Adds progressbar configurations default, async and none. The configuration values are explained in the example/settings.py file

example/settings.py

@@ -124,7 +124,26 @@ LANGUAGES = (
     ('de', 'Deutsch'),
 )
 
-REPLACEMENTSTRING = u'subst_with_ans_'
+# Defines the progressbar behavior in the questionnaire
+# the possible options are 'default', 'async' and 'none'
+#
+#   'default'
+#   The progressbar will be rendered in each questionset together with the 
+#   questions. This is a good choice for smaller questionnaires as the 
+#   progressbar will always be up to date.
+#
+#   'async'
+#   The progressbar value is updated using ajax once the questions have been
+#   rendered. This approach is the right choice for bigger questionnaires which
+#   result in a long time spent on updating the progressbar with each request.
+#   (The progress calculation is by far the most time consuming method in 
+#    bigger questionnaires as all questionsets and questions need to be
+#    parsed to decide if they play a role in the current run or not)
+#
+#   'none'
+#   Completely omits the progressbar. Good if you don't want one or if the
+#   questionnaire is so huge that even the ajax request takes too long.
+QUESTIONNAIRE_PROGRESS = 'async'
 
 try: from local_settings import *
 except: pass

questionnaire/static/progress.js

@@ -0,0 +1,21 @@
+(function($){
+    $(document).ready(function() {
+        var request = {
+            type: 'GET',
+            url: progress_url,
+            dataType: 'json',
+            success: function(data) {
+                var progress = data.progress;
+                console.log(progress);    
+
+                var bar = $('#progress_bar').find('.ui-progress');
+                bar.animate({'width': progress.toString() + '%'});
+            },
+            error: function(e) {
+                console.log(e);
+            }
+        };
+
+        $.ajax(request);
+    });
+})(jQuery);

questionnaire/templates/questionnaire/questionset.html

@@ -13,6 +13,13 @@
     {% for x in cssinclude %}
         <link rel="stylesheet" href="{{ x }}" type="text/css" />
     {% endfor %}
+
+    {% if async_progress %}
+        <script type="text/javascript">
+            var progress_url = "{{ async_url }}";
+        </script>
+        <script type="text/javascript" src="{{ STATIC_URL }}progress.js"></script>
+    {% endif %}
 {% endblock %}
 
 {% block language %}

questionnaire/urls.py

@@ -8,6 +8,8 @@ urlpatterns = patterns('',
             questionnaire, name='questionnaire_noargs'),
     url(r'^csv/(?P<qid>\d+)/',
             export_csv, name='export_csv'),
+    url(r'^(?P<runcode>[^/]+)/progress', 
+            get_async_progress, name='progress'),
     url(r'^(?P<runcode>[^/]+)/(?P<qs>[-]{0,1}\d+)/$',
             questionnaire, name='questionset'),
     url(r'^(?P<runcode>[^/]+)/',

questionnaire/views.py

@@ -3,6 +3,7 @@
 from django.http import HttpResponse, HttpResponseRedirect
 from django.template import RequestContext
 from django.core.urlresolvers import reverse
+from django.core.cache import cache
 from django.contrib.auth.decorators import permission_required
 from django.shortcuts import render_to_response, get_object_or_404
 from django.db import transaction
@@ -182,6 +183,15 @@ def get_progress(runinfo):
 
     return int(progress)
 
+def get_async_progress(request, runcode):
+    """ Returns the progress as json for use with ajax """
+
+    runinfo = get_runinfo(runcode)
+    response = dict(progress=get_progress(runinfo))
+
+    cache.set('progress' + runinfo.random, response['progress'])
+    return HttpResponse(json.dumps(response), mimetype='application/javascript')
+
 def fetch_checks(questionsets):
     ids = [qs.pk for qs in questionsets]
     
@@ -487,7 +497,16 @@ def show_questionnaire(request, runinfo, errors={}):
                 
         qlist.append( (question, qdict) )
 
-    progress = get_progress(runinfo)
+    has_progress = settings.QUESTIONNAIRE_PROGRESS in ('async', 'default')
+    async_progress = settings.QUESTIONNAIRE_PROGRESS == 'async'
+
+    if has_progress:
+        if async_progress:
+            progress = cache.get('progress' + runinfo.random, 1)
+        else:
+            progress = get_progress(runinfo)
+    else:
+        progress = 0
 
     if request.POST:
         for k,v in request.POST.items():
@@ -509,7 +528,10 @@ def show_questionnaire(request, runinfo, errors={}):
         triggers=jstriggers,
         qvalues=qvalues,
         jsinclude=jsinclude,
-        cssinclude=cssinclude)
+        cssinclude=cssinclude,
+        async_progress=async_progress,
+        async_url=reverse('progress', args=[runinfo.random])
+    )
     r['Cache-Control'] = 'no-cache'
     r['Expires'] = "Thu, 24 Jan 1980 00:00:00 GMT"
     return r