Implement edit answer functionality with HTMX support; add new endpoint and template for editing stored answers in the marking UI.

anatomy/templates/anatomy/partials/mark2_edit_answer_fragment.html

@@ -0,0 +1,35 @@
+<div class="card mt-2">
+  <div class="card-body">
+    <h6 class="card-title">Edit stored answer</h6>
+    <form hx-post="{% url 'anatomy:mark2_edit_answer' %}" hx-target="closest .card" hx-swap="outerHTML">
+      {% csrf_token %}
+      <input type="hidden" name="question_pk" value="{{ question.pk }}">
+      <input type="hidden" name="original" value="{{ original }}">
+      {% if exam_pk %}
+        <input type="hidden" name="exam_pk" value="{{ exam_pk }}">
+      {% endif %}
+      {% if sk is not None %}
+        <input type="hidden" name="sk" value="{{ sk }}">
+      {% endif %}
+
+      <div class="mb-2">
+        <label class="form-label">Original</label>
+        <pre class="small bg-light p-2">{{ original }}</pre>
+      </div>
+
+      <div class="mb-2">
+        <label class="form-label">New answer text</label>
+        <textarea class="form-control" name="new_answer" rows="3">{% if existing %}{{ existing.answer }}{% else %}{{ original }}{% endif %}</textarea>
+      </div>
+
+      <div class="d-flex justify-content-end gap-2">
+        <button type="submit" class="btn btn-primary btn-sm">Save</button>
+        {% if exam_pk and sk is not None %}
+          <button type="button" class="btn btn-outline-secondary btn-sm" hx-get="{% url 'anatomy:mark2_exam_marked' exam_pk sk %}" hx-swap="outerHTML" hx-target="closest .card">Cancel</button>
+        {% else %}
+          <button type="button" class="btn btn-outline-secondary btn-sm" _="on click remove .card">Cancel</button>
+        {% endif %}
+      </div>
+    </form>
+  </div>
+</div>

anatomy/templates/anatomy/partials/mark2_exam_marked_fragment.html

@@ -1,13 +1,21 @@
 {% comment %}List of distinct answers submitted within this exam for the question, with counts and mark badges{% endcomment %}
 <div class="card mt-2">
   <div class="card-body">
+    <style>
+      /* Hide edit buttons and mark-action forms by default; show only when card has editing-enabled */
+      .card .edit-btn { display: none !important; }
+      .card.editing-enabled .edit-btn { display: inline-block !important; }
+      .card .mark-actions { display: none !important; }
+      .card.editing-enabled .mark-actions { display: inline-block !important; }
+    </style>
     <div class="d-flex justify-content-between align-items-center mb-2">
       <h6 class="card-title mb-0">Answers submitted in this exam</h6>
-      <div>
+      <div class="d-flex gap-2 align-items-center">
         <div class="btn-group btn-group-sm" role="group" aria-label="Order">
           <button class="btn btn-sm btn-outline-primary{% if request.GET.order == 'count' or not request.GET.order %} active{% endif %}" hx-get="{{ request.path }}?order=count" hx-swap="outerHTML" hx-target="closest .card">By count</button>
           <button class="btn btn-sm btn-outline-primary{% if request.GET.order == 'mark' %} active{% endif %}" hx-get="{{ request.path }}?order=mark" hx-swap="outerHTML" hx-target="closest .card">By score</button>
         </div>
+        <button type="button" class="btn btn-sm btn-outline-secondary" onclick="this.closest('.card').classList.toggle('editing-enabled'); this.textContent = this.closest('.card').classList.contains('editing-enabled') ? 'Disable editing' : 'Enable editing'">Enable editing</button>
       </div>
     </div>
     {% if not items %}
@@ -16,18 +24,35 @@
       <ul class="list-group">
         {% for it in items %}
           <li class="list-group-item d-flex justify-content-between align-items-center">
-            <div><pre class="mb-0">{{ it.answer }}</pre></div>
+            <div class="flex-grow-1 me-3"><pre class="mb-0">{{ it.answer }}</pre></div>
-            <div class="text-end">
+            <div class="text-end d-flex align-items-center gap-2">
+              {# Stored mark badge #}
               {% if it.mark == 'correct' %}
-                <span class="badge bg-success me-2" title="Stored answer marked as correct (2)">2</span>
+                <span class="badge bg-success me-1" title="Stored answer marked as correct (2)">2</span>
               {% elif it.mark == 'half-correct' %}
-                <span class="badge bg-warning text-dark me-2" title="Stored answer marked as half-correct (1)">1</span>
+                <span class="badge bg-warning text-dark me-1" title="Stored answer marked as half-correct (1)">1</span>
               {% elif it.mark == 'incorrect' %}
-                <span class="badge bg-danger me-2" title="Stored answer marked as incorrect (0)">0</span>
+                <span class="badge bg-danger me-1" title="Stored answer marked as incorrect (0)">0</span>
               {% else %}
-                <span class="badge bg-secondary me-2" title="No stored mark for this answer">-</span>
+                <span class="badge bg-secondary me-1" title="No stored mark for this answer">-</span>
               {% endif %}
+
+              {# Submission count badge #}
               <span class="badge bg-light text-dark me-2" title="Submitted {{ it.count }} times">{{ it.count }}</span>
+
+              <form hx-post="{% url 'anatomy:mark2_toggle_answer' %}" hx-target="closest .card" hx-swap="outerHTML" class="d-inline mark-actions">
+                {% csrf_token %}
+                <input type="hidden" name="question_pk" value="{{ question.pk }}">
+                <input type="hidden" name="answer" value="{{ it.answer }}">
+                <input type="hidden" name="exam_pk" value="{{ exam.pk }}">
+                <input type="hidden" name="sk" value="{{ sk }}">
+                <button class="btn btn-sm btn-outline-success" name="newmark" value="correct" title="Mark as correct (2)">2</button>
+                <button class="btn btn-sm btn-outline-warning text-dark" name="newmark" value="half-correct" title="Mark as half-correct (1)">1</button>
+                <button class="btn btn-sm btn-outline-danger" name="newmark" value="incorrect" title="Mark as incorrect (0)">0</button>
+                <button class="btn btn-sm btn-outline-secondary" name="newmark" value="clear" title="Clear stored mark">⨯</button>
+              </form>
+
+              <button class="btn btn-sm btn-outline-secondary edit-btn" hx-get="{% url 'anatomy:mark2_edit_answer' %}?question_pk={{ question.pk }}&original={{ it.answer|urlencode }}&exam_pk={{ exam.pk }}&sk={{ sk }}" hx-target="closest .card" hx-swap="outerHTML" title="Edit stored answer">Edit</button>
             </div>
           </li>
         {% endfor %}
@@ -35,3 +60,23 @@
     {% endif %}
   </div>
 </div>
+
+<script>
+  // Keep Edit buttons hidden by default; reveal them when the card receives
+  // the 'editing-enabled' class (toggled by the Enable editing button).
+  (function(){
+    document.querySelectorAll('.card').forEach(function(card){
+      function update(){
+        const enable = card.classList.contains('editing-enabled');
+        card.querySelectorAll('.edit-btn').forEach(function(b){
+          b.classList.toggle('d-none', !enable);
+        });
+      }
+      // run once in case HTMX inserted the fragment
+      update();
+      // observe class changes on the card to re-run update
+      const obs = new MutationObserver(update);
+      obs.observe(card, { attributes: true, attributeFilter: ['class'] });
+    });
+  })();
+</script>

anatomy/urls.py

@@ -107,6 +107,7 @@ urlpatterns = [
     path("exam/mark2/toggle", views.mark2_toggle_answer, name="mark2_toggle_answer"),
     path("exam/<int:exam_pk>/<int:sk>/mark2/exam_marked", views.mark2_exam_marked, name="mark2_exam_marked"),
     path("question/<int:pk>/mark2/question_marked", views.mark2_question_marked, name="mark2_question_marked"),
+    path("exam/mark2/edit_answer", views.mark2_edit_answer, name="mark2_edit_answer"),
 ]
 
 urlpatterns.extend(generic_view_urls(views.GenericViews))

anatomy/views.py

@@ -818,6 +818,24 @@ def mark2_toggle_answer(request):
         "incorrect": Answer.MarkOptions.INCORRECT,
     }
 
+    # Support clearing a stored answer (delete) via 'clear'
+    exam_pk = request.POST.get('exam_pk')
+    sk = request.POST.get('sk')
+
+    if newmark == 'clear':
+        a = Answer.objects.filter(answer_compare__iexact=answer_text, question_id=question.pk).first()
+        if a is not None:
+            # permission: ensure user can edit this answer
+            if not a.can_edit(request.user):
+                return JsonResponse({"status": "error", "message": "forbidden"}, status=403)
+            a.delete()
+        if request.htmx and exam_pk and sk is not None:
+            try:
+                return mark2_exam_marked(request, int(exam_pk), int(sk))
+            except Exception:
+                return JsonResponse({"status": "ok"})
+        return JsonResponse({"status": "ok"})
+
     if newmark not in mark_map:
         return JsonResponse({"status": "error", "message": "invalid mark"}, status=400)
 
@@ -833,6 +851,12 @@ def mark2_toggle_answer(request):
     a.status = status_val
     a.save()
 
+    if request.htmx and exam_pk and sk is not None:
+        try:
+            return mark2_exam_marked(request, int(exam_pk), int(sk))
+        except Exception:
+            return JsonResponse({"status": "ok"})
+
     return JsonResponse({"status": "ok"})
 
 
@@ -879,10 +903,71 @@ def mark2_exam_marked(request, exam_pk, sk):
     else:
         items.sort(key=lambda x: x.get('count', 0), reverse=True)
 
-    context = {'exam': exam, 'question': question, 'items': items}
+    context = {'exam': exam, 'question': question, 'items': items, 'sk': sk}
     return render(request, 'anatomy/partials/mark2_exam_marked_fragment.html', context)
 
 
+@login_required
+def mark2_edit_answer(request):
+    """HTMX-friendly endpoint to edit/create a stored Answer for a question.
+
+    GET: returns a small form fragment.
+    POST: updates/creates the Answer and, if exam_pk/sk provided, returns the
+    refreshed exam-marked fragment so the UI updates in-place.
+    """
+    if request.method == 'GET' and request.htmx:
+        question_pk = request.GET.get('question_pk')
+        original = request.GET.get('original', '')
+        exam_pk = request.GET.get('exam_pk')
+        sk = request.GET.get('sk')
+        question = get_object_or_404(AnatomyQuestion, pk=question_pk)
+        # Try to find an existing Answer by compare
+        existing = question.answers.filter(answer_compare__iexact=original).first()
+        context = {
+            'question': question,
+            'original': original,
+            'existing': existing,
+            'exam_pk': exam_pk,
+            'sk': sk,
+        }
+        return render(request, 'anatomy/partials/mark2_edit_answer_fragment.html', context)
+
+    if request.method == 'POST' and request.htmx:
+        question_pk = request.POST.get('question_pk')
+        original = request.POST.get('original', '')
+        new_text = request.POST.get('new_answer', '').strip()
+        exam_pk = request.POST.get('exam_pk')
+        sk = request.POST.get('sk')
+
+        if not question_pk or not new_text:
+            return HttpResponse('Missing parameters', status=400)
+
+        question = get_object_or_404(AnatomyQuestion, pk=question_pk)
+
+        a = question.answers.filter(answer_compare__iexact=original).first()
+        if a is None:
+            a = Answer()
+            a.question = question
+            a.answer = new_text
+        else:
+            a.answer = new_text
+
+        a.save()
+
+        # If we have exam context, refresh the exam-marked fragment for that question
+        if exam_pk and sk is not None:
+            # delegate to mark2_exam_marked to re-render the card
+            try:
+                return mark2_exam_marked(request, int(exam_pk), int(sk))
+            except Exception:
+                return HttpResponse('OK')
+
+        return HttpResponse('OK')
+
+    # Fallback: forbidden for non-HTMX or other methods
+    raise PermissionDenied()
+
+
 @login_required
 def mark2_question_marked(request, pk):
     """Return a partial listing of all stored Answer choices for this question (grouped by status)."""