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i have a method in views.py that can download a file
i've constructed via an HttpResponse['Content-Disposition']
attachment:
response = HttpResponse(content_type='text/json')
response['Content-Disposition'] = 'attachment; filename="%s"' % (dgjf)
response.write(dgjson)
this works fine if my the method returns response
but, after the download i want to redirect to a confirmation page that i render like this:
confirmMsg = render(request,'confirmation.html',context)
which i would normally return from the same method.
but how can i get the response to do download AND also redirect to the confirmation?
715
Abid covers it, render is usually used to load a template and a context, while HttpResponse is usually for data. As it's bad practice to "respond" with html. Render is essentially a shortuct for HttpResponse , It provides a more effective way to modify templates, and load data dynamically.
However, it can sometimes be beneficial to allow decorators or middleware to modify a response after it has been constructed by the view. For example, you may want to change the template that is used, or put additional data into the context. TemplateResponse provides a way to do just that.
HttpResponse (source code) provides an inbound HTTP request to a Django web application with a text response. This class is most frequently used as a return object from a Django view.
You need to redirect to the after/confirmation page first, and then force the download. Your after-page would say something like "Your download should start automatically, if not click.. etc.".
From the after page you initiate the download either through Javascript, http-refresh, or an iframe.
Javascript, in your after-page template insert:
<script>location.href="download/url/here";</script>
http-refresh, in your after-page view, annotate the HttpResponse before returning it:
response = render_to_response(...)
response['Refresh'] = "0;url=/download/url/here"
return response
..or add the following tag to the header of your after-page (the 0 before url is the number of seconds to wait before redirecting):
<meta http-equiv="Refresh" content="0;url=/download/url/here">
an iframe would simply be (you'll probably need to remove borders etc. too):
<iframe src="/download/url/here" style="width:0;height:0"></iframe>
The idea behind all of these is that a download doesn't change the pixels on the screen, so initializing the download once you have the after-page on-screen will look like the page is downloading the file (and not look like it is redirecting - which is what it's really doing).
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