基于JQuery的asp.net树实现代码

2019-11-21 00:04:43

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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: