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首页 / 脚本样式 / JavaScript / 基于JQuery的asp.net树实现代码

本tree的数据从sql的表中提取而来,sql表的结构如下:

上面的表中  parentmodeuleID是代表父ID的标志,如果当前节点为根节点,则规定为0. 
然后就是如何将上面的单表来组成树状结构.这时我们可以利用IList来加载数据库models来实现,具体Tree类如下:

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;namespace RolePermission1{ public class Tree {public int ModuleID { get; set; }public int ParentID { get; set; }public string ModulePath { get; set; }public string ModuleName { get; set; } }}
然后就是在公共处理页面,将数据库的数据进行组织,形成符合jquery tree的json格式,具体代码如下:

[WebMethod]public static string GetJson(){ string json = "["; IList<Tree> t = DB.returnParentTree(); foreach (Tree model in t) {if (model != t[t.Count - 1]){ json += GetJsonByModel(model) + ",";}else{ json += GetJsonByModel(model);} } json += "]"; json=json.Replace(""","""); return json;}public static string GetJsonByModel(Tree t){ string json = ""; bool flag = DB.isHaveChild(t.ModuleID); json = "{"+ ""id":"" + t.ModuleID + "","+ ""text":"" + t.ModuleName + "","+ ""value":"" + t.ModuleID + "","+ ""showcheck":true,"+ ""checkstate":"0","+ ""hasChildren":" + flag.ToString().ToLower() + ","+ ""isexpand":false,"+ ""ChildNodes":"; /*奶奶的,这个地方一定要注意是ChildNodes 而不是childNodes 害得我无语了*/ if (!flag) {json += "null,";json += ""complete":false}"; } else {json += "[";IList<Tree> list = DB.getChild(t.ModuleID);foreach (Tree tree in list){ if (tree != list[list.Count - 1]) {json += GetJsonByModel(tree) + ","; } else {json += GetJsonByModel(tree); }}json += "],"complete":true}"; } return json;}
上面就是利用递归的方式来将数据库的数据组合成合适的json数据,利用到的数据库操作类代码如下:

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Data;using System.Data.SqlClient;namespace RolePermission1{ public class DB {public static readonly string connStr=System.Configuration.ConfigurationManager.AppSettings["connStr"];public static SqlConnection GetConn(){ SqlConnection conn = new SqlConnection(connStr); conn.Open(); return conn;}public static DataTable GetDT(string sql){ DataTable dt = new DataTable(); using (SqlConnection conn = DB.GetConn()) {SqlDataAdapter sda = new SqlDataAdapter(sql, conn);sda.Fill(dt); } return dt;}public static IList<Tree> returnParentTree(){ IList<Tree> t = new List<Tree>(); string sql = "select * from Models where [ParentModuleID]=0 order by OrderBy asc"; DataTable dt = GetDT(sql); foreach (DataRow dr in dt.Rows) {Tree tParent = new Tree();tParent.ModuleID = Int32.Parse(dr["ID"].ToString());tParent.ModuleName = dr["ModuleName"].ToString();tParent.ModulePath = dr["MenuPath"].ToString();tParent.ParentID = Int32.Parse(dr["ParentModuleID"].ToString());t.Add(tParent); } return t;}public static bool isHaveChild(int id){ bool flag=false; string sql = "select ID from Models where ParentModuleID="+id+""; DataTable dt = GetDT(sql); if (dt.Rows.Count > 0) {flag = true; } return flag; }public static IList<Tree> getChild(int id){ IList<Tree> t = new List<Tree>(); string sql = "select * from Models where ParentModuleID=" + id + ""; DataTable dt = GetDT(sql); foreach (DataRow dr in dt.Rows) {Tree tParent = new Tree();tParent.ModuleID = Int32.Parse(dr["ID"].ToString());tParent.ModuleName = dr["ModuleName"].ToString();tParent.ModulePath = dr["MenuPath"].ToString();tParent.ParentID = Int32.Parse(dr["ParentModuleID"].ToString());t.Add(tParent); } return t;} }}
好了,当json数据处理好以后,就可以将json打到前台,交给jquery来处理了,

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="RolePermission1._Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title></title> <script src="jquery.treeview/lib/jquery.js" type="text/javascript"></script> <link href="jquery.treeview/tree.css" rel="stylesheet" type="text/css" /> <script src="jquery.treeview/common.js" type="text/javascript"></script> <script src="jquery.treeview/jquery.tree.js" type="text/javascript"></script></head><body> <form id="form1"><button id="showchecked" runat="server">Get Selected Nodes</button> <div id="showTree" class="filetree"> </div> </form></body> <script type="text/javascript">$(document).ready(function() {$.ajax({ type: "post", contentType: "application/json;charset=utf-8", dataType: "json", url: "WebForm1.aspx/GetJson", success: function(data) {var o = { showcheck: true };o.data = eval(data.d);$("#showTree").treeview(o); } }); }); $("#showchecked").click(function(e) {var s = $("#showTree").getTSVs();if (s != null) alert(s.join(","));else alert("NULL"); }); </script></html>
好了,来看看加载结果吧:



制作过程中需要注意的是:首先,递归必须正确;其次注意js大小写("ChildNodes"被我写成了"childNodes",花费了我一天时间才调整过来 晕哦) 再者就是可以直接调用公共页面的方法,只要在方法前面加上[webmethod]标记即可.