ASP.NET tree implementation code based on JQuery_jquery

The data of this tree is extracted from the sql table. The structure of the sql table is as follows:

In the above table, parentmodeuleID is a sign representing the parent ID. If the current node is the root node, it is specified as 0.

Then the next step is how to form a tree structure with the above single table. At this time, we can use IList to load database models to achieve this. The specific Tree class is as follows:

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; }

  
 }
}

Then the database data is organized on the public processing page to form a json format that conforms to jquery tree. The specific code is as follows:

[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;
  }

The above is to use recursion to combine database data into appropriate json data. The database operation code used is as follows:

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;
  }

 }
}

Okay, after the json data is processed, you can hit the json to the front desk and hand it over to jquery for processing,

<%@ 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>

Okay, let’s take a look at the loading results:

Things to pay attention to during the production process are: first, the recursion must be correct; secondly, pay attention to the js capitalization ('ChildNodes' was written as 'childNodes' by me, and it took me a day to adjust it); thirdly, the public page can be called directly method, just add the [webmethod] mark in front of the method.