Time Activity

activity.js

// Script for track user activity in page and out the page
var timeActiveOnSite = 0; // seconds
var timeInactive = 0;    // seconds
var lastActivityDatetime;
window.setInterval(function(){
  if(document['visibilityState'] === 'visible'){
    timeActiveOnSite++;
    lastActivityDatetime = Date.now();
  } else {
    timeInactive++;
    var timeDiff = Date.now() + (timeInactive * 1000)
    if( (timeDiff - Date.now()) > 10*1000 ) { // 10 seconds inactity invokes alert
      alert('User is inactive, clear session data!');
    } 
}
},1000);

console.log('Last Activity Date time', lastActivityDatetime);
console.log('Seconds spended on site', timeActiveOnSite);
console.log('Seconds out the site', timeActiveOnSite);