我有一个javascript应用程序,发送ajax POST请求到某个URL。Response可以是JSON字符串,也可以是文件(作为附件)。我可以很容易地在ajax调用中检测到Content-Type和Content-Disposition,但是一旦我检测到响应包含一个文件,我如何让客户端下载它呢?我在这里读过一些类似的帖子,但没有一个能提供我想要的答案。
请,请,请不要发布建议我不应该使用ajax或我应该重定向浏览器的答案,因为这些都不是一个选项。使用普通的HTML表单也是不可行的。我所需要的是向客户端显示一个下载对话框。这能做到吗?如何做到?
为了让乔纳森赔罪的答案在边缘工作,我做了以下改变:
var blob = typeof File === 'function'
? new File([this.response], filename, { type: type })
: new Blob([this.response], { type: type });
这个
var f = typeof File+"";
var blob = f === 'function' && Modernizr.fileapi
? new File([this.response], filename, { type: type })
: new Blob([this.response], { type: type });
我宁愿把这篇文章作为评论发表,但我在这方面没有足够的声誉
我想指出在接受的答案中使用这种技术时出现的一些困难,即使用表单post:
You can't set headers on the request. If your authentication schema involves headers, a Json-Web-Token passed in the Authorization header, you'll have to find other way to send it, for example as a query parameter.
You can't really tell when the request has finished. Well, you can use a cookie that gets set on response, as done by jquery.fileDownload, but it's FAR from perfect. It won't work for concurrent requests and it will break if a response never arrives.
If the server responds with a error, the user will be redirected to the error page.
You can only use the content types supported by a form. Which means you can't use JSON.
我最终使用在S3上保存文件并发送预签名URL来获取文件的方法。