ASP.NET JS+Sql无限级树型菜单

功能说明：

由Tree.html中的JQuery AJAX代码发起HTTP请求到GetTreeData.aspx获取JSON格式的字符串，然后在Tree.html中将字符串格式化为JSON格式，用dTree函数递归构造JS Tree。

步骤：

1）创建Menu类（为了构造List<T>泛型集合）

2）创建FormatToJson类

3）创建GetTreeData.aspx窗体，添加后台实现代码

4）创建Tree.html，并处理数据递归绑定Tree

1、Tree.html

[xhtml] view plain copy print ?

<!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>
<title></title>
<mce:script type="text/javascript" src="Scripts/dtree.js" mce_src="Scripts/dtree.js"></mce:script>
<mce:script type="text/javascript" src="Scripts/jquery-1.4.1.js" mce_src="Scripts/jquery-1.4.1.js"></mce:script>
<mce:script type="text/javascript"><!--
d = new dTree('d');
d.add(0, -1, '模块列表');
function getData(id) {
$.ajax({
url: 'TreeSource/GetTreeData.aspx?parentID=' + id,
type: 'post',
datatype: 'json',
success: function (returnJsonValue) {
if (returnJsonValue.length > 0) {
//格式化为JSON数据格式
var json = eval("(" + returnJsonValue + ")");
//document.write(json.Menu[0].MenuName);
//遍历集合，添加树节点
$.each(json.Menu, function (key, value) {
if (id == 0) {
d.add(value.ID, value.ParentMenuID, value.MenuName, value.MenuClickURL, value.MenuName, 'mainFrame', 'images/Tree/folder.gif', 'images/Tree/folderopen.gif');
}
else {
d.add(value.ID, value.ParentMenuID, value.MenuName, value.MenuClickURL, value.MenuName, 'mainFrame');
}
//根据模块的ParentID递归绑定数据
getData(value.ID);
})
}
else {
$("#divTree").html(d.toString());
//数据请求完毕，隐藏图片
$("#imgLoading").hide();
}
}
})
}
$(getData(0));
// --></mce:script>
<mce:style type="text/css"><!--
img
{
border:0px;
}
--></mce:style><style type="text/css" mce_bogus="1"> img
{
border:0px;
}
</style>
</head>
<body>
<img id="imgLoading" src="Images/Loading/loading01.gif" mce_src="Images/Loading/loading01.gif" alt="正在加载..." />
<div id="divTree">
</div>
</body>
</html>

2、请求数据的ASP.NET网页后台代码（前台清空就剩Page命令那一行就可以了）

[c-sharp] view plain copy print ?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DAO;
using System.Data;
using System.Text;
using System.Reflection;
public partial class TreeSource_GetTreeData : System.Web.UI.Page
{
SqlHelper helper = new SqlHelper();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.GetMenuByParentID();
}
}
private void GetMenuByParentID()
{
if (ParentID != null)
{
DataTable dt = helper.FillDataTable(String.Format(
"SELECT * FROM SunZonTMSMenu WHERE ParentMenuID={0} AND IsOpen=1", ParentID.ToString()
));
IList<Menu> menu = new List<Menu>();
if (dt != null && dt.Rows.Count > 0)
{
foreach (DataRow dr in dt.Rows)
{
menu.Add(new Menu() {
ID=Int32.Parse(dr["ID"].ToString()),
ParentMenuID = Int32.Parse(dr["ParentMenuID"].ToString()),
MenuName = dr["MenuName"].ToString(),
MenuCode = dr["MenuCode"].ToString(),
MenuClickURL = dr["MenuClickURL"].ToString()
});
}
}
if (menu.Count > 0)
{
Response.Write(FormatToJson.ListToJson<Menu>(menu));
}
}
}
//上级Menu的ID
private Int32? ParentID
{
get
{
try
{
return Int32.Parse(Request.QueryString["parentID"]);
}
catch
{
return null;
}
}
}
}

3、使用到的Menu实体类

[c-sharp] view plain copy print ?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
/// <summary>
/// Summary description for Menu
/// </summary>
public class Menu
{
public Menu()
{
//
// TODO: Add constructor logic here
//
}
public int ID { get; set; }
public int ParentMenuID { get; set; }
public string MenuName { get; set; }
public string MenuCode { get; set; }
public string MenuClickURL { get; set; }
}

4、使用的构造JSON数据格式的类（此类不是本人写的，来源于互联网）

[c-sharp] view plain copy print ?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Reflection;
using System.Collections;
using System.Data;
using System.Data.Common;
/// <summary>
/// Summary description for FormatToJson
/// </summary>
public class FormatToJson
{
public FormatToJson()
{
//
// TODO: Add constructor logic here
//
}
/// <summary>
/// List转成json
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="jsonName"></param>
/// <param name="list"></param>
/// <returns></returns>
public static string ListToJson<T>(IList<T> list, string jsonName)
{
StringBuilder Json = new StringBuilder();
if (string.IsNullOrEmpty(jsonName))
jsonName = list[0].GetType().Name;
Json.Append("{/"" + jsonName + "/":[");
if (list.Count > 0)
{
for (int i = 0; i < list.Count; i++)
{
T obj = Activator.CreateInstance<T>();
PropertyInfo[] pi = obj.GetType().GetProperties();
Json.Append("{");
for (int j = 0; j < pi.Length; j++)
{
Type type = pi[j].GetValue(list[i], null).GetType();
Json.Append("/"" + pi[j].Name.ToString() + "/":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));
if (j < pi.Length - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < list.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}
/// <summary>
/// List转成json
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <returns></returns>
public static string ListToJson<T>(IList<T> list)
{
object obj = list[0];
return ListToJson<T>(list, obj.GetType().Name);
}
/// <summary>
/// 对象转换为Json字符串
/// </summary>
/// <param name="jsonObject">对象</param>
/// <returns>Json字符串</returns>
public static string ToJson(object jsonObject)
{
string jsonString = "{";
PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
for (int i = 0; i < propertyInfo.Length; i++)
{
object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
string value = string.Empty;
if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
{
value = "'" + objectValue.ToString() + "'";
}
else if (objectValue is string)
{
value = "'" + ToJson(objectValue.ToString()) + "'";
}
else if (objectValue is IEnumerable)
{
value = ToJson((IEnumerable)objectValue);
}
else
{
value = ToJson(objectValue.ToString());
}
jsonString += "/"" + ToJson(propertyInfo[i].Name) + "/":" + value + ",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
return jsonString + "}";
}
/// <summary>
/// 对象集合转换Json
/// </summary>
/// <param name="array">集合对象</param>
/// <returns>Json字符串</returns>
public static string ToJson(IEnumerable array)
{
string jsonString = "[";
foreach (object item in array)
{
jsonString += ToJson(item) + ",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
return jsonString + "]";
}
/// <summary>
/// 普通集合转换Json
/// </summary>
/// <param name="array">集合对象</param>
/// <returns>Json字符串</returns>
public static string ToArrayString(IEnumerable array)
{
string jsonString = "[";
foreach (object item in array)
{
jsonString = ToJson(item.ToString()) + ",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
return jsonString + "]";
}
/// <summary>
/// Datatable转换为Json
/// </summary>
/// <param name="table">Datatable对象</param>
/// <returns>Json字符串</returns>
public static string ToJson(DataTable dt)
{
StringBuilder jsonString = new StringBuilder();
jsonString.Append("[");
DataRowCollection drc = dt.Rows;
for (int i = 0; i < drc.Count; i++)
{
jsonString.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
string strKey = dt.Columns[j].ColumnName;
string strValue = drc[i][j].ToString();
Type type = dt.Columns[j].DataType;
jsonString.Append("/"" + strKey + "/":");
strValue = StringFormat(strValue, type);
if (j < dt.Columns.Count - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append("},");
}
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
return jsonString.ToString();
}
/// <summary>
/// DataTable转成Json
/// </summary>
/// <param name="jsonName"></param>
/// <param name="dt"></param>
/// <returns></returns>
public static string ToJson(DataTable dt, string jsonName)
{
StringBuilder Json = new StringBuilder();
if (string.IsNullOrEmpty(jsonName))
jsonName = dt.TableName;
Json.Append("{/"" + jsonName + "/":[");
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Json.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
Type type = dt.Rows[i][j].GetType();
Json.Append("/"" + dt.Columns[j].ColumnName.ToString() + "/":" + StringFormat(dt.Rows[i][j].ToString(), type));
if (j < dt.Columns.Count - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < dt.Rows.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}
/// <summary>
/// DataReader转换为Json
/// </summary>
/// <param name="dataReader">DataReader对象</param>
/// <returns>Json字符串</returns>
public static string ToJson(DbDataReader dataReader)
{
StringBuilder jsonString = new StringBuilder();
jsonString.Append("[");
while (dataReader.Read())
{
jsonString.Append("{");
for (int i = 0; i < dataReader.FieldCount; i++)
{
Type type = dataReader.GetFieldType(i);
string strKey = dataReader.GetName(i);
string strValue = dataReader[i].ToString();
jsonString.Append("/"" + strKey + "/":");
strValue = StringFormat(strValue, type);
if (i < dataReader.FieldCount - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append("},");
}
dataReader.Close();
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
return jsonString.ToString();
}
/// <summary>
/// DataSet转换为Json
/// </summary>
/// <param name="dataSet">DataSet对象</param>
/// <returns>Json字符串</returns>
public static string ToJson(DataSet dataSet)
{
string jsonString = "{";
foreach (DataTable table in dataSet.Tables)
{
jsonString += "/"" + table.TableName + "/":" + ToJson(table) + ",";
}
jsonString = jsonString.TrimEnd(',');
return jsonString + "}";
}
/// <summary>
/// 过滤特殊字符
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
private static string String2Json(String s)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.Length; i++)
{
char c = s.ToCharArray()[i];
switch (c)
{
case '/"':
sb.Append("///""); break;
case '//':
sb.Append("////"); break;
case '/':
sb.Append("///"); break;
case '/b':
sb.Append("//b"); break;
case '/f':
sb.Append("//f"); break;
case '/n':
sb.Append("//n"); break;
case '/r':
sb.Append("//r"); break;
case '/t':
sb.Append("//t"); break;
default:
sb.Append(c); break;
}
}
return sb.ToString();
}
/// <summary>
/// 格式化字符型、日期型、布尔型
/// </summary>
/// <param name="str"></param>
/// <param name="type"></param>
/// <returns></returns>
private static string StringFormat(string str, Type type)
{
if (type == typeof(string))
{
str = String2Json(str);
str = "/"" + str + "/"";
}
else if (type == typeof(DateTime))
{
str = "/"" + str + "/"";
}
else if (type == typeof(bool))
{
str = str.ToLower();
}
return str;
}
}

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