Refactor exam take functionality to support HTMX for dynamic question loading and navigation

physics/views.py

@@ -302,6 +302,77 @@ def exam_take(request, pk: int, sk: int, cid: str | None = None, passcode: str |
     )
 
 
+def exam_take_fragment(request, pk: int, sk: int, cid: str | None = None, passcode: str | None = None):
+    """Return an HTMX partial containing the question form and navigation controls.
+
+    This view mirrors the GET rendering logic of `exam_take` but returns a fragment
+    suitable for being loaded via HTMX into the page. It intentionally does not
+    process POSTs (the main `exam_take` endpoint handles form submissions and
+    redirects) to keep fragment logic focused on rendering.
+    """
+
+    exam = get_object_or_404(Exam, pk=pk)
+
+    if not exam.active:
+        return exam_inactive(request, context={"exam": exam})
+
+    exam.check_user_can_take(cid, passcode, request.user)
+
+    cid_user_exam = exam.get_or_create_cid_user_exam(cid=cid, user_user=request.user)
+
+    # Canonical questions list for consistent indexing/navigation
+    questions = list(exam.get_questions())
+
+    try:
+        index = int(sk)
+    except Exception:
+        raise Http404("Invalid question index")
+
+    if index < 0 or index >= len(questions):
+        raise Http404("Question not found in exam")
+
+    question = questions[index]
+    exam_length = len(questions)
+    pos = index
+
+    if cid is not None:
+        answer = question.cid_user_answers.filter(cid=cid, exam=exam).first()
+    else:
+        answer = question.cid_user_answers.filter(user=request.user, exam=exam).first()
+
+    if answer is not None:
+        form = UserAnswerForm(instance=answer)
+        saved_answer = [answer.a, answer.b, answer.c, answer.d, answer.e]
+    else:
+        form = UserAnswerForm()
+        saved_answer = False
+
+    previous = -1
+    if sk > 0:
+        previous = sk - 1
+    next = sk + 1
+    if sk == exam_length - 1:
+        next = False
+
+    return render(
+        request,
+        "physics/partials/exam_take_fragment.html",
+        {
+            "form": form,
+            "cid": cid,
+            "exam": exam,
+            "question": question,
+            "next": next,
+            "previous": previous,
+            "exam_length": exam_length,
+            "pos": pos,
+            "saved_answer": saved_answer,
+            "passcode": passcode,
+            "cid_user_exam": cid_user_exam,
+        },
+    )
+
+
 # def loadJsonAnswer(answer):
 #    # As access is not restricted make sure the data appears valid
 #    if (not isinstance(answer["cid"], int)) or (not isinstance(answer["eid"], int)):