diff --git a/app/assets/javascripts/app/controllers/widget/online_notification.js.coffee b/app/assets/javascripts/app/controllers/widget/online_notification.js.coffee
index f3a0689eb..a998599f5 100644
--- a/app/assets/javascripts/app/controllers/widget/online_notification.js.coffee
+++ b/app/assets/javascripts/app/controllers/widget/online_notification.js.coffee
@@ -43,10 +43,18 @@ class App.OnlineNotificationWidget extends App.Controller
     else
       @el.find('.logo').append('<div class="activity-counter">' + count.toString() + '</div>')
 
-  markAllAsSeen: (items) =>
-    for item in items
-      if !item.seen
-        App.OnlineNotification.seen( 'Ticket', item.id )
+  markAllAsSeen: () =>
+    @ajax(
+      id:   'markAllAsSeen'
+      type: 'POST'
+      url:  @apiPath + '/online_notifications/markAllAsSeen'
+      data: JSON.stringify( '' )
+      processData: true
+      success: (data, status, xhr) =>
+        if data.result is 'ok'
+        else
+      fail: =>
+    )
 
   stop: =>
     @counterUpdate(0)
@@ -81,7 +89,7 @@ class App.OnlineNotificationWidget extends App.Controller
       # show frontend times
       $('#markAllAsSeen').bind('click', (e) =>
         e.preventDefault()
-        @markAllAsSeen(items)
+        @markAllAsSeen()
       );
       @frontendTimeUpdate()
     ).on('hide.bs.popover', =>
diff --git a/app/controllers/online_notifications_controller.rb b/app/controllers/online_notifications_controller.rb
index 20a60efb1..4ee59f38c 100644
--- a/app/controllers/online_notifications_controller.rb
+++ b/app/controllers/online_notifications_controller.rb
@@ -88,4 +88,12 @@ curl http://localhost/api/v1/online_notifications -v -u #{login}:#{password} -H
     model_update_render(OnlineNotification, params)
   end
 
+  def markAllAsSeen
+      notifications = OnlineNotification.list(current_user,100)
+      notifications.each do |notification|
+        OnlineNotification.seen({:id => notification['id']})
+      end
+      render :json => {data:'all cool'}
+  end
+
 end
diff --git a/app/models/online_notification.rb b/app/models/online_notification.rb
index dadbf5588..0b4112d31 100644
--- a/app/models/online_notification.rb
+++ b/app/models/online_notification.rb
@@ -47,23 +47,20 @@ add a new online notification for this user
 
 =begin
 
-add a new online notification for this user
+mark online notification as seen
 
-  OnlineNotification.add(
-    :type             => 'Assigned to you',
-    :object           => 'Ticket',
-    :o_id             => ticket.id,
-    :seen             => 1,
-    :created_by_id    => 1,
-    :user_id          => 2,
+  OnlineNotification.seen(
+    :id          => 2,
+    :user        => UserObject, #optional, if passed all 
+                       #notfications for the given user are marked as seen
   )
 
 =end
 
   def self.seen(data)
-    notification = OnlineNotification.find(data[:id])
-    notification.seen = true
-    notification.save
+      notification = OnlineNotification.find(data[:id])
+      notification.seen = true
+      notification.save
   end
 
 =begin
@@ -86,7 +83,7 @@ remove whole online notifications of an object
 
 return all online notifications of an user
 
-  notifications = OnlineNotification.list( user )
+  notifications = OnlineNotification.list( user, limit )
 
 =end
 
diff --git a/config/routes/online_notification.rb b/config/routes/online_notification.rb
index 5ecfe3303..66ec56527 100644
--- a/config/routes/online_notification.rb
+++ b/config/routes/online_notification.rb
@@ -2,7 +2,8 @@ Zammad::Application.routes.draw do
   api_path = Rails.configuration.api_path
 
   # groups
-  match api_path + '/online_notifications',             :to => 'online_notifications#index',  :via => :get
-  match api_path + '/online_notifications/:id',         :to => 'online_notifications#update', :via => :put
+  match api_path + '/online_notifications',                   :to => 'online_notifications#index',         :via => :get
+  match api_path + '/online_notifications/:id',               :to => 'online_notifications#update',        :via => :put
+  match api_path + '/online_notifications/markAllAsSeen',     :to => 'online_notifications#markAllAsSeen', :via => :post
 
 end
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