Pageview times experiment (#69)

* experiment: track pageview times

* strictly respect do not track

* oops

* asdfasdfasdf

* add blogpost

* fix typos oops

1 files changed, 31 insertions, 0 deletions

diff --git a/static/js/pageview_timer.js b/static/js/pageview_timer.js
new file mode 100644
index 0000000..2761396
--- /dev/null
+++ b/static/js/pageview_timer.js
@@ -0,0 +1,31 @@
+/*
+  Hi,
+
+  If you are reading this, you have found this script in the referenced scripts
+  for pages on this site. I know you're gonna have to take me at my word on this,
+  but I'm literally using this to collect how much time people spend reading my
+  webpages. See metrics here: https://christine.website/metrics
+
+  If you have the "do not track" setting enabled in your browser, this code will
+  be ineffectual.
+*/
+
+(function() {
+    let dnt = navigator.doNotTrack;
+    if (dnt === "1") {
+        return;
+    }
+
+    let startTime = new Date();
+
+    function logTime() {
+        let stopTime = new Date();
+        window.navigator.sendBeacon("/api/pageview-timer", JSON.stringify({
+            "path": window.location.pathname,
+            "start_time": startTime.toISOString(),
+            "end_time": stopTime.toISOString()
+        }));
+    }
+
+    window.addEventListener("pagehide", logTime, false);
+})();