The issue with Django not updating CSS and JS when using DetailView

Utilizing inline formsets within the DetailView class has been a gamechanger for me.

class DetailView(DetailView)

To ensure proper rendering of the page, I made use of the get_context_data function:

def get_context_data(self, *args, **kwargs):
    context = super(QuestionDetailView, self).get_context_data(**kwargs)
    context['formset'] = self.get_formset()
    context['question'] = self.get_object()
    return context

The CSS and JavaScript functionality on this page is flawless. However, I am struggling to find a solution for rendering the page effectively when the formset is invalid.

def post(self, request, slug):
    [...]
    formset = self.AnswerFormset(request.POST, instance=self.get_object())  # create/edit an answer
    if formset.is_valid():
        return self.form_valid(formset, slug)
    else:
        return render(request, 'questions/detail.html', {'slug': slug, 'formset': formset,'question':self.get_object()})


def form_valid(self, formset, slug):
    formset.save()
    return redirect('questions:question_detail', slug=slug)

When the formset is valid, everything works well in terms of styles and JavaScript. However, if there are errors in the form, the styling and scripts from questions/detail.html do not function correctly.

I have tried various approaches to handle form errors within get_context_data, but without success. As a workaround, I ended up rendering the page separately (return render(request, 'questions/detail.html', {'slug': slug, 'formset': formset,'question':self.get_object()})

If you have any insights on how to properly render the page with form errors, I'd greatly appreciate it. Cheers

Answer №1

Your approach to overriding the post and form_valid methods may suggest that a DetailView is not the best choice for this situation. Have you considered using a FormView class-based view instead? More information can be found at this link.

A FormView will provide the necessary definitions for form_valid, post, etc without requiring you to override them.

Additionally, overriding the get_context_data method is a good practice if you need to add more elements to your context. Consider sticking with this approach if you still want to access the original object intended for display in your template through the DetailView.

Considering the checks you need to perform on your form, switching to a FormView rather than a DetailView would likely be more appropriate. You can then supplement any missing functionalities through the context.

Answer №2

In the case of an error, widgets belonging to a different form group will be created, resulting in them not having any unique settings.

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