ASP.NET MVC实现城市或车型三级联动

三级或多级联动的场景经常会碰到，比如省、市、区，比如品牌、车系、车型，比如类别的多级联动......我们首先想到的是用三个select来展示，这是最通常的做法。但在另外一些场景中，比如确定搜索条件的时候，对于三级联动来说，可能选择1个，2个，或3个条件，我想，以下的方式可能更适合：

以上，可以只选择品牌，或同时选择品牌、车系，或同时选择品牌、车系、车型，最后把选择的内容展示到input上，并以逗号隔开。

可以实现的功能包括：

• 点击最上面的input弹出div，此时只显示品牌区域
• 点击最左边拼音首字母，导航到对应的品牌上
• 当把鼠标移动到某个品牌上，品牌为选中状态，其对应的车系显示在车系区域
• 当鼠标不在任何品牌上，所有品牌都为不选中状态
• 当把鼠标移动到某个车系上，车系为选中状态，其对应的车型显示在车型区域，选中车系的所属品牌也为选中状态
• 当鼠标不在任何车系上，所有车系、品牌都为不选中状态
• 当把鼠标移动到某个车型上，车型为选中状态，选中车型的所属车系为选中状态，选中车系所属品牌为选中状态
• 当鼠标不在任何车型上，所有车型、车系、品牌为不选中状态
• 点击品牌，品牌显示到input上
• 点击车系，品牌、车系显示到input上，并以逗号隔开
• 点击车型，品牌、车系、车型显示到input上，并以逗号隔开
• 点击div上的关闭按钮或者页面空白区域，div隐藏

界面的构成如下：

• 最上面的是一个input
• 品牌、车系、车型被包裹在一个div中，点击关闭按钮或点击空白处关闭的就是这个div
• 品牌区域是一个div，分为首字母导航div和品牌显示div
• 车系区域是一个div
• 车型区域是一个div
• 品牌、车系、车型内的内容是一些dl, dt, dd的html元素
• 样式的事情交给css

实现的思路大致这样：

• 给input点击事件，点击弹出品牌、车系、车型显示的div，并绑定页面空白区域的点击事件
• 导航首字母指向锚点，品牌按首字母分类并提供锚点id
• 在控制器中把品牌按照首字母分类，以json格式返回到前端，填充到tmpl模版，再追加到页面品牌区域
• 给品牌添加鼠标移上事件，品牌为选中状态，对应的车系显示在车系区域
• 给品牌添加鼠标移去事件
• 给品牌添加点击事件，把点击品牌显示到input上
• 给车系添加鼠标移上事件，当前车系为选中状态，其对应的车型显示在车型区域，其所属的品牌为选中状态
• 给车系添加鼠标移去事件
• 给车系添加点击事件，把点击车系和所属品牌显示到input上，以逗号隔开
• 给车型添加鼠标移上事件，当前车型为选择状态，其所属父类车系为选中状态，车型所属父类品牌也为选中状态
• 给车型添加点击事件，把点击车型和所属车系、品牌显示到input上，以逗号隔开
• 给关闭按钮添加点击事件，关闭div，并解除页面空白区域点击事件的绑定

领域先行，首先是有关品牌、车系、车型的模型：

    public class CarCategory
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public int PId { get; set; }
        public string FirstLetter { get; set; }
        public string AnchorName { get; set; }
        public int Level { get; set; }
    }

• PId属性用来表示父类Id,车系的父类Id为某个品牌Id,车型的父类Id为某个车系Id
• FirstLetter属性用来表示首字母，作为分组的条件
• AnchorName属性用来表示品牌的锚点id，车系和车型此项为空

在ASP.NET MVC4中，在Shared/Layout.cshtml中，该有的css,js都必须有：

    
    
    
    @Styles.Render("~/Content/css")
    @RenderSection("styles", required: false)
    
    @Scripts.Render("~/bundles/jquery")
    


    @RenderBody()
    
    @RenderSection("scripts", required: false)

模拟一个数据库，该数据库类可以获取到所有的品牌、车系、车型，以及根据品牌Id或车系Id获取对应的车系和车型。

   public class Database
    {
        public static IEnumerable GetCarCategories()
        {
            return new List()
            {
                 new CarCategory(){Id = 0, Name = "奥迪",FirstLetter = "A",AnchorName = "aa", Level = 1, PId = -1},
                 new CarCategory(){Id = 1, Name = "奥斯顿·马丁",FirstLetter = "A",AnchorName = "aa", Level = 1, PId = -1},
                 new CarCategory(){Id = 2, Name = "宝骏",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 3, Name = "巴博斯",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 4, Name = "北汽威旺",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 5, Name = "北汽制造",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 6, Name = "奔驰",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 7, Name = "别克",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 8, Name = "宾利",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 9, Name = "保时捷",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 10, Name = "比亚迪",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 11, Name = "奔腾",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 12, Name = "标致",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 13, Name = "本田",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 14, Name = "宝马",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 15, Name = "北京汽车",FirstLetter = "B",AnchorName = "bb", Level = 1, PId = -1},
                 new CarCategory(){Id = 16, Name = "昌河",FirstLetter = "C",AnchorName = "cc", Level = 1, PId = -1},
                 new CarCategory(){Id = 17, Name = "长安",FirstLetter = "C",AnchorName = "cc", Level = 1, PId = -1},
                 new CarCategory(){Id = 18, Name = "长城",FirstLetter = "C",AnchorName = "cc", Level = 1, PId = -1},
                 new CarCategory(){Id = 19, Name = "奥迪A4",FirstLetter = "A",AnchorName = "", Level = 2, PId = 0},
                 new CarCategory(){Id = 20, Name = "奥迪A6L",FirstLetter = "A",AnchorName = "", Level = 2, PId = 0},
                 new CarCategory(){Id = 21, Name = "奥迪Q3",FirstLetter = "A",AnchorName = "", Level = 2, PId = 0},
                 new CarCategory(){Id = 22, Name = "奥迪A4舒适版",FirstLetter = "A",AnchorName = "", Level = 3, PId = 19},
                 new CarCategory(){Id = 23, Name = "奥迪A4尊贵版",FirstLetter = "A",AnchorName = "", Level = 3, PId = 19},
                 new CarCategory(){Id = 24, Name = "奥迪A6L舒适版",FirstLetter = "A",AnchorName = "", Level = 3, PId = 20},
                 new CarCategory(){Id = 25, Name = "奥迪A6L黄金版",FirstLetter = "A",AnchorName = "", Level = 3, PId = 20},
                 new CarCategory(){Id = 26, Name = "奥迪Q3舒适版",FirstLetter = "A",AnchorName = "", Level = 3, PId = 21},
                 new CarCategory(){Id = 27, Name = "奥迪Q3至尊版",FirstLetter = "A",AnchorName = "", Level = 3, PId = 21},
            };
        }
        //根据品牌或车系I获取所有车系或车型
        public static IEnumerable GetCarCategoriesByPId(int pid)
        {
            return GetCarCategories().Where(c => c.PId == pid);
        }
    }   

在HomeController中，在前端页面加载的时候，这里提供一个分组好的所有品牌的json格式给前端；当前端把鼠标移动到某个品牌上，这里根据品牌Id返回车系的json格式给前端；当前端把鼠标移动到某个车系上，这里根据车系Id返回车型的json格式给前端。

   public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }
        //获取所有品牌
        public ActionResult GetPinPai()
        {
            var allPinPai = Database.GetCarCategories().Where(c => c.Level == 1).OrderBy(c => c.Id);
            var result = from p in allPinPai
                group p by new
                {
                    p.FirstLetter,
                    p.AnchorName
                }
                into g
                select new {firstletter = g.Key.FirstLetter, anchor = g.Key.AnchorName, pinpais = g};
            return Json(result, JsonRequestBehavior.AllowGet);
        }
        //根据品牌Id获取车系
        [HttpPost]
        public ActionResult GetCheXiByPId(int pid) 
        {
            var allCheXi = Database.GetCarCategoriesByPId(pid).OrderBy(c => c.Id);
            var result = from c in allCheXi
                select new {chexi = c.Name, cxid = c.Id, parentId = c.PId};
            return Json(result);
        }
        //根据车系Id获取车型
        [HttpPost]
        public ActionResult GetCheXingByCxId(int cxid) 
        {
            var allCheXing = Database.GetCarCategoriesByPId(cxid).OrderBy(c => c.Id);
            var result = from c in allCheXing
                         select new { chexing = c.Name, chexingid = c.Id, parentId = c.PId };
            return Json(result);
        }
    }   

在Home/Index.cshtml视图中，品牌、车系、车型内容都是先填充到tmpl模版中，然后追加到页面某个区域上的。

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@section styles
{
    
}

   
   
        ∨
   


    
    

        

            
请选择品牌
            

                A
                B
                C
                D
                F
                G
                H
                J
                K
                L
                M
                N
                O
                Q
                R
                S
                W
                X
                Y
                Z
            
            

            
        
        

            
请选择车系
            

           
            
        
        

            
请选择车型
            

               
            
        
    

@section scripts
{
    
    
    
    
    
    
    
    
}

css部分如下，关闭按钮可自找。

#carcategory-picker-outer {
    background: #f9f9f9;
    padding: 10px;
    width: 640px;
    height: 380px;
    position: relative;
    display: none;
}

#PreLetter {
    border: 0px solid blue;
    width: 21px;
    float: left;
}

#PreLetter a:link{
    display: block;
    text-decoration: none;
    clear: both;
    font-size: 10px;
    text-align: center;
    padding-top: 0px;
    border: 1px solid #e3e3e3;
    width: 15px;
    height: 15px;
    background-color: #e9e9e9;
    margin-top: 2px;
    font-weight: bold;
}

#PreLetter a:hover {
    border: 1px solid blue;
}

#PreLetter a:visited {
    border: 1px solid #e3e3e3;
}

#pinpai {
    border: 0px solid green;
    float: left;
}

#AllPinPai {
    border: 1px solid #e3e3e3;
    margin-left: 5px;
    float: left;
    padding-bottom: 0px;
    width: 120px;
    height: 340px;
    overflow-y: auto;
}

#AllPinPai dl dd a {
    text-decoration: none;
    display: block;
    padding-left: 10px;
}

#AllPinPai dl dd {
    padding-left: 0px;
}

#AllPinPai dl dd a:hover {
    /*background-color: gray;*/
    color: white;
}

#AllPinPai dl {
    margin-bottom: 5px;
}

#chexi {
    border: 0px solid orange;
    float: left;
    margin-left: 10px;
    display: none;
}

#AllCheXi {
    width: 150px;
    height: 340px;
    overflow-y: auto;
    border: 1px solid #e3e3e3;
}

#AllCheXi dl dd a {
    text-decoration: none;
    display: block;
    padding-left: 10px;
}

#AllCheXi dl dd {
    padding-left: 0px;
}

#AllCheXi dl dd a:hover {
    color: white;
}

#AllCheXi dl {
    margin-bottom: 5px;
}

#chexin {
    border: 0px solid red;
    float: left;
    margin-left: 10px;
    display: none;
}

#AllCheXing {
    width: 300px;
    height: 340px;
    overflow-y: auto;
    border: 1px solid #e3e3e3;
    
}

#AllCheXing dl dd a {
    text-decoration: none;
    display: block;
    padding-left: 10px;
}

#AllCheXing dl dd {
    padding-left: 0px;
}

#AllCheXing dl dd a:hover {
    background-color: gray;
    color: white;
}

#AllCheXing dl {
    margin-bottom: 5px;
}


dt {
    background-color: #e9e9e9;
    padding-left: 10px;
}

dl {
    border: 0px solid red;
}

dd {
    padding-left: 10px;
    line-height: 15px;
    margin-top: 5px;
    margin-bottom: 0px;
    border: 0px solid blue;
    /*background-color: gray;*/
}

.selected {
    background-color: gray;
    color: white;
}

.cancel {
    width: 20px;
    height: 17px;
    position: absolute;
    display: block;
    top: 20px;
    right: 20px;
    background-image: url("../img/close.png");
    border: 1px solid orangered;
    background-color: orangered;
}

.input-group {
    width: 640px;
}

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对脚本之家的支持。如果你想了解更多相关内容请查看下面相关链接