本文实例讲述了jstree创建无限分级树的方法。分享给大家供大家参考，具体如下：
首先来看一下效果
页面加载之初
节点全部展开后
首先数据库的表结构如下
其中Id为主键,PId为关联到自身的外键
两个字段均为GUID形式
层级关系主要靠这两个字段维护
其次需要有一个类型
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public class MenuType
{
public Guid Id { get; set; }
public Guid PId { get; set; }
public string MenuName { get; set; }
public string Url { get; set; }
public int OrderNum { get; set; }
public int SonCount { get; set; }
}
SonCount
这个属性用来记录当前节点的子节点的个数
注意：也可以把此属性放在数据库中，性能上会提升一些，但需要增加额外的代码来维护此字段
接下来看一下取数据的方式
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protected void Page_Load(object sender,EventArgs e)
{
if (Request["Action"] == "AJAX")
{
var result = GetMenu(Request["pid"]);
JavaScriptSerializer serializer = new JavaScriptSerializer();
string sRet = serializer.Serialize(result);
Response.Write(sRet);
Response.End();
}
}
其中请求参数pid为客户端需要获取的节点ID
如果请求顶级节点，则此参数的值为00000000-0000-0000-0000-000000000000
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private List GetMenu(string pid)
{
var result = new List();
sqlConnection conn = new sqlConnection("Data Source=.;Initial Catalog=SHU;User ID=sa;Password=allen;");
conn.open();
sqlCommand cmd = new sqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select a.*,b.cout as count from Menu a left join (select COUNT(*) as cout,Menu.PId from Menu group by Menu.PId) as b on a.Id = b.PId where a.PId = '" + pid + "' order by OrderNum";
sqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
while (dr.Read())
{
var obj = new MenuType();
obj.Id =Guid.Parse(dr["Id"].ToString());
obj.MenuName = dr["MenuName"].ToString();
obj.OrderNum = Convert.ToInt32(dr["OrderNum"]);
obj.PId = dr["PId"] == dbnull.Value ? Guid.Empty : Guid.Parse(dr["PId"].ToString());
obj.Url = dr["Url"].ToString();
obj.sonCount = dr["count"] == dbnull.Value ? 0 : Convert.ToInt32(dr["count"]);
result.Add(obj);
}
return result;
}
在本DEMO中使用JavaScriptSerializer来序列化菜单数组
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