ASP.NET MVC实现树形导航菜单

在需要处理很多分类以及导航的时候，树形导航菜单就比较适合。例如在汽车之家上：

页面主要分两部分，左边是导航菜单，右边显示对应的内容。现在，我们就在ASP.NET MVC 4 下临摹一个，如下：

实现的效果包括：
1、点击导航菜单上的品牌，左侧显示该品牌下的所有车型。
2、点击导航菜单上的车系，左侧显示该车系下的所有车型。
3、点击左侧上方的字母导航，锚点跳到导航菜单的对应部分。
4、页面加载完毕，显示所有品牌和车系，即树形导航完全展开。
5、点击导航菜单上的品牌，收缩或展开对应的车系，收缩时，品牌前面图标为+号，展开时，品牌前面的图片为-号。

源码部分，在这里。

思路呢？

页面分成左右2部分，使用Bootstrap轻松实现：

<div>
    <div>
    </div>
    <div>
    </div>
</div>

左侧最上方的字母导航，被放在一个div中，页面加载的时候向控制器动态请求。

品牌上方的字母归类，比如奥迪上方的字母A，实际上是一个div。

品牌和车系放在了ul中，比如奥迪品牌以及奥迪下的奥迪A4和奥迪A6车系。车系被放在了dl中。

树形菜单采用模版比较合适，先把数据填充到模版，再把模版追加到页面元素。

当点击左侧树形导航上的品牌或车系，右侧通过iframe来呈现对应的内容。

领域先行。有关品牌和车系就抽象成如下的类：

    public class CarCategory
    {
        public int Id { get; set; }
        public int ParentId { get; set; }
        public string Name { get; set; }
        public string FirstLetter { get; set; }
        public string AnchorName { get; set; }
        public int Level { get; set; }
        public short DelFlag { get; set; }
    }

有关车型就抽象成如下的类：

    public class Car
    {
        public int Id { get; set; }
        public int PinPaiId { get; set; }
        public int CheXiId { get; set; } 
        public string Name { get; set; }
    }

页面左侧呈现树形导航需要向控制器请求json数据，大致格式是：

首字母
锚点名称
所有品牌
品牌编号
品牌名称
所有车系
车系编号
车系名称
车系下车型的总数量

貌似有3层，那就从最里面这层开始建模。有关车系在树形导航中的显示：

    public class CheXiForDisplay
    {
        public int CheXiId { get; set; }
        public int TotalCount { get; set; }
        public string CheXiName { get; set; }
    }

有关品牌在树形导航中的显示：

    public class PinPaiForDisplay
    {
        public int PinPaiId { get; set; }
        public string PinPaiName { get; set; }
        public List<CheXiForDisplay> CheXis { get; set; }
    }

有关品牌车系分组的：

    public class PinPaiCheXiForDisplay
    {
        public string FirstLetter { get; set; }
        public string Anchor { get; set; }
        public List<PinPaiForDisplay> PinPais { get; set; }
    }

数据源从哪里来？模拟了一个：

    public class Database
    {
        public static IEnumerable<CarCategory> GetAllCarCategories()
        {
            return new List<CarCategory>
            {
                new CarCategory(){Id = 1, ParentId = 0, Name = "奥迪",FirstLetter = "A", AnchorName = "AA", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 2, ParentId = 0, Name = "宝马",FirstLetter = "B", AnchorName = "BB", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 3, ParentId = 0, Name = "保时捷",FirstLetter = "B", AnchorName = "BB", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 4, ParentId = 0, Name = "长安",FirstLetter = "C", AnchorName = "CC", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 5, ParentId = 0, Name = "大众",FirstLetter = "D", AnchorName = "DD", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 6, ParentId = 0, Name = "东风",FirstLetter = "D", AnchorName = "DD", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 7, ParentId = 0, Name = "丰田",FirstLetter = "F", AnchorName = "FF", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 8, ParentId = 0, Name = "福特",FirstLetter = "F", AnchorName = "FF", Level = 1, DelFlag = 0},
                new CarCategory(){Id = 9, ParentId = 1, Name = "奥迪A4",FirstLetter = "A", AnchorName = "AA", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 10, ParentId = 1, Name = "奥迪A6",FirstLetter = "A", AnchorName = "AA", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 11, ParentId = 2, Name = "宝马1",FirstLetter = "B", AnchorName = "BB", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 12, ParentId = 2, Name = "宝马2",FirstLetter = "B", AnchorName = "BB", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 13, ParentId = 3, Name = "保时捷1",FirstLetter = "B", AnchorName = "BB", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 14, ParentId = 3, Name = "保时捷2",FirstLetter = "B", AnchorName = "BB", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 15, ParentId = 4, Name = "长安1",FirstLetter = "C", AnchorName = "CC", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 16, ParentId = 4, Name = "长安2",FirstLetter = "C", AnchorName = "CC", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 17, ParentId = 5, Name = "大众1",FirstLetter = "D", AnchorName = "DD", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 18, ParentId = 5, Name = "大众2",FirstLetter = "D", AnchorName = "DD", Level = 2, DelFlag = 1},
                new CarCategory(){Id = 19, ParentId = 6, Name = "东风1",FirstLetter = "D", AnchorName = "DD", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 20, ParentId = 6, Name = "东风2",FirstLetter = "D", AnchorName = "DD", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 21, ParentId = 7, Name = "丰田1",FirstLetter = "F", AnchorName = "FF", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 22, ParentId = 7, Name = "丰田2",FirstLetter = "F", AnchorName = "FF", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 23, ParentId = 8, Name = "福特1",FirstLetter = "F", AnchorName = "AFF", Level = 2, DelFlag = 0},
                new CarCategory(){Id = 24, ParentId = 8, Name = "福特2",FirstLetter = "F", AnchorName = "AFF", Level = 2, DelFlag = 0}
            };
        }
        public static IEnumerable<Car> GetAllCars()
        {
            return new List<Car>
            {
                new Car(){Id = 1, PinPaiId = 1, CheXiId = 9, Name = "奥迪A401"},
                new Car(){Id = 2, PinPaiId = 1, CheXiId = 9, Name = "奥迪A402"},
                new Car(){Id = 3, PinPaiId = 1, CheXiId = 10, Name = "奥迪A601"},
                new Car(){Id = 4, PinPaiId = 1, CheXiId = 10, Name = "奥迪A602"},
                new Car(){Id = 5, PinPaiId = 2, CheXiId = 11, Name = "宝马101"},
                new Car(){Id = 6, PinPaiId = 2, CheXiId = 11, Name = "宝马102"},
                new Car(){Id = 7, PinPaiId = 2, CheXiId = 12, Name = "宝马201"},
                new Car(){Id = 8, PinPaiId = 2, CheXiId = 12, Name = "宝马202"},
                new Car(){Id = 9, PinPaiId = 3, CheXiId = 13, Name = "保时捷101"},
                new Car(){Id = 10, PinPaiId = 3, CheXiId = 13, Name = "保时捷102"},
                new Car(){Id = 11, PinPaiId = 3, CheXiId = 14, Name = "保时捷201"},
                new Car(){Id = 12, PinPaiId = 3, CheXiId = 14, Name = "保时捷202"},
                new Car(){Id = 13, PinPaiId = 4, CheXiId = 15, Name = "长安101"},
                new Car(){Id = 14, PinPaiId = 4, CheXiId = 15, Name = "长安102"},
                new Car(){Id = 15, PinPaiId = 4, CheXiId = 16, Name = "长安201"},
                new Car(){Id = 16, PinPaiId = 4, CheXiId = 16, Name = "长安202"},
                new Car(){Id = 17, PinPaiId = 5, CheXiId = 17, Name = "大众101"},
                new Car(){Id = 18, PinPaiId = 5, CheXiId = 17, Name = "大众102"},
                new Car(){Id = 19, PinPaiId = 5, CheXiId = 18, Name = "大众201"},
                new Car(){Id = 20, PinPaiId = 5, CheXiId = 18, Name = "大众202"},
                new Car(){Id = 21, PinPaiId = 6, CheXiId = 19, Name = "东风101"},
                new Car(){Id = 22, PinPaiId = 6, CheXiId = 19, Name = "东风102"},
                new Car(){Id = 23, PinPaiId = 6, CheXiId = 20, Name = "东风201"},
                new Car(){Id = 24, PinPaiId = 6, CheXiId = 20, Name = "东风202"},
                new Car(){Id = 25, PinPaiId = 7, CheXiId = 21, Name = "丰田101"},
                new Car(){Id = 26, PinPaiId = 7, CheXiId = 21, Name = "丰田102"},
                new Car(){Id = 27, PinPaiId = 7, CheXiId = 22, Name = "丰田201"},
                new Car(){Id = 28, PinPaiId = 7, CheXiId = 22, Name = "丰田202"},
                new Car(){Id = 29, PinPaiId = 8, CheXiId = 23, Name = "福特101"},
                new Car(){Id = 30, PinPaiId = 8, CheXiId = 23, Name = "福特102"},
                new Car(){Id = 31, PinPaiId = 8, CheXiId = 24, Name = "福特201"},
                new Car(){Id = 32, PinPaiId = 8, CheXiId = 24, Name = "福特202"}
            };
        }
    }

好，现在可以向控制器要数据了。

   public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }
        //获取所有首字母以及锚点的json
        public ActionResult GetFirstLettersJson()
        {
            var allCarCategories = Database.GetAllCarCategories();
            var result = from l in allCarCategories
                group l by l.FirstLetter
                into g
                select new {firstletter = g.Key, anchor=g.ToList()[0].AnchorName};
            return Json(result, JsonRequestBehavior.AllowGet);
        }
        //获取按首字母分组后的品牌车系json
        public ActionResult GetPinPaiCheXiJson() 
        {
            var allPinPais = Database.GetAllCarCategories().Where(c => c.Level == 1).OrderBy(c => c.FirstLetter);
            var allPinPaisGroup = from p in allPinPais
                group p by new
                {
                    p.FirstLetter,
                    p.AnchorName
                };
            List<PinPaiCheXiForDisplay> result1 = new List<PinPaiCheXiForDisplay>();
            foreach (var item in allPinPaisGroup)
            {
                //品牌车系
                PinPaiCheXiForDisplay pinPaiCheXiForDisplay = new PinPaiCheXiForDisplay();
                pinPaiCheXiForDisplay.FirstLetter = item.Key.FirstLetter;
                pinPaiCheXiForDisplay.Anchor = item.Key.AnchorName;
                
                //品牌
                List<PinPaiForDisplay> pinPaiForDisplays = new List<PinPaiForDisplay>();
                foreach (var pinpai in item.ToList())
                {
                    PinPaiForDisplay pinPaiForDisplay = new PinPaiForDisplay();
                    pinPaiForDisplay.PinPaiId = pinpai.Id;
                    pinPaiForDisplay.PinPaiName = pinpai.Name;
                    
                    //车系
                    List<CheXiForDisplay> cheXiForDisplays = new List<CheXiForDisplay>();
                    var cheXis = Database.GetAllCarCategories().Where(c => c.ParentId == pinpai.Id).OrderBy(c => c.Id);
                    foreach (var chexi in cheXis)
                    {
                        CheXiForDisplay cheXiForDisplay = new CheXiForDisplay();
                        cheXiForDisplay.CheXiId = chexi.Id;
                        cheXiForDisplay.CheXiName = chexi.Name;
                        cheXiForDisplay.TotalCount = cheXis.Count();
                        cheXiForDisplays.Add(cheXiForDisplay);
                    }
                    pinPaiForDisplay.CheXis = cheXiForDisplays;
                    pinPaiForDisplays.Add(pinPaiForDisplay);
                }
                pinPaiCheXiForDisplay.PinPais = pinPaiForDisplays;
                result1.Add(pinPaiCheXiForDisplay);
            }
            return Json(result1, JsonRequestBehavior.AllowGet);
        }
        //根据品牌Id显示车型
        public ActionResult GetCheXingsByPId(int pid)
        {
            var cars = Database.GetAllCars().Where(c => c.PinPaiId == pid);
            return View(cars);
        }
        //根据车系Id显示车型
        public ActionResult GetCheXingsByChexiId(int cxid)
        {
            var cars = Database.GetAllCars().Where(c => c.CheXiId == cxid);
            return View(cars);
        }
    }

在Shared/_Layout.cshtml中，该引用的css,js都要引用上。

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width" />
    <title>@ViewBag.Title</title>
    <link href="~/bootstrap/css/bootstrap.min.css" rel="external nofollow"  rel="stylesheet" />
    @Styles.Render("~/Content/css")
    @RenderSection("styles", required: false)
    @Scripts.Render("~/bundles/jquery")
    <script src="~/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
    @RenderBody()
    
    @RenderSection("scripts", required: false)
</body>

Home/Index.cshtml就负责显示就行了。

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@section styles
{
    <link href="~/Content/sidemenu.css" rel="external nofollow"  rel="stylesheet" />
}
<div>
    <div>
        <!--字母导航开始-->
        <div id="lDaoHang">
        </div>
        <!--字母导航结束-->
        <!--树开始-->
        <div id="cTreeDiv">
        </div>
        <!--树结束-->
        <div>
            <dl id="test"></dl>
        </div>
    </div>
    <div>
        <div id="carContent">
            <iframe id="frameCar" src="" scrolling="no" frameborder="0" height="100%" width="100%" onload="this.height=this.contentWindow.document.documentElement.scrollHeight"></iframe>
        </div>
    </div>
</div>
@section scripts
{
    <script src="~/Scripts/jquery.tmpl.min.js"></script>
    <script type="text/javascript">
        $(function () {
            //加载首字母
            $.getJSON("@Url.Action("GetFirstLettersJson", "Home")", function (data) {
                $("#firstLetterTemplate").tmpl(data).appendTo("#lDaoHang");
            });
            //加载所有品牌车系
            $.getJSON("@Url.Action("GetPinPaiCheXiJson", "Home")", function (data) {
                $("#pinpaiTemplate").tmpl(data).appendTo("#cTreeDiv");
                $(".pLink").each(function () {
                    pinPaiInitialState($(this));
                });
            });
            //隐藏ifame所在div
            $("#carContent").css("display", "none");
            //点击品牌
            $("#cTreeDiv").on("click", ".pLink", function () {
                //切换
                togglePinPaiState($(this));
                //显示右边区域
                var url = "/Home/GetCheXingsByPId?pid=" + $(this).attr("id");
                $("#frameCar").attr("src", url);
                $("#carContent").css("display", "block");
            });
            //点击车系
            $("#cTreeDiv").on("click", ".cxLink", function () {
                //显示右边区域
                var url = "/Home/GetCheXingsByChexiId?cxid=" + $(this).attr("id");
                $("#frameCar").attr("src", url);
                $("#carContent").css("display", "block");
            });
        });
        //品牌的初始状态,即把车系隐藏和品牌前面的图标为+号
        var pstate = 0;
        //品牌只有2种状态：所有车系隐藏，品牌前面的图标变为为+号；要么显示品牌下的所有车系，品牌前面的图标变为-号
        //把车系隐藏和品牌前面的图标为+号，记为状态0
        //把车系隐藏和品牌前面的图标为-号，记为状态1
        function togglePinPaiState($pinpai) {
            if (pstate == 0) {
                var $i = $pinpai.parent().find("i");
                var attr = $i.attr("class");
                if (typeof attr !== typeof undefined && attr !== false) {
                    $i.removeClass("iconHide");
                }
                $i.addClass("iconShow");
                $pinpai.parent().parent().find("dl").show();
                pstate = 1;
            } else {
                var $j = $pinpai.parent().find("i");
                var attr1 = $j.attr("class");
                if (typeof attr1 !== typeof undefined && attr1 !== false) {
                    $j.removeClass("iconShow");
                }
                $j.addClass("iconHide");
                $pinpai.parent().parent().find("dl").hide();
                pstate = 0;
            }
        }
        function pinPaiInitialState($pinpai) {
            pstate = 0;
            togglePinPaiState($pinpai);
        }
    </script>
    <!--首字母模版-->
    <script id="firstLetterTemplate" type="text/x-jQuery-tmpl">
        <div>
            <a href="#${anchor}" rel="external nofollow" >${firstletter}</a>
        </div>
    </script>
    <!--品牌模版-->
    <script id="pinpaiTemplate" type="text/x-jQuery-tmpl">
        <div id="${Anchor}">${FirstLetter}</div>
        <ul>
            {{if PinPais}}
            {{each PinPais}}
            <li>
                <h5>
                    <a href="javascript:void(0)" rel="external nofollow"  rel="external nofollow"  id="${$value.PinPaiId}"><i></i>${$value.PinPaiName}</a>
                </h5>
                <dl>
                    {{tmpl(CheXis) "#chexiTemplate"}}
                </dl>
            </li>
            {{/each}}
            {{else}}
            <li>没有对应品牌</li>
            {{/if}}
                
        </ul>
    </script>
    <!--车系模版-->
    <script id="chexiTemplate" type="text/x-jQuery-tmpl">
        <dd><a id="${CheXiId}" href="javascript:void(0)" rel="external nofollow"  rel="external nofollow" >${CheXiName}<em>(${TotalCount})</em></a></dd>
    </script>
}

以上，

• 从控制器返回的有关树形菜单的json数据，先填充到jquery.tmpl.min.js模版中，然后追加到页面上。
• 树形菜单的展开或收缩，通过全局变量pstate在0和1之间的切换来实现，页面初次加载给变量pstate一个初始值。

另外，点击树形导航上的品牌，iframe加载的视图是Home/GetCheXingsByPId.cshtml

@model IEnumerable<MvcApplication1.Models.Car>
@{
    ViewBag.Title = "GetCheXingsByPId";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>GetCheXingsByPId</h2>
<div>
    @foreach (var item in Model)
    {
        <p>@item.Name </p>
    
    }
</div>

点击树形导航上的车系，iframe加载的视图是Home/GetCheXingsByChexiId.cshtml

@model IEnumerable<MvcApplication1.Models.Car>
@{
    ViewBag.Title = "GetCheXingsByChexiId";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>GetCheXingsByChexiId</h2>
<div>
    @foreach (var item in Model)
    {
        <p>@item.Name </p>
    
    }
</div>

就这样。

到此这篇关于ASP.NET MVC实现树形导航菜单的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持。