表单提交获取下载状态

思路：1 当submit后 1.1 后台接受请求，开始处理，处理完成后，准备下载文件，下载时给客户端写入cookie信息
1.2 当submit后，后台在处理，前台在调用setInterview,间隔的获取后台相应写入到站点的cookie值，如果该值被写
入后，在前台是客运获取到的，说明下载成功了 2 下载成功后清楚cookie和计时器

前段代码

 1 var VehicleNoPar = $("<input>");
 2         VehicleNoPar.attr("type", "hidden");
 3         VehicleNoPar.attr("name", "DownloadBookingIDs");
 4         VehicleNoPar.attr("value", DownloadBookingIdVal);
 5         form.append(VehicleNoPar);
 6 
 7         //将表单放置在web中 
 8         $("body").append(form);
 9 
10         var interval = setInterval(
11                 function () {
12                     var downloadSucess = getCookie("transReplayDownload");
13                     if (downloadSucess != undefined && downloadSucess != null && downloadSucess == "transReplayDownloadVal") {
14 
15                         clearInterval(interval);
16                         deleteCookie("transReplayDownload");
17 
18                         // 下载成功,刷新列表数据
19                         SearchData();
20                     }
21                     else {
22                         alert("下载中");
23                     }
24                 },
25                 1000,
26                 null
27             );
28 
29         //表单提交 
30         form.submit();

后台代码

 1 string userAgent = Request.ServerVariables["http_user_agent"].ToLower();
 2                 if (userAgent.IndexOf("firefox", System.StringComparison.Ordinal) == -1)
 3                 {
 4                     fileName = HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(fileName));
 5                 }
 6                 Response.AppendCookie(new HttpCookie("transReplayDownload", "transReplayDownloadVal"));
 7                 Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
 8                 Response.Charset = "GB2312";
 9                 Response.ContentEncoding = System.Text.Encoding.UTF8;
10                 Response.ContentType = "application/ms-excel";
11                 Response.WriteFile(filePath);
12                 Response.End();

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