track pageloads with google analytics. fixes #1012 (#1048)

* track pageloads with google analytics. fixes #1012

* Update Router.js

frontend/src/Metamaps/Router.js

@@ -39,7 +39,7 @@ const _Router = Backbone.Router.extend({
 
     var navigate = function() {
       self.timeoutId = setTimeout(function() {
-        self.navigate('')
+        self.navigateAndTrack('')
       }, 300)
     }
 
@@ -121,7 +121,7 @@ const _Router = Backbone.Router.extend({
         path += '/' + DataModel.Maps.Mapper.mapperId
       }
 
-      self.navigate(path)
+      self.navigateAndTrack(path)
     }
     var navigateTimeout = function() {
       self.timeoutId = setTimeout(navigate, 300)
@@ -202,6 +202,11 @@ const _Router = Backbone.Router.extend({
 
 const Router = new _Router()
 
+Router.navigateAndTrack = (fragment, options) => {
+  Router.navigate(fragment, options)
+  window.ga && window.ga('send', 'pageview', location.pathname, {title: document.title})
+}
+
 Router.intercept = function(evt) {
   var segments
 

frontend/src/Metamaps/Visualize.js

@@ -206,9 +206,9 @@ const Visualize = {
       var t = Active.Topic
 
       if (m && window.location.pathname !== '/maps/' + m.id) {
-        Router.navigate('/maps/' + m.id)
+        Router.navigateAndTrack('/maps/' + m.id)
       } else if (t && window.location.pathname !== '/topics/' + t.id) {
-        Router.navigate('/topics/' + t.id)
+        Router.navigateAndTrack('/topics/' + t.id)
       }
     }, 800)
   },