How can I get Django Form ModelChoiceField values from Class View back to the template from which th-CodePudding

I am trying to display a list of tests, select one with ModelChoiceField Form and then display the selected test information on the same template the ModelChoiceField is on. (2 fields - the ID number and the name) as a link. So basically you select the test, it appears under the ModelChoiceField as a link and then you click it go to a detail screen. I can capture the selected choice information in the class view in form_valid but I don't know how to return to the template with this new information. Tried various approaches with context etc. but nothing is working.

The screen will look something like this:

When you press the select button the test selected will appear on the same screen. I need access to both the name and id number, which I get in form_valid

# forms.py
class TestBrowseForm(forms.Form):
    choice = forms.ModelChoiceField(
        Universal_Test_File.objects.all().order_by('test_name'), to_field_name="service_id")

# views.py
class ListTests(FormView):
    model = Universal_Test_File
    context_object_name = "testlist"
    form_class = TestBrowseForm
    template_name = "lab/list_tests.html"
    success_url = '/list_tests/'

    def form_valid(self, form):
        # choice is a queryset with both service_id and testname so we need to specify service_id
        choice = form.cleaned_data.get("choice")
        ## I want to display the test_name and link to service_id
        print(choice.service_id)
        print(choice.test_name)

        return super().form_valid(form)

#models.py

class Universal_Test_File(models.Model):
    service_id = models.CharField(max_length=200, unique=True)
    test_name = models.CharField(max_length=200)
    specimen = models.CharField(max_length=200, blank=True)

    def __str__(self):
        return self.test_name

#HTML
<div >
      <div ", method="post" novalidate>
               {% csrf_token %}
               {{form}}
 
                <div >        
                      <input type="submit" name="choice"/>
                </div>
            </form>
                    
               

                <div > 
                    <p class= mt-5>Select one or more tests using Shift and Control (Command on a Mac)</p>
                </div>

CodePudding user response：

You have to make POST request to same view you are in with some extra context, 'choice' in your case as I can see. You can pass it from kwargs with get_context_data.

class ListTests(FormView):
    ...
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        if 'choice' in self.kwargs:
            some_id = self.kwargs['choice']      # or kwargs
            context['extra_file'] = Universal_Test_File.objects.get(id=some_id)

        return context

Then in template:

{% if extra_file %}
    # Your detailed content
{% endfor %}

This depends on how you query the object you need. You definitely should not use form_valid for this, because it should be for form validation only (it might cross your further actions later).

I strongly recommend to use simple JS as next step (htmx is perfect for this job I believe) to use it without refreshing site.

CodePudding user response：

I decided to take an entirely different approach since the one I was taken seems more suited to JS.