浏览器下载完成事件 [英] Browser download complete event

问题描述

我们一直在寻找一个答案，但还没有找到解决方案。

We've been looking for a while for an answer to this, but haven't found a solution.

我们有一个Web服务器，允许用户下载文件（pdf），它们是从servlet动态生成和提供的。我们想知道什么时候下载完成（以及如何成功，失败了，用户是否取消了？）。

We have a web server, which allows the user to download files (pdfs), which are dynamically-generated and served from servlets. We'd like to know when a download has completed (and how: was it successful, did it fail, did the user cancel?).

有没有办法知道这个没有用户输入？这些文件相对较小，因此不需要进度条功能，但是我们需要某种终止钩，当下载完成后会报告回来。这可能吗？

Is there a way to know this without user input? These files are relatively small so no progress-bar functionality is needed, but we need some sort of "end-hook" which reports back when the download has finished. Is this possible?

浏览器端可以检测到最终的下载并通过ajax报告回服务器的功能？

[edit] What capability would there be on the browser-side that can detect end-of-download and report back to the server via ajax?

推荐答案

除非你收到网络错误，否则你不知道。唯一的方法是让浏览器向服务器发送第二个事件（使用AJAX）来确认下载是否已成功完成。

Unless you get a network error, you cannot know. The only way is to have the browser to send a second event to the server (using AJAX) to acknowledge the download was completed successfully.

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