Added Visibility Change

JavaScript Files/Visibility Change.js

@@ -0,0 +1,39 @@
+//Check Visibility Change
+
+Qualtrics.SurveyEngine.addOnReady(function () {
+    time_off = 0;
+    time_fs = 0;
+	document.addEventListener("visibilitychange", function () {
+		if (document.visibilityState != "visible") {
+			Qualtrics.SurveyEngine.setEmbeddedData("tab_changed", "true");
+			off_screen = setInterval(() => {
+				time_off++;
+				console.log(time_off);
+			}, 100);
+		}else{
+				clearInterval(off_screen);
+				console.log(time_off);
+		}
+	});
+	document.addEventListener("fullscreenchange", function () {
+		if (document.fullscreenElement !== null) {
+			full_screen = setInterval(() => {
+				time_fs++;
+				console.log(time_fs);
+			}, 100);
+		} else {
+            clearInterval(full_screen);
+			console.log(time_fs);
+			console.log("fs disabled");
+		}
+	});
+	document.querySelector("#NextButton").onclick = function () {
+        clearInterval(off_screen);
+        clearInterval(full_screen);
+		Qualtrics.SurveyEngine.setEmbeddedData("gone_for", time_off);
+        Qualtrics.SurveyEngine.setEmbeddedData("full_screen", time_fs);
+        console.log(time_fs);
+        console.log(time_off);
+
+	};
+});