Rails文件下载和查看更新 - Howto？ [英] Rails File Download And View Update - Howto?

问题描述

这似乎应该是直截了当的，但我很难过。我有一个视图控制器的链接，最终使用send_data将文件下载到用户的硬盘驱动器。这非常有效，它使当前视图显然不受影响。

This seems like it should be straight-forward, but I'm stumped. I have a link to a view controller that ends up using send_data to download a file to the user's hard drive. This works very well, and it leaves the current view apparently untouched.

但现在我希望该页面在下载完成后提供一些反馈。在send_data方法调用之前，我天真地在控制器中添加了类似下面的代码：

But now I would like the page to provide some feedback after that download is complete. I naively put something like the following code in the controller before the send_data method call:

flash[:notice] = "Nice work, hot shot!"
send_data file, :filename=>fullname+".txt", :type=>"text/plain"

但这不起作用，因为当前视图没有重新加载，让我有机会显示flash var。

But that doesn't work, because the current view doesn't reload to give me a chance to display the flash var.

我'我还尝试为此操作添加一个RJS视图，但这导致旧的DoubleRender错误，因为send_data也是一个渲染操作。

I've also tried adding an RJS view for this action, but that resulted in the old DoubleRender error, because send_data is a render action as well.

所以......呃。 ..运行send_data后，如何将数据传回当前视图？或者是否有另一种解决此问题的方法？

So... uh... how the heck would one pass data back to the current view after running send_data? Or is there another approach to this problem?

谢谢！
Aaron。

Thanks! Aaron.

推荐答案

也许你可以在响应中设置一个cookie，并在链接时使用javascript对该cookie进行轮询单击下载文件。

Perhaps you could set a cookie in the response and poll for that cookie with javascript when the link to download the file is clicked.

可以像这样设置cookie：

The cookie can be set like this:

cookies["download_finished"] = "true"
send_data file, :filename=>fullname+".txt", :type=>"text/plain"

然后定期使用您最喜欢的javascript框架获取该cookie。

Then just periodically for that cookie using your favorite javascript framework.

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