extjs 实现右击菜单功能

1）default.aspx前台代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ExtjsTreeDemo._Default" %>



    
    
    
    
    


    

    

    
    
    

2）GetTrees.ashx 代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Text;
using System.Configuration;
namespace ExtjsTreeDemo.ServletHandlers
{
    /// 

    /// $codebehindclassname$ 的摘要说明
    /// 
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class GetTrees : IHttpHandler
    {
        private string TreeDemoConnectionString = ConfigurationManager.ConnectionStrings["TreeDemoConnectionString"].ConnectionString;
        DataClassesDataContext dc = null;
        public void ProcessRequest(HttpContext context)
        {
            dc = new DataClassesDataContext(TreeDemoConnectionString);
            string str = GetParentNodeString(0);
            context.Response.ContentType = "text/plain";
            context.Response.Write(str);
        }
        /// 

        /// 获取父节点
        /// 
        /// 
        private string GetParentNodeString(int id)
        {
            int counter= 1;
            IQueryable nodes=dc.TreeNodes.Where(u=>u.parentId==id);
            StringBuilder sb = new StringBuilder();
            if (nodes != null && nodes.Count() != 0)
            {
                sb.Append("[");
                foreach (TreeNodes node in nodes)
                {
                    sb.Append("{");
                    sb.Append("id:'" + node.id + "'");
                    sb.Append(",text:'" + node.text + "'");
                    sb.Append(GetSubNodeString(node.id));
                    sb.Append("}");
                    if (counter < nodes.Count())
                    {
                        sb.Append(",");
                    }
                    counter++;
                }
                sb.Append("]");
            }
            return sb.ToString();
        }
        /// 

        /// 获取子节点
        /// 
        /// 
        /// 
        private string GetSubNodeString(int id)
        {
            int counter = 1;
            IQueryable nodes = dc.TreeNodes.Where(u => u.parentId == id);
            StringBuilder sb = new StringBuilder();
            if (nodes != null & nodes.Count() != 0)
            {
                sb.Append(",children: [");
                foreach (TreeNodes node in nodes)
                {
                    sb.Append("{");
                    sb.Append("id:'" + node.id + "'");
                    sb.Append(",text:'" + node.text + "'");
                    sb.Append(GetSubNodeString(node.id));
                    sb.Append("}");
                    if (counter < nodes.Count())
                    {
                        sb.Append(",");
                    }
                    counter++;
                }
                sb.Append("]");
            }
            else
            {
                sb.Append(",leaf: true");
                //sb.Append(",href:'http://www.baidu.com?id="+id+"'");
                //sb.Append(",hrefTarget:'_blank'");
            }
            return sb.ToString();
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

3）TreeHandler.ashx代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Configuration;
using System.Data.Linq;
namespace ExtjsTreeDemo.ServletHandlers
{
    /// 

    /// $codebehindclassname$ 的摘要说明
    /// 
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class TreeHandler : IHttpHandler
    {
        private string TreeDemoConnectionString = ConfigurationManager.ConnectionStrings["TreeDemoConnectionString"].ConnectionString;
        DataClassesDataContext dc = null;
        public void ProcessRequest(HttpContext context)
        {
            dc = new DataClassesDataContext(TreeDemoConnectionString);
            string type = "";
            int parentId = 0;
            string text = "";
            if (context.Request.QueryString["type"] != null)
            {
                type = context.Request.QueryString["type"].ToString();
            }
            if (context.Request.QueryString["parentId"] != null)
            {
                string strId = context.Request.QueryString["parentId"].ToString();
                parentId = Convert.ToInt32(strId);
            }
            if (context.Request.QueryString["text"] != null)
            {
                text = context.Request.QueryString["text"].ToString();
            }
            if (type == "add")
            {
                TreeNodes node = new TreeNodes();
                node.text = text;
                node.parentId = parentId;
                bool flag = AddNode(node);
            }
            else if (type == "del")
            {
                TreeNodes node = GetNode(parentId);
                if (node != null)
                {
                    bool flag = DelNode(node);
                    DelNodesEvent(parentId);
                }
            }
            else
            {
                TreeNodes node = GetNode(parentId);
                bool flag = EditNode(node, text);
            }
            context.Response.ContentType = "text/plain";
            context.Response.Write("response");
            
        }
        /// 

        /// 递归删除所有的字节点
        /// 
        /// 
        private void DelNodesEvent(int parentId)
        {
            IQueryable nodes = GetNodes(parentId);
            if (nodes != null && nodes.Count() != 0)
            {
                foreach (TreeNodes node in nodes)
                {
                    DelNodesEvent(node.id);
                }
                DelNodes(nodes);
            }
        }
        /// 

        /// 根据id获取节点
        /// 
        /// 
        /// 
        private TreeNodes GetNode(int id)
        {
            TreeNodes node = null;
            node=dc.TreeNodes.SingleOrDefault(u => u.id == id);
            return node;
        }
        /// 

        /// 根据parentId删除多个节点
        /// 
        /// 
        /// 
        private IQueryable GetNodes(int parentId)
        {
            IQueryable nodes = null;
            nodes = dc.TreeNodes.Where(u => u.parentId == parentId);
            return nodes;
        }
        /// 

        /// 添加节点
        /// 
        /// 
        /// 
        private bool AddNode(TreeNodes node)
        {
            bool flag = false;
            try
            {
                dc.TreeNodes.InsertOnSubmit(node);
                dc.SubmitChanges();
                flag = true;
            }
            catch (Exception ex)
            {
                flag = false;
            }
            return flag;
        }
        /// 

        /// 删除节点
        /// 
        /// 
        /// 
        private bool DelNode(TreeNodes node)
        {
            bool flag = false;
            try
            {
                dc.TreeNodes.DeleteOnSubmit(node);
                dc.SubmitChanges();
            }
            catch (Exception ex)
            {
                flag = false;
            }
            return flag;
        }
        /// 

        /// 删除多个节点
        /// 
        /// 
        /// 
        private bool DelNodes(IQueryable nodes)
        {
            bool flag = false;
            try
            {
                dc.TreeNodes.DeleteAllOnSubmit(nodes);
                dc.SubmitChanges();
            }
            catch (Exception ex)
            {
                flag = false;
            }
            return flag;
        }
        /// 

        /// 修改
        /// 
        /// 
        /// 
        /// 
        private bool EditNode(TreeNodes node, string text)
        {
            bool flag = false;
            node.text = text;
            try
            {
                dc.SubmitChanges();
                flag = true;
            }
            catch (Exception ex)
            {
                flag = false;
            }
            return flag;
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}