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"> </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.