if(id.intValue()==inner.getpId().intValue()){
    result.add(inner);
   }
  }
  return result;
 }