EasyUI Tree+Asp.net实现权限树或目录树导航

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Main.aspx.cs" Inherits="Manage_Main" %>




    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    

      
      

        
        
          
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<%@ WebHandler Language="C#" Class="GetTreeDataFromDB" %>

using System;
using System.Web;
using System.Configuration;
using System.Data;
using System.Text;
using System.Collections.Generic;
//add
using System.Web.Script.Serialization;

public class GetTreeDataFromDB : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";

        //获取数据库中的分类数据
        string fatherid = context.Request.QueryString["father"];
        DataTable dt = createDT();

        string json = GetTreeJsonByTable(dt, "module_id", "module_name","module_url", "module_fatherid", "0");
        context.Response.Write(json);
        context.Response.End();        
    }

    #region 根据DataTable生成EasyUI Tree Json树结构
    StringBuilder result = new StringBuilder();
    StringBuilder sb = new StringBuilder();    
    /// 

    /// 根据DataTable生成EasyUI Tree Json树结构
    /// 
    /// 数据源
    /// ID列
    /// Text列
    /// 节点Url
    /// 关系字段
    /// 父ID
    private string GetTreeJsonByTable(DataTable tabel, string idCol, string txtCol, string url, string rela, object pId)
    {
        result.Append(sb.ToString());
        sb.Clear();
        if (tabel.Rows.Count > 0)
        {
            sb.Append("[");
            string filer = string.Format("{0}='{1}'", rela, pId);
            DataRow[] rows = tabel.Select(filer);
            if (rows.Length > 0)
            {
                foreach (DataRow row in rows)
                {
                    sb.Append("{\"id\":\"" + row[idCol] + "\",\"text\":\"" + row[txtCol] + "\",\"attributes\":\"" + row[url] + "\",\"state\":\"open\"");
                    if (tabel.Select(string.Format("{0}='{1}'", rela, row[idCol])).Length > 0)
                    {
                        sb.Append(",\"children\":");
                        GetTreeJsonByTable(tabel, idCol, txtCol,url, rela, row[idCol]);
                        result.Append(sb.ToString());
                        sb.Clear();
                    }
                    result.Append(sb.ToString());
                    sb.Clear();
                    sb.Append("},");
                }
                sb = sb.Remove(sb.Length - 1, 1);
            }
            sb.Append("]");
            result.Append(sb.ToString());
            sb.Clear();
        }
        return result.ToString();
    }
    #endregion 


    #region 创建数据
    protected static DataTable createDT()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("module_id");
        dt.Columns.Add("module_name");
        dt.Columns.Add("module_fatherid");
        dt.Columns.Add("module_url");
        dt.Columns.Add("module_order");

        dt.Rows.Add("C1", "全国", "0", "1.aspx", "1");
        dt.Rows.Add("M01", "广东", "C1", "2.aspx", "1");

        dt.Rows.Add("M0101", "深圳", "M01", "3.aspx", "100");
        dt.Rows.Add("M010101", "南山区", "M0101", "4.aspx", "1000");
        dt.Rows.Add("M010102", "罗湖区", "M0101", "", "1001");
        dt.Rows.Add("M010103", "福田区", "M0101", "", "1002");
        dt.Rows.Add("M010104", "宝安区", "M0101", "", "1003");
        dt.Rows.Add("M010105", "龙岗区", "M0101", "", "1004");

        dt.Rows.Add("M01010301", "上梅林", "M010103", "", "1002001");
        dt.Rows.Add("M01010302", "下梅林", "M010103", "", "1002002");
        dt.Rows.Add("M01010303", "车公庙", "M010103", "", "1002003");
        dt.Rows.Add("M01010304", "竹子林", "M010103", "", "1002004");
        dt.Rows.Add("M01010305", "八卦岭", "M010103", "", "1002005");
        dt.Rows.Add("M01010306", "华强北", "M010103", "", "1002006");

        dt.Rows.Add("M0102", "广州", "M01", "", "101");
        dt.Rows.Add("M010201", "越秀区", "M0102", "", "1105");
        dt.Rows.Add("M010202", "海珠区", "M0102", "", "1106");
        dt.Rows.Add("M010203", "天河区", "M0102", "", "1107");
        dt.Rows.Add("M010204", "白云区", "M0102", "", "1108");
        dt.Rows.Add("M010205", "黄埔区", "M0102", "", "1109");
        dt.Rows.Add("M010206", "荔湾区", "M0102", "", "1110");
        dt.Rows.Add("M010207", "罗岗区", "M0102", "", "1111");
        dt.Rows.Add("M010208", "南沙区", "M0102", "", "1112");
        return dt;
    }
    #endregion


    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

    #region 根据DataTable生成EasyUI Tree Json树结构  
    StringBuilder result = new StringBuilder();  
    StringBuilder sb = new StringBuilder();      
    /// 
  
    /// 根据DataTable生成EasyUI Tree Json树结构  
    /// 
  
    /// 数据源  
    /// ID列  
    /// Text列  
    /// 节点Url  
    /// 关系字段  
    /// 父ID  
    private string GetTreeJsonByTable(DataTable tabel, string idCol, string txtCol, string url, string rela, object pId)  
    {  
        result.Append(sb.ToString());  
        sb.Clear();  
        if (tabel.Rows.Count > 0)  
        {  
            sb.Append("[");  
            string filer = string.Format("{0}='{1}'", rela, pId);  
            DataRow[] rows = tabel.Select(filer);  
            if (rows.Length > 0)  
            {  
                foreach (DataRow row in rows)  
                {  
                    sb.Append("{\"id\":\"" + row[idCol] + "\",\"text\":\"" + row[txtCol] + "\",\"attributes\":\"" + row[url] + "\"");  
                    if (tabel.Select(string.Format("{0}='{1}'", rela, row[idCol])).Length > 0)  
                    {  
                        //点击展开
                        sb.Append(",\"state\":\"closed\",\"children\":");  
                        GetTreeJsonByTable(tabel, idCol, txtCol,url, rela, row[idCol]);  
                        result.Append(sb.ToString());  
                        sb.Clear();  
                    }  
                    result.Append(sb.ToString());  
                    sb.Clear();  
                    sb.Append("},");  
                }  
                sb = sb.Remove(sb.Length - 1, 1);  
            }  
            sb.Append("]");  
            result.Append(sb.ToString());  
            sb.Clear();  
        }  
        return result.ToString();  
    }  
    #endregion   

转载于:https://www.cnblogs.com/smartsmile/archive/2013/01/12/6234330.html