State counting updates with subgroup

app/assets/javascripts/activities.coffee

 @filterparticipants = (e) ->
   show = e.target.value
   if (show != 'all')
-	  selector = "[data-subgroup-id=" + e.target.value + "]"
-	  $('.participant-row').hide()
-	  $(selector).show()
+    selector = "[data-subgroup-id=" + e.target.value + "]"
+    $('.participant-row').hide()
+    $(selector).show()
+    @updatecounts(show)
   else
     $('.participant-row').show()
+    @updatecounts()
 
 @updatecounts = (subgroupid) ->
-  selector = 'tr.participant-row'
+  selector = 'tr.countable.participant-row'
+  selectorend = '[style!="display: none;"]'
+
   if (subgroupid)
-    selector = 'tr.participant-row[data-subgroup-id=' + subgroupid + ']'
+    selectorend = '[data-subgroup-id=' + subgroupid + ']' + selectorend
+
+  pselect = selector + '.success' + selectorend
+  uselect = selector + '.warning' + selectorend
+  aselect = selector + '.danger' + selectorend
+
+  numall = $(selector + selectorend).length
+  numpresent = $(pselect).length
+  numunknown = $(uselect).length
+  numabsent  = $(aselect).length
+
+  $('.state-count.all-count').html(numall)
+  $('.state-count.present-count').html(numpresent)
+  $('.state-count.unknown-count').html(numunknown)
+  $('.state-count.absent-count').html(numabsent)
+  [numpresent, numabsent, numunknown]

app/views/activities/_state_counts.html.haml

 (
 %span.state-count.present-count
   = counts[true] or 0
-  P
-,
+P,
 %span.state-count.unknown-count
   = counts[nil] or 0
-  ?
-,
+?,
 %span.state-count.absent-count
   = counts[false] or 0
-  A
-)
+A)

app/views/activities/show.html.haml

   .row
     .col-md-6
       %h2
-        = @num_participants
+        %span.state-count.all-count
+          = @num_participants
         = t 'activities.participant.plural'
         = render partial: "state_counts", locals: {counts: @counts}
     .col-md-6
 
   %table.table.table-bordered
     - @participants.each do |p|
-      %tr.participant-row{class: p.row_class, data: {person_id: p.person.id, activity_id: @activity.id, subgroup_id: p.subgroup_id}}
+      %tr.participant-row.countable{class: p.row_class, data: {person_id: p.person.id, activity_id: @activity.id, subgroup_id: p.subgroup_id}}
         %td
           = p.person.full_name
           - if p.is_organizer
           %i.fa.fa-angle-up
 
         = t 'activities.state.present'
-        %span.badge
+        %span.badge.state-count.present-count
           = @counts[true] || "0"
 
     %table.table.collapse#present-collapse
 
         = t 'activities.state.need_response'
 
-        %span.badge
+        %span.badge.state-count.unknown-count
           = @counts[nil] || "0"
 
     %table.table.collapse#unknown-collapse
 
         = t 'activities.state.absent'
 
-        %span.badge
+        %span.badge.state-count.absent-count
           = @counts[false] || "0"
 
     %table.table.collapse#absent-collapse