Javascript 从服务器下载文件的最佳方式是什么
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What is the best way to download file from server
提问by Arbejdsgl?de
I have interesting task which requires me to download a dynamically generated file from a server (ASP.NET) to the client. On the client side it is just JavaScript (jQuery) and the client is able to generate a lot of parameters to customize how the data is exported.
我有一个有趣的任务，需要我从服务器 (ASP.NET) 将动态生成的文件下载到客户端。在客户端，它只是 JavaScript (jQuery)，并且客户端能够生成大量参数来自定义数据的导出方式。
What is the best way to do download the file from the server? Should I use a WCF service such as what is described hereor simple page like this one?
从服务器下载文件的最佳方法是什么？我应该使用 WCF 服务，例如这里描述的内容还是像这样的简单页面？
I don't know how to download a file without reloading the page (I'm not sure that $.ajax will work in this case). Could someone please give me some direction on this topic? Thanks.
我不知道如何在不重新加载页面的情况下下载文件（我不确定 $.ajax 在这种情况下是否有效）。有人可以就这个主题给我一些指导吗？谢谢。
回答by Aristos
First you can create the file from a handler .ashx
首先，您可以从处理程序创建文件 .ashx
Let say that you have the file for downloading at download.ashxand you have some parametres to pass from your javascript, eg download.ashx?p1=8827&p2=8831to know what you going to create.
假设您有要下载的文件，download.ashx并且您有一些参数要从您的 javascript 传递，例如，download.ashx?p1=8827&p2=8831要知道您要创建什么。
Then on your javascript you simple can make a redirect as
然后在您的 javascript 上，您可以简单地进行重定向
window.location = "download.ashx?p1=8827&p2=8831";
or alternative you can use the window.openfor do the same think
或者你可以使用window.openfor 做同样的想法
window.open("download.ashx?p1=8827&p2=8831");
and your file will start the download.
您的文件将开始下载。
Just make sure that you have set the header of attachment, and the correct contenttype on your handle eg:
只需确保您已设置附件标题，以及句柄上的正确内容类型，例如：
HttpContext.Current.Response.ContentType = "application/octet-stream";
HttpContext.Current.Response.AddHeader("Content-Disposition",
"attachment; filename=" + SaveAsThisFileName);
Simple and clear, both tested and working.
简单明了，经过测试和工作。
Also you may interesting on this answer: How to handle errors.
您也可能对这个答案感兴趣：如何处理错误。
