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

physics/views.py

@@ -266,16 +266,28 @@ def exam_take(request, pk: int, sk: int, cid: str | None = None, passcode: str |
             take_url = "physics:exam_take_user"
             finish_url = "physics:exam_take_overview_user"
 
+        # Support HTMX: if this is an HX request, return the fragment HTML for the
+        # destination question instead of issuing a full-page redirect. This lets
+        # the client swap only the question fragment.
+        is_htmx = request.headers.get("HX-Request") == "true" or request.META.get("HTTP_HX_REQUEST")
+
         if "next" in request.POST:
             if not next:
                 return HttpResponseBadRequest("Invalid request")
+            if is_htmx:
+                return exam_take_fragment(request, pk=pk, sk=pos + 1, cid=cid, passcode=passcode)
             return redirect(take_url, sk=pos + 1, **kwargs)
         elif "previous" in request.POST:
+            if is_htmx:
+                return exam_take_fragment(request, pk=pk, sk=pos - 1, cid=cid, passcode=passcode)
             return redirect(take_url, sk=pos - 1, **kwargs)
         elif "finish" in request.POST:
             return redirect(finish_url, **kwargs)
         elif "goto" in request.POST:
-            return redirect(take_url, sk=int(request.POST.get("goto")), **kwargs)
+            dest = int(request.POST.get("goto"))
+            if is_htmx:
+                return exam_take_fragment(request, pk=pk, sk=dest, cid=cid, passcode=passcode)
+            return redirect(take_url, sk=dest, **kwargs)
     else:
         form = UserAnswerForm(instance=answer)