Added client side javascript for tracking

1 files changed, 26 insertions, 0 deletions

diff --git a/track.js b/track.js
new file mode 100644
index 0000000..cb8ab72
--- /dev/null
+++ b/track.js
@@ -0,0 +1,26 @@
+(()=>{
+	let startedAt = null
+	let scrolledTo = null
+	window.addEventListener("load", ()=>{
+		startedAt = new Date()
+		scrolledTo = window.scrollY
+		if (window.innerHeight > document.scrollingElement.scrollHeight) {
+			scrolledTo = document.scrollingElement.scrollHeight
+		}
+	})
+	window.addEventListener("scroll", (event)=>{
+		scrolledTo = Math.max(scrolledTo, window.scrollY + window.innerHeight)
+	}, false)
+	window.addEventListener("beforeunload", ()=>{
+		let xhr = new XMLHttpRequest()
+		xhr.open("POST", "https://stats.ignore.pl/entry")
+		xhr.setRequestHeader("Content-Type", "application/json")
+		xhr.send(JSON.stringify({
+			"location": document.location.href,
+			"referrer": document.referrer,
+			"startedAt": startedAt,
+			"timeSpent": Math.floor((new Date() - startedAt) / 1000),
+			"scrolledTo": scrolledTo / document.scrollingElement.scrollHeight
+		}))
+	})
+})()