Apply filtering to ICS button.

src/program/static/js/event_instance_websocket.js

@@ -108,6 +108,7 @@ function render() {
     parameters = get_parameters();
     toggleFilterBoxes(parameters['types'], parameters['locations']);
     render_day_menu(parameters['day']);
+    setICSButtonHref(location.search);
 
     if(parameters['day'] != null) {
       render_day(parameters['types'], parameters['locations'], parameters['day']);
@@ -473,6 +474,13 @@ function setHistoryState(parts) {
   }
 
   history.replaceState({}, '', query);
+  setICSButtonHref(query);
+}
+
+function setICSButtonHref(query) {
+  // Update ICS button as well
+  var ics_button = document.querySelector('#ics-button');
+  ics_button.setAttribute('href', CONFIG['ics_button_href'] + query);
 }
 
 function toggleFilterBoxes(types, locations) {

src/program/templates/schedule_base.html

@@ -73,7 +73,7 @@
                     </ul>
                 </div>
 
-                <a href="{% url 'ics_view' camp_slug=camp.slug %}{{ get_string }}" class="btn btn-default form-control filter-control">
+                <a id="ics-button" class="btn btn-default form-control filter-control">
                     <i class="fa fa-calendar"></i> ICS
                 </a>
             </div>

src/program/templates/schedule_overview.html

@@ -14,6 +14,7 @@
 init(
     { 'schedule_timeslot_length_minutes': Number('{{ schedule_timeslot_length_minutes }}')
     , 'schedule_midnight_offset_hours': Number('{{ schedule_midnight_offset_hours }}')
+    , 'ics_button_href': "{% url 'ics_view' camp_slug=camp.slug %}"
     }
 );
 </script>