Upgrade segment.io to match documentation.

May improve performance.
TNL-3538

cms/templates/base.html

@@ -96,6 +96,7 @@ import json
           });
       });
     </script>
+    <%include file="widgets/segment-io-footer.html" />
     <div class="modal-cover"></div>
   </body>
 </html>

cms/templates/widgets/segment-io-footer.html

+% if settings.CMS_SEGMENT_KEY:
+    <!-- begin segment footer -->
+    <script type="text/javascript">
+    % if user.is_authenticated():
+        // We can't use JQuery's on load method because it
+        // screws up RequireJS' JQuery initialization.
+        var onLoadCallback = function() {
+            analytics.identify("${user.id}", {
+              email: "${user.email}",
+              username: "${user.username}"
+            });
+        };
+        if (window.addEventListener) {
+            window.addEventListener("load", onLoadCallback, false);
+        }
+        else {
+            onLoadCallback();
+        }
+    % endif
+    </script>
+    <!-- end segment footer -->
+% endif

cms/templates/widgets/segment-io.html

@@ -14,16 +14,12 @@
       var course_location_analytics = "${locator | escapejs}";
   %endif
 
-  var analytics=analytics||[];analytics.load=function(e){var t=document.createElement("script");t.type="text/javascript",t.async=!0,t.src=("https:"===document.location.protocol?"https://":"http://")+"d2dq2ahtl5zl1z.cloudfront.net/analytics.js/v1/"+e+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(t,n);var r=function(e){return function(){analytics.push([e].concat(Array.prototype.slice.call(arguments,0)))}},i=["identify","track","trackLink","trackForm","trackClick","trackSubmit","pageview","ab","alias","ready"];for(var s=0;s<i.length;s++)analytics[i[s]]=r(i[s])};
+  // Asynchronously load Segment's analytics.js library
+  !function(){var analytics=window.analytics=window.analytics||[];if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Segment snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","page","once","off","on"];analytics.factory=function(t){return function(){var e=Array.prototype.slice.call(arguments);e.unshift(t);analytics.push(e);return analytics}};for(var t=0;t<analytics.methods.length;t++){var e=analytics.methods[t];analytics[e]=analytics.factory(e)}analytics.load=function(t){var e=document.createElement("script");e.type="text/javascript";e.async=!0;e.src=("https:"===document.location.protocol?"https://":"http://")+"cdn.segment.com/analytics.js/v1/"+t+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(e,n)};analytics.SNIPPET_VERSION="3.1.0";
   analytics.load("${ settings.CMS_SEGMENT_KEY }");
-
-  % if user.is_authenticated():
-  analytics.identify("${ user.id }", {
-      email     : "${ user.email }",
-      username  : "${ user.username }"
-  });
-
-  % endif
+  analytics.page();
+  }}();
+  // Note: user tracking moved to segment-io-footer.html
 </script>
 <!-- end Segment -->
 % else:

lms/templates/footer-edx-v3.html

@@ -70,6 +70,7 @@
   <%static:js group='base_vendor'/>
   <%static:css group='style-vendor'/>
   <%include file="widgets/segment-io.html" />
+  <%include file="widgets/segment-io-footer.html" />
 % endif
 % if footer_css_urls:
   % for url in footer_css_urls:

lms/templates/footer.html

@@ -75,6 +75,7 @@
   <%static:js group='base_vendor'/>
   <%static:css group='style-vendor'/>
   <%include file="widgets/segment-io.html" />
+  <%include file="widgets/segment-io-footer.html" />
 % endif
 % if footer_css_urls:
   % for url in footer_css_urls:

lms/templates/main.html

@@ -159,6 +159,7 @@ from branding import api as branding_api
 % endif
 
   <%block name="js_extra"/>
+  <%include file="widgets/segment-io-footer.html" />
   <script type="text/javascript" src="${static.url('js/vendor/noreferrer.js')}" charset="utf-8"></script>
   <script type="text/javascript" src="${static.url('js/utils/navigation.js')}" charset="utf-8"></script>
 </body>

lms/templates/widgets/segment-io-footer.html

+% if settings.LMS_SEGMENT_KEY:
+    <!-- begin segment footer -->
+    <script type="text/javascript">
+    % if user.is_authenticated():
+        $(window).load(function() {
+            analytics.identify("${user.id}", {
+              email: "${user.email}",
+              username: "${user.username}"
+            });
+        });
+    % endif
+    </script>
+    <!-- end segment footer -->
+% endif

lms/templates/widgets/segment-io.html

@@ -2,16 +2,11 @@
 <!-- begin Segment -->
 <script type="text/javascript">
   // Asynchronously load Segment's analytics.js library
-  window.analytics||(window.analytics=[]),window.analytics.methods=["identify","track","trackLink","trackForm","trackClick","trackSubmit","page","pageview","ab","alias","ready","group","on","once","off"],window.analytics.factory=function(t){return function(){var a=Array.prototype.slice.call(arguments);return a.unshift(t),window.analytics.push(a),window.analytics}};for(var i=0;i<window.analytics.methods.length;i++){var method=window.analytics.methods[i];window.analytics[method]=window.analytics.factory(method)}window.analytics.load=function(t){var a=document.createElement("script");a.type="text/javascript",a.async=!0,a.src=("https:"===document.location.protocol?"https://":"http://")+"d2dq2ahtl5zl1z.cloudfront.net/analytics.js/v1/"+t+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(a,n)},window.analytics.SNIPPET_VERSION="2.0.8",
+  !function(){var analytics=window.analytics=window.analytics||[];if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Segment snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","page","once","off","on"];analytics.factory=function(t){return function(){var e=Array.prototype.slice.call(arguments);e.unshift(t);analytics.push(e);return analytics}};for(var t=0;t<analytics.methods.length;t++){var e=analytics.methods[t];analytics[e]=analytics.factory(e)}analytics.load=function(t){var e=document.createElement("script");e.type="text/javascript";e.async=!0;e.src=("https:"===document.location.protocol?"https://":"http://")+"cdn.segment.com/analytics.js/v1/"+t+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(e,n)};analytics.SNIPPET_VERSION="3.1.0";
   analytics.load("${ settings.LMS_SEGMENT_KEY }");
   analytics.page();
-
-  % if user.is_authenticated():
-    analytics.identify("${user.id}", {
-      email: "${user.email}",
-      username: "${user.username}"
-    });
-  % endif
+  }}();
+  // Note: user tracking moved to segment-io-footer.html
 </script>
 <!-- end Segment -->
 % else: