django display message after POST form submit

Question

I have a page with a POST form, that have a action set to some url.
i.e assume this page url is /form_url/ : ..

The view in /sub

Answer 1

For Class Based Views use self.request

I also use self.request.path_info in my return

from django.contrib import messages

class MyCreateView(CreateView):
    ...
       def form_valid(self, form):
          ....
          self.object.save()

          messages.success(self.request, 'Form submission successful')
          
          return HttpResponseRedirect(self.request.path_info)

Same template as damio's answer:

{% if messages %}
<ul class="messages">
    {% for message in messages %}
    <li  {% if message.tags %} class=" {{ message.tags }} " {% endif %}> {{ message }} </li>
    {% endfor %}
</ul>
{% endif %}

Answer 2

from django.contrib.messages.views import SuccessMessageMixin
from django.views.generic.edit import CreateView 
from myapp.models import Author

class AuthorCreate(SuccessMessageMixin, CreateView):
    model = Author
    success_url = '/success/'
    success_message = "%(name)s was created successfully"

https://docs.djangoproject.com/en/1.11/ref/contrib/messages/

Answer 3

You don't need to do a redirect to clear the form data. All you need to do is re-instantiate the form:

def your_view(request):
    form = YourForm(request.POST or None)
    success = False
    if request.method == 'POST':
        if form.is_valid():
            form.save()
            form = YourForm()
            success = True
    return render(request, 'your_template.html', {'form': form})

If the user refreshes the page, they're going to initiate a GET request, and success will be False. Either way, the form will be unbound on a GET, or on a successful POST.

If you leverage the messages framework, you'll still need to add a conditional in the template to display the messages if they exist or not.

Answer 4

Django messages framework stores the messages in the session or cookie (it depends on the storage backend).

Answer 5

The django admin uses django.contrib.messages, you use it like this:

In your view:

from django.contrib import messages

def my_view(request):
    ...
       if form.is_valid():
          ....
          messages.success(request, 'Form submission successful')

And in your templates:

{% if messages %}
<ul class="messages">
    {% for message in messages %}
    <li  {% if message.tags %} class=" {{ message.tags }} " {% endif %}> {{ message }} </li>
    {% endfor %}
</ul>
{% endif %}