Django - 通用 FormView - 将输入传递到模板中

Question

Using, Django==2.1.7, and python3.7 - I am really struggling using FormView - see below script.

How can I pass variable search_string submitted via the form and the value within context["new_context_entry"] added via get_context_data - to the success_url, so those values can be rendered in my template on form submission?

class ConfigSearchTest(FormView):
    template_name = 'archiver_app/config_view.html'
    form_class = forms.DeviceSearchForm
    success_url = 'archiver/search_results/'



    def form_valid(self,form):
        search_string = form.cleaned_data['search_string']
        return super(ConfigSearchTest,self).form_valid(form)

    def get_context_data(self, **kwargs):          
        context = super().get_context_data(**kwargs)                     
        new_context_entry = "adding additional"
        context["new_context_entry"] = new_context_entry
        return context

Answer 1

You have done enough to pass something to the template already, you don't need to put it in the URL.

my_template.html

{{ new_context_entry }}  # should render as 'adding additional'

If you like, you can also pass URL query parameters to the template. Test it by typing into your browser URL bar before proceeding further myurl.com?q=testingtesting . Something like this should work (there may be some typos as repl.it is playing up):

my_views.py

class ConfigSearchTest(FormView):
    template_name = 'archiver_app/config_view.html'
    form_class = forms.DeviceSearchForm
    success_url = 'archiver/search_results/'

    def get_context_data(self, **kwargs):          
        context = super().get_context_data(**kwargs)                     
        new_context_entry = "adding additional"
        context["new_context_entry"] = new_context_entry
        context["query_params"] = self.request.GET.get("q", "a default") # should be testingtesting
        return context

my_template.html

{{ new_context_entry }}  # should render as 'adding additional'
{{ query_params }}  # should render as 'testingtesting'

If you then want to add ?q=testingtesting to a URL when submit is clicked on your form, you can do some magic in get_success_url:

my_views.py

class ConfigSearchTest(FormView):
    template_name = 'archiver_app/config_view.html'
    form_class = forms.DeviceSearchForm
    success_url = 'archiver/search_results/'

    def get_success_url(self):          
        # called automatically after form_valid()
        return self.success_url + '?q=' + self.query_string 

    def form_valid(self, form):
        # called when the form is submitted
        self.query_string = form.cleaned_data['query_string']
        return super(SearchFormView, self).form_valid(form)

    def get_context_data(self, **kwargs):   
        # called whenever the pages is rendered       
        context = super().get_context_data(**kwargs)                     
        new_context_entry = "adding additional"
        context["new_context_entry"] = new_context_entry
        context["query_params"] = self.request.GET.get("q", "a default") # should be testingtesting
        return context