Fixes #216

Button group that allows selecting the current grouping now shows
visually the selected grouping.

app/helpers/proposals_dashboard_helper.rb

@@ -75,4 +75,19 @@ module ProposalsDashboardHelper
 
     label.join(" #{t('proposals_dashboard.resource.and')}<br>")
   end
+
+  def daily_selected_class
+    return nil if params[:group_by].blank?
+    'hollow'
+  end
+
+  def weekly_selected_class
+    return nil if params[:group_by] == 'week'
+    'hollow'
+  end
+
+  def monthly_selected_class
+    return nil if params[:group_by] == 'month'
+    'hollow'
+  end
 end

app/views/proposals_dashboard/progress.html.erb

@@ -3,9 +3,15 @@
 <div class="row">
   <div class="small-12 column">
     <div class="button-group">
-      <%= link_to t('.group_by_date'), progress_proposal_dashboard_index_path(proposal), class: 'button' %>
+      <%= link_to t('.group_by_date'), 
-      <%= link_to t('.group_by_week'), progress_proposal_dashboard_index_path(proposal, group_by: 'week'), class: 'button' %>
+                  progress_proposal_dashboard_index_path(proposal), 
-      <%= link_to t('.group_by_month'), progress_proposal_dashboard_index_path(proposal, group_by: 'month'), class: 'button' %>
+                  class: "button #{daily_selected_class}" %>
+      <%= link_to t('.group_by_week'), 
+                  progress_proposal_dashboard_index_path(proposal, group_by: 'week'), 
+                  class: "button #{weekly_selected_class}" %>
+      <%= link_to t('.group_by_month'),
+                  progress_proposal_dashboard_index_path(proposal, group_by: 'month'),
+                  class: "button #{monthly_selected_class}" %>
     </div>
   </div>
 </div>