首先來看一下效果

頁面加載之初

節點全部展開后

首先數據庫的表結構如下

其中Id為主鍵,PId為關聯到自身的外鍵

兩個字段均為GUID形式

層級關系主要靠這兩個字段維護

其次需要有一個類型

public class MenuType{public Guid Id { get; set; }public Guid PId { get; set; }public string MenuName { get; set; }public string Url { get; set; }public int OrderNum { get; set; }public int SonCount { get; set; }}

此類型比數據庫表增加了一個屬性

SonCount

這個屬性用來記錄當前節點的子節點的個數

注意：也可以把此屬性放在數據庫中，性能上會提升一些，但需要增加額外的代碼來維護此字段

接下來看一下取數據的方式

protected void Page_Load(object sender, EventArgs e){if (Request["Action"] == "AJAX"){var result = GetMenu(Request["pid"]);JavaScriptSerializer serializer = new JavaScriptSerializer();string sRet = serializer.Serialize(result);Response.Write(sRet);Response.End();}}

頁面加載之初判斷是否需要獲取菜單數據

其中請求參數pid為客戶端需要獲取的節點ID

如果請求頂級節點，則此參數的值為00000000-0000-0000-0000-000000000000

GetMenu函數獲取需要請求的節點數據

private List<MenuType> GetMenu(string pid){var result = new List<MenuType>();SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=SHU;User ID=sa;Password=allen;");conn.Open();SqlCommand cmd = new SqlCommand();cmd.Connection = conn;cmd.CommandText = "select a.*,b.cout as count from Menu a left join (select COUNT(*) as cout,Menu.PId from Menu group by Menu.PId) as b on a.Id = b.PId where a.PId = '" + pid + "' order by OrderNum";SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);while (dr.Read()){var obj = new MenuType();obj.Id =Guid.Parse(dr["Id"].ToString());obj.MenuName = dr["MenuName"].ToString();obj.OrderNum = Convert.ToInt32(dr["OrderNum"]);obj.PId = dr["PId"] == DBNull.Value ? Guid.Empty : Guid.Parse(dr["PId"].ToString());obj.Url = dr["Url"].ToString();obj.SonCount = dr["count"] == DBNull.Value ? 0 : Convert.ToInt32(dr["count"]);result.Add(obj);}return result;}

在本DEMO中使用JavaScriptSerializer來序列化菜單數組

前臺的代碼如下

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent"><link href="Scripts/themes/default/style.css" rel="stylesheet" type="text/css" /><script src="Scripts/jquery.js" type="text/javascript"></script><script src="Scripts/jquery.jstree.js" type="text/javascript"></script><script>$(function () {$.getJSON("/default.aspx?ACTION=AJAX&pid=00000000-0000-0000-0000-000000000000", function (result) {$.each(result, function (i, item) {var typeN = item.SonCount > 0 ? "jstree-closed" : "jstree-leaf";$("#tree").append("<li id='phtml_" + item.Id + "' class='" + typeN + "'><a href='#'>" + item.MenuName + "</a></li>");});$("#demo2").jstree({"plugins": ["themes", "html_data", 'types', "ui", "checkbox"],'core': { 'animation': 0 },"types": { "types":{"person": { "icon": { "image": "/Scripts/themes/default/person.png"} },"depar2": { "icon": { "image": "/Scripts/themes/default/depar2.png"} },"default": { "icon": { "image": "/Scripts/themes/default/depar1.png"} }}}}).bind("open_node.jstree", function (e, data) {var id = data.rslt.obj[0].id;if ($("#" + id + " li").length > 0) { return; }$.getJSON("/default.aspx?ACTION=AJAX&pid=" + id.replace("phtml_", ""), function (result) {var str = "<ul>"$.each(result, function (i, item) {var typeN = item.SonCount > 0 ? "jstree-closed" : "jstree-leaf";var icon = item.SonCount > 0 ? "depar2" : "person";str += "<li rel = '" + icon + "' id='phtml_" + item.Id + "' class='" + typeN + "'><a href='#'> " + item.MenuName + "</a></li>";});str += "</ul>";$("#" + id).append(str);var tree = jQuery.jstree._reference("#" + id);tree.refresh();$("ins[class='jstree-checkbox jstree-icon']").removeClass("jstree-icon");$(".jstree-checkbox").attr("style", "");});});});});</script> </asp:Content> <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"><div id="demo2"><ul id="tree"></ul></div> </asp:Content>

　　

頁面加載之初，先請求頂級節點

如果頂級節點的SonCount屬性大于0

則使節點為閉合狀態（樣式為jstree-closed）

如果節點無子節點

則該節點的樣式為jstree-leaf

當用戶點擊閉合狀態的節點時，客戶端發起請求

并把點擊節點的ID傳給后端，后端獲取到點擊節點的子節點后

通過append添加到點擊節點下

至此，無限分級的樹創建完成

其中不包含數據庫

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