我查看了很多网站，大部分评论分页都是局部刷新的，可大部分电商商品展示分页都是有刷新页面的，于是我便做了一个商品展示无刷新分页的例子。接下来我就将做一个模仿淘宝已买到的宝贝功能，不过我的是无刷新分页的。
至于为何要用无刷新分页（局部刷新）呢，我个人觉得有几点原因：
-
提高用户体验，无刷新分页网页看起来相对静止，滚轮不会跳到上面，加载速度比较快；
-
减轻网站服务器压力，返回局部页面（其中无需包含样式和脚本）肯定比返回整个页面要来的轻松；
-
还有个分页的好处就是减轻数据库的压力，返回几行的数据肯定比返回所有行的数据要轻松啦。
首先右击项目-管理NuGet程序包，联机搜索MvcPager,并安装
然后在BLL的订单管理OrderManage类里添加一个ToPagedList方法，第几页pageIndex和每页行数pageSize是必需的，其他都可空。
1 public PagedList<SH_Order> ToPagedList(int pageIndex, int pageSize, string orderBy, string orderName, SH_OrderState? state, SH_PayType? payType, DateTime? startTime, DateTime? endTime, long? accountId)
2 {
3 using (var db = new ShopContext())
4 {
5 var log = db.Order.Include(s => s.Account);
6
7 if (accountId != null)
8 {
9 log = db.Order.Where(o => o.AccountId == accountId);
10 }
11
12 if (state != null)
13 {
14 log = log.Where(o => o.State == state);
15 }
16
17 if (payType != null)
18 {
19 log = log.Where(o => o.PayType == payType);
20 }
21
22 if (startTime != null)
23 {
24 log = log.Where(o => o.LogTime > startTime);
25 }
26
27 if (endTime != null)
28 {
29 log = log.Where(o => o.LogTime < endTime);
30 }
31
32 if (!string.IsNullOrWhiteSpace(orderName))
33 {
34 log = log.Where(o => o.OrderName.Contains(orderName));
35 }
36
37 switch (orderBy)
38 {
39 case "LogTime":
40 log = log.OrderBy(o => o.LogTime);
41 break;
42 case "LogTime Desc":
43 log = log.OrderByDescending(o => o.LogTime);
44 break;
45 case "AccountName":
46 log = log.OrderBy(o => o.Account.AccountName);
47 break;
48 case "AccountName Desc":
49 log = log.OrderByDescending(o => o.Account.AccountName);
50 break;
51 case "TotalPrice":
52 log = log.OrderBy(o => o.TotalPrice);
53 break;
54 case "TotalPrice Desc":
55 log = log.OrderByDescending(o => o.TotalPrice);
56 break;
57 case "OrderName":
58 log = log.OrderBy(o => o.OrderName);
59 break;
60 case "OrderName Desc":
61 log = log.OrderByDescending(o => o.OrderName);
62 break;
63 case "PayTime":
64 log = log.OrderBy(o => o.PayTime);
65 break;
66 case "PayTime Desc":
67 log = log.OrderByDescending(o => o.PayTime);
68 break;
69 default:
70 log = log.OrderByDescending(o => o.ID);
71 break;
72 }
73
74 return log.ToPagedList(pageIndex, pageSize);
75 }
76 }
可是只有订单还不行呀，订单是有订单明细的，也就是说除了订单表还有订单明细表，这个不搞出来岂不是做不了淘宝的那个功能？那就再加一个方法：
1 public List<List<SH_OrderDetail>> GetOrderDetailByOrders(PagedList<SH_Order> orders)
2 {
3 using (var db = new ShopContext())
4 {
5 var details = new List<List<SH_OrderDetail>>();
6 orders.ForEach(o => details.Add(db.OrderDetail.Include(j => j.Gift).Where(j => j.OrderId == o.ID).ToList()));
7 return details;
8 }
9 }
至此，订单和订单明细都能获取，BLL的逻辑处理已经完成了。接下来就是Web项目的事了。先建一个订单模型：
1 public class OrdersViewModel
2 {
3 public PagedList<SH_Order> Orders { get; set; }
4
5 public List<List<SH_OrderDetail>> OrderDetails { get; set; }
6 }
这个模型用来存放从BLL获取的订单和订单明细，然后就处理Controller了：
[ShopAuthorize]
public ActionResult OrderList(string orderState, string orderBy, string payType, string logTime, string orderName, string giftName, int pageSize = 10, int pageIndex = 1)
{
DateTime? startTime = null;
DateTime? endTime = null;
switch (logTime)
{
case "1MonthAgo":
endTime = DateTime.Now.AddMonths(-1);
break;
default:
startTime = DateTime.Now.AddMonths(-1);
break;
}
SH_OrderState enumOrderState;
var result = Enum.TryParse(orderState, out enumOrderState);
SH_OrderState? endOrderState = null;
if (result) endOrderState = enumOrderState;
SH_PayType enumPayType;
result = Enum.TryParse(payType, out enumPayType);
SH_PayType? endPayType = null;
if (result) endPayType = enumPayType;
var manage = new OrderManage();
var orders = manage.ToPagedList(pageIndex, pageSize, orderBy, orderName, endOrderState, endPayType, startTime, endTime, long.Parse(User.Identity.GetUserId()));
var orderList = new OrdersViewModel
{
Orders = orders,
OrderDetails = manage.GetOrderDetailByOrders(orders)
};
if (Request.IsAjaxRequest())
{
return PartialView("_OrderList", orderList);
}
ViewBag.OrderState = Common.Common.GetSelectListByEnum(typeof(SH_OrderState), "全部订单状态");
ViewBag.PayType = Common.Common.GetSelectListByEnum(typeof(SH_PayType), "全部支付方式");
ViewData["GiftLevel"] = Common.Common.GetSelectListByEnum(typeof(SH_GiftLevel));
return View("OrderManage", orderList);
}
其中ShopAuthorize是我自定义的登录验证：
1 public class ShopAuthorizeAttribute : AuthorizeAttribute
2 {
3 protected override bool AuthorizeCore(HttpContextBase httpContext)
4 {
5 var user = httpContext.User;
6 return user != null && user.IsInRole("Account");
7 }
8
9 protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
10 {
11 if (filterContext == null)
12 {
13 return;
14 }
15
16 var path = filterContext.HttpContext.Request.Path;
17 const string strUrl = "/Account/Login?returnUrl={0}";
18 filterContext.HttpContext.Response.Redirect(string.Format(strUrl, HttpUtility.UrlEncode(path)), true);
19 }
20 }
Controller也完成了数据的传递，最后只剩下页面了，先说OrderManage页面，此页面关键地方在于异步提交的表单：
提醒一下，要用Ajax提交需加上jquery.unobtrusive-ajax.min.js引用，另外还需加上
其中每页行数选择的就自己在OrderManage写一个下拉列表，再写个脚本实现改变行数时改变表单里的id为pageSize的值，并触发表单的提交即可，排序的也同理改变表单里的id为orderBy的值并触发表单的提交即可。最后就只剩下局部页面_OrderList了，这里的关键点在于：
至此，无刷新分页功能已完成，来张效果图吧
是不是和淘宝的有点像捏
。
声明，本文有参考http://www.webdiyer.com/mvcpager/，样式也可以在http://www.webdiyer.com/mvcpager/demo/applycss/学习一下。欢迎探讨共同学习喔。
JIW.gif)
时间： 2024-10-09 15:52:37