ASP.NET MVC项目实现三级联动无刷新_实用技巧_

 using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; namespace MvcApplication2.Models { public class Customer { public int CustomerID { get; set; } public string Name { get; set; } } public class Order { public int OrderID { get; set; } public int CustomerID { get; set; } public DateTime OrderTime { get; set; } } public class OrderDetail { public int OrderDetailID { get; set; } public int OrderID { get; set; } public List Products { get; set; } } public class Product { public int ProductID { get; set; } [Display(Name = "产品名称")] public string Name { get; set; } [Display(Name = "单价")] public decimal UnitPrice { get; set; } } }

 //获取客户信息 public static List GetCustomers() { List customers = new List(); customers.Add(new Customer(){CustomerID = 1,Name = "张三"}); customers.Add(new Customer(){CustomerID = 2, Name = "李四"}); return customers; }

 public ActionResult Index() { List customers = Service.GetCustomers(); List items = new List(); foreach (Customer customer in customers) { SelectListItem item = new SelectListItem() { Text = customer.Name, Value = customer.CustomerID.ToString() }; items.Add(item); } ViewData["c"] = items; return View(); }

客户：@Html.DropDownList("Customers", (List)ViewData["c"],"==选择客户==",new {id = "Customers"} )

 //根据客户获取订单 public static List GetOrdersByCustomer(int customerID) { List orders = new List(); orders.Add(new Order(){OrderID = 1,CustomerID = 1,OrderTime = new DateTime(2014,1,2)}); orders.Add(new Order() { OrderID = 2, CustomerID = 1, OrderTime = new DateTime(2014, 1, 3) }); orders.Add(new Order() { OrderID = 3, CustomerID = 2, OrderTime = new DateTime(2014,1,4) }); orders.Add(new Order() { OrderID = 4, CustomerID = 2, OrderTime = new DateTime(2014,1,5) }); return orders.Where(o => o.CustomerID == customerID).ToList(); }

 //根据客户获取订单 [HttpPost] public JsonResult Orders(string customerID) { List> items = new List>(); if (!string.IsNullOrEmpty(customerID)) { var orders = Service.GetOrdersByCustomer(int.Parse(customerID)); if (orders.Count() > 0) { foreach (Order order in orders) { items.Add(new KeyValuePair( order.OrderID.ToString(), string.Format("{0} ({1:yyyy-MM-dd})",order.OrderID,order.OrderTime))); } } } return Json(items); }

 客户：@Html.DropDownList("Customers", (List)ViewData["c"],"==选择客户==",new {id = "Customers"} ) 
 订单：==选择订单==

 @section scripts {  }

 //根据订单获取产品，订单和产品之间有中间表订单明细 public static List GetProductsByOrder(int orderID) { List products = new List(); products.Add(new Product(){ProductID = 1, Name = "产品1", UnitPrice = 85m}); products.Add(new Product() { ProductID = 2, Name = "产品2", UnitPrice = 95m }); products.Add(new Product() { ProductID = 3, Name = "产品3", UnitPrice = 65m }); products.Add(new Product() { ProductID = 4, Name = "产品4", UnitPrice = 75m }); List orderDetails = new List(); orderDetails.Add(new OrderDetail(){OrderDetailID = 1, OrderID = 1, Products = new List() { products[0], products[1] }}); orderDetails.Add(new OrderDetail() { OrderDetailID = 2, OrderID = 2, Products = new List() { products[2], products[3] } }); orderDetails.Add(new OrderDetail() { OrderDetailID = 3, OrderID = 3, Products = new List() { products[1], products[3] } }); orderDetails.Add(new OrderDetail() { OrderDetailID = 4, OrderID = 4, Products = new List() { products[0], products[2] } }); OrderDetail orderDetailsTemp = orderDetails.Where(od => od.OrderID == orderID).FirstOrDefault(); return orderDetailsTemp.Products; }

 //根据订单获取产品 [HttpPost] public JsonResult Products(string orderID) { List> items = new List>(); int id = 0; //需要传入服务层方法的id if (!string.IsNullOrEmpty(orderID) && int.TryParse(orderID, out id)) { var products = Service.GetProductsByOrder(id); if (products.Count() > 0) { foreach (Product product in products) { items.Add(new KeyValuePair( product.ProductID.ToString(), product.Name )); } } } return Json(items); }

 客户：@Html.DropDownList("Customers", (List)ViewData["c"],"==选择客户==",new {id = "Customers"} ) 
 订单：==选择订单==
 产品：==选择产品==

 @section scripts {  }

 //根据产品ID获得产品信息 public static Product GetProduct(int productId) { List products = new List(); products.Add(new Product() { ProductID = 1, Name = "产品1", UnitPrice = 85m }); products.Add(new Product() { ProductID = 2, Name = "产品2", UnitPrice = 95m }); products.Add(new Product() { ProductID = 3, Name = "产品3", UnitPrice = 65m }); products.Add(new Product() { ProductID = 4, Name = "产品4", UnitPrice = 75m }); return products.Where(p => p.ProductID == productId).FirstOrDefault(); }

 //根据产品ID获得产品 public ActionResult ProductInfo(string productID) { int id = 0; if (!string.IsNullOrEmpty(productID) && int.TryParse(productID, out id)) { var product = Ser
                
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