zTree树形插件异步加载方法详解

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本文实例为大家分享了zTree树形插件异步加载，Struts2框架，供大家参考，具体内容如下

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>异步加载</title>
<link rel="stylesheet"
  href="${pageContext.request.contextPath}/zTree_v3-master/css/demo.css">
<link rel="stylesheet"
  href="${pageContext.request.contextPath}/zTree_v3-master/css/zTreeStyle/zTreeStyle.css">
<script type="text/javascript"
  src="${pageContext.request.contextPath}/jquery-2.1.1.min.js"></script>
<script type="text/javascript"
  src="${pageContext.request.contextPath}/zTree_v3-master/js/jquery.ztree.core.min.js"></script>
<script type="text/javascript">
  var setting = {
    async : {
      enable : true,
      url : "${pageContext.request.contextPath}/ztreeAction!getMenusById.jhtml",
      autoParam : [ "id" ],
    //dataFilter : filter
    },
    data : {
      key : {
        url : "xUrl"
      },
      simpleData : {
        enable : true,
        pIdKey : "pid"
      }
    },

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



</head>
<body>
  <div class="ztree"
    style="width: 20%; height: 500px; padding-top: 10px; float: left; border: 1px solid #FF0000;">
    <ul id="treeDemo"></ul>
  </div>

</body>
</html>

上面呢，是jsp页面的代码，因为是纯插件测试，可以直接复制过去使用的，

action层代码，可以直接复制使用

public void getMenusById(){
    List<Ztree> list=null;
    try {
      list=ztreeService.getMenusById(ztree);
    } catch (Exception e) {
      e.printStackTrace();
    }
    super.writeJson(list);
}

public List<Ztree> getMenusById(Ztree ztree) throws Exception;
//接口

//service代码，几本都可以复制使用


package com.jk.service.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.jk.dao.ZtreeDao;
import com.jk.model.Ztree;
import com.jk.service.ZtreeService;
@Repository("ztreeService")
public class ZtreeServiceImpl implements ZtreeService {
  
  @Autowired
  private ZtreeDao ztreeDao;

  @Override
  public List queryList(Ztree ztree) throws Exception {
    String hql=" from Ztree where 1=1 ";
    Map<String, Object> params = new HashMap<String, Object>();
//传的对象是否为空，拼接sql+id
      if(ztree.getId()!=null){
        hql+=" and id = :id ";
        params.put("id",ztree.getId());
      }
    
    
    return ztreeDao.queryList(hql, params);
  }
  //递归查询
  @Override
  public List<Ztree> getMenusById(Ztree ztree) throws Exception {
    String hql=" from Ztree where 1=1 ";
    Map<String,Object> params=new HashMap<String,Object>();
    if(ztree.getId()==null||ztree.getId().equals("")){
      hql+=" and pid is null ";
    }else{
      hql+= " and pid = :id ";
      params.put("id",ztree.getId());
    }
    List<Ztree> queryZtree = ztreeDao.queryList(hql, params);
    List<Ztree> list=new ArrayList<Ztree>();
    for(Ztree ztree2:queryZtree){
      if(queryBoolean(ztree2)){
        ztree2.setIsParent("true");
      }
      list.add(ztree2);
    }
    return list;
  }
  //熟悉递归的朋友应该可以看懂，我就不解释了，我也聊不清楚这个递归，不误导了，代码在这，可以复制进去直接运行，
  public boolean queryBoolean(Ztree ztree) throws Exception{
    boolean flag=false;
    String hql= " from Ztree where pid = :id ";
    
    Map<String,Object> params=new HashMap<String,Object>();
    params.put("id", ztree.getId());
    List<Ztree> queryZtree = ztreeDao.queryList(hql, params);
    if(queryZtree!=null&&queryZtree.size()>0){
      flag=true;
    }
    return flag;
  }

  
}

dao层就不用写了吧，只是一个查询，下面我把ztree的表字段附上