diff -r 3a34fc74e0d2 -r 91bc8521e3cb web/hdalab/views/ajax.py
--- a/web/hdalab/views/ajax.py	Sun Sep 09 21:56:43 2012 +0200
+++ b/web/hdalab/views/ajax.py	Thu Oct 04 12:25:12 2012 +0200
@@ -6,7 +6,7 @@
 '''
 from django.conf import settings
 from django.core.cache import cache
-from django.db.models import Q, Count
+from django.db.models import Q, Count, Min
 from django.http import HttpResponse
 from hdabo.models import Tag, Datasheet, TaggedSheet
 from hdalab.models import HdaSession, Country, TagYears, DatasheetExtras
@@ -479,4 +479,37 @@
         outputstr = json.dumps(output)
         cache.set(cache_key, outputstr)
         
-    return HttpResponse(content=outputstr, mimetype='application/json')
\ No newline at end of file
+    return HttpResponse(content=outputstr, mimetype='application/json')
+
+def subtree(tree):
+    MAX_TAG_ORDER = 8
+    label = tree['label']
+    sub = tree.get('contents',[])
+    
+    datasheets = Datasheet.objects.filter(validated = True, taggedsheet__tag__label__iexact = label, taggedsheet__order__lte = MAX_TAG_ORDER).annotate(tagorder=Min('taggedsheet__order')).select_related('organisation').distinct()
+    
+    contents = [{ 'description': ds.description, 'title': ds.title, 'url': ds.url, 'score': MAX_TAG_ORDER - ds.tagorder, 'id': ds.id, 'hda_id': ds.hda_id, 'organization': ds.organisation.name } for ds in datasheets]
+    
+    contents = sorted(contents, key=lambda e: -e['score'])
+    
+    res = { 'category': label }
+    
+    if len(contents):
+        res['contents'] = contents
+    
+    if len(sub):
+        subcats = [subtree(st) for st in sub]
+        subcats = [sc for sc in subcats if len(sc.get('contents',[])) or len(sc.get('sub_categories',[]))]
+        res['sub_categories'] = subcats
+    
+    return res
+
+def filltree(request):
+    
+    tree = request.GET.get('tree','{}')
+    
+    treeobj = json.loads(tree)
+    
+    res = subtree(treeobj)
+        
+    return HttpResponse(content=json.dumps(res), mimetype='application/json')