文件下载完成后，我们可以知道任何事件/方式吗？ [英] Is there any event/way we can know when a file has finished downloading?

问题描述

这个问题已被问了很长时间，但我无法得到完美的答案。所以我再试一次。

假设您希望在文件从服务器上完全下载后显示一条消息。是的，有可能上传文件的方法，甚至在下载时显示进度条，但有没有特定的实例/信息/事件可以告诉下载何时完成？

我所知道的可能是它可以在cookie的帮助下实现。但是如何？

解决方案

当您从服务器请求文件时，请从客户端向下载服务发送唯一密钥。 / p>

获取/下载？fileId = someId& cookieName = abc

服务器时已完成提供文件内容，设置一个具有唯一名称的cookie

  var cookieName = Request.QueryString [cookieName]; 
 Response.Cookies.Add（new HttpCookie（cookieName，true）
 {
 Path =/，
 HttpOnly = false 
}）; 
  

同时，在你的JavaScript中，听一个带有你唯一名字的cookie，一旦设置好，做一个回调：

  window.setInterval（function（）{
 var cookie = $ .cookie（'abc '）; 
 if（cookie！== null）{
 callback（）; 
} 
}，500）; 
  

您可能还想在完成后删除cookie。

This question has been asked a much time, but I am unable to get a perfect answer to implement. So I give it a try asking one more time.

Suppose you wish to show a message when your file has be completely downloaded from the server. Yes, there are possible ways for uploading a file, and even showing a progress bar on download, but is there any particular instance/information/event which should tell when the download has been completed?

All I yet know is that might be it can be implemented with the help of cookies may be. But how?

解决方案

When you request a file from your server, send a unique key to the download service from the client.

GET /Download?fileId=someId&cookieName=abc

When the server has finished serving the file contents, set a cookie with the unique name

var cookieName = Request.QueryString["cookieName"]; 
Response.Cookies.Add(new HttpCookie(cookieName , "true")
{
    Path = "/",
    HttpOnly = false
});

Meanwhile, in your JavaScript, listen for a cookie with your unique name on it and once it is set, do a callback:

window.setInterval(function () {
    var cookie = $.cookie('abc');
        if (cookie !== null) {
            callback();
        }
}, 500);

You might also want to look into deleting the cookie when you are done.

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