How to redirect to url by cancel button in django-crispy-forms?

Question

class StudentCreateView(CreateView):
    model = Student
    template_name = "students/students_edit.html"
    form_class = StudentCreateForm

def get_success_url(self):
    return u'%s?status_message=Студент успішно створений' % reverse('home')

def post(self, request, *arg, **kwargs):
    if request.POST.get('cancel_button'):
        messages.info(self.request, u"Створення скасовано")
        return HttpResponseRedirect(
            u'%s?status_message=Створення скасовано'
            % reverse('home'))
    else:
        messages.success(self.request, u"Студент успішно створений") 
        return super(StudentCreateView, self).post(
            request,*arg, **kwargs)
def get_context_data(self, **kwargs):
    context = super(StudentCreateView, self).get_context_data(**kwargs)
    context['meta'] = u'Додавання студента'
    context['headtext'] = context['meta']
    return context

In this view i check in post function if is clicked cancel button

self.helper.layout[-1] = FormActions(
        Submit('add_button',u'Зберегти', css_class='btn btn-primary'),
        Submit('cancel_button', u'Скасувати'),
        )

Only on createview submit cancel is not working properly. On click it tries to check form and crispy answers me to solve all problems on form when i want to cancel. I've changed submit to button and button cancel have no effect at all. I've found a variant on stackoverflow with adding onclick method to button, but it's not for me( When i cancel or post form on redirected window info message tells me a status of posting or canceling. So when i tried onclick method it pushed on past page, so info message wasn't shown. How to fix cancel on CreateView?

Answer 1

Add Cancel button and use window.location.href within onclick event:

self.helper.add_input(Button('cancel', 'Cancel', css_class='btn-primary',
                             onclick="window.location.href = '{}';".format(reverse('your-cancel-url-name'))))

Answer 2

Another way if you prefer is to pass the HTML as is:

    from crispy_forms.layout import HTML
    self.helper.layout = Layout(
            Fieldset(
                'Title',
                'field1',
                'field2',
                'field3'
            ),
            FormActions(
                        Submit('save', 'Save'),
                        HTML('<a class="btn btn-primary" href="/">Cancel</a>')
                    )
     )

Answer 3

self.helper.layout.append(
            FormActions(
                submit,
                Submit('cancel_button', u'Скасувати', css_class="btn btn-link"),
            )
        )