Question

我在这里有一种情况：一个HTML表单页面，在提交时返回基于POST值的Excel/PDF/Word文档，如果不是，则返回错误HTML。

关于友好的UI，如果一切正常，希望下载，或者显示一个错误对话框，而不导航到错误页面。下载效果良好。但在HTML的情况下，它会根据响应进行导航。

其他详细信息：

有什么帮助吗？

Answer 1

Have the form submit to a hidden iframe.
The form includes a hidden field with the name of a cookie the response should set (on success or failure).
I show a nice message like "Generating your report" or whatever and poll for the cookie.
If the generation is successful, I ll see the cookie with the value "OK" (or similar); this tells me to take down my "generating" message and stop polling.
If the generation fails, I ll see the cookie with the value "Error" (or similar); this tells me to read the full error message from the contents of the iframe and show the error to the user.
I use a timeout (but a long one, five minutes or something) and also let the user cancel the polling.
When returning the PDF, I use a Content-Disposition header to ~~tell~~ suggest to the browser that it should offer to save the result (value attachment) or show it inline (value inline).