jquery中EasyUI实现异步树

前台使用EasyUI实现 . EasyUI向后台传递一个id参数 .

第一次加载 , 向后台传递的id为null .

之后每次将树节点展开 , 会向后台传递一个当前节点的 id .

Control层 :

/**

  * tree

  */

 @RequestMapping(value = "/tree.do")

 public void mytree(HttpServletResponse response, String id) {

  this.writeJson(response, bookService.getChildrenTree(id));

 }

Service层 :

@Transactional

 @Override

 public List<Tree> getChildrenTree(String pid) {

  try {

   List<Tree> result = new ArrayList<Tree>();

   //获得儿子节点的列表

   List<TBookType> childrenList = this.getChildrenType(pid);

   if (childrenList != null && childrenList.size() > 0) {

    for (TBookType child : childrenList) {

     // 获取孙子的个数

     long count = bookDao.getChildrenCount(String.valueOf(child.getId()));

     Tree node = new Tree();

     node.setId(String.valueOf(child.getId()));

     node.setPid(String.valueOf(child.getPid()));

     node.setText(child.getName());

     node.setChildren(null);

     node.setState(count > 0 ? "closed" : "open");

     //将儿子列表childrenList数据逐个存到树当中

     result.add(node);

    }

   }

    return result; 

  } catch (Exception e) {

   throw new BusinessException("获取图书类型数据出现错误！", e);

  }

 }

Dao层 :

@Override

 public List<TBookType> getChildrenType(String pid) {

 //这个的pid就是当前展开节点的id , 通过父节点的 id 来获得子节点

 StringBuilder sqlstr = new StringBuilder();

  if (StringUtils.isBlank(pid))

   sqlstr.append("select * from booktype bt where bt.pid=0");

  else

   sqlstr.append("select * from booktype bt where bt.pid=" + pid );

  return this.search2(TBookType.class, sqlstr.toString());

 }

@Override

 public long getChildrenCount(String pid) {

 //这个的pid就是当前展开节点的id , 通过父节点的 id 来获得子节点的个数

  StringBuilder sqlstr = new StringBuilder();

  if (StringUtils.isBlank(pid))

   sqlstr.append("select count(*) from booktype tb where tb.pid='0'");

  else

   sqlstr.append("select count(*) from booktype tb where tb.pid='" + pid + "'");

  return this.count(sqlstr.toString());

 }

以上所述就是本文关于EasyUI实现异步树的全部代码了，希望对大家能有所帮助