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;
  }