Adding javascript to a Django redirect (HttpResponse)

Question

I am using a redirect in Django from django.shortcuts import redirect

What I want, is for the user to be displayed a Javascript alert message before being redirected.

Here is what I've got so far:

response = redirect("someUrl")
response.write('<script>alert(\'You must remove an item before adding another\');</script>')
response['location'] += "?active=" + "all"
return response

The redirect works, but the Javascript does not. I also tried

response = HttpResponse('<script>alert(\'You must remove an item before adding another\');</script>')
return response

This triggers the alert window, but I'm not sure how to add an equivalent redirect as the method above.

Answer 1

You can use js appproach window.location

url = 'someUrl'
resp_body = '<script>alert("You must remove an item before adding another");\
             window.location="%s"</script>' % url
return HttpResponse(resp_body)

Answer 2

You are getting confused between frontend and backend. When this view is requested by the user, the server (via Django's HTTPResponseRedirect) is sending a 302 redirect HTTP response that tells the browser to redirect to a different page. This is different to a normal 200 response (i.e. a normal Django response object, not a redirect) within which you could include a javascript alert.

You need to show that javascript on the view you are initially loading before the user is returned the redirect response.