watch for back button page loads

browser-back-button-fire-js.js

/*
https://stackoverflow.com/questions/37838430/detect-if-page-is-load-from-back-button#answer-53317159
*/

/* CHROME */
if (window.performance) {
     var navEntries = window.performance.getEntriesByType('navigation');
     if (navEntries.length > 0 && navEntries[0].type === 'back_forward') {
          console.log('As per API lv2, this page is load from back/forward');
     } else if (window.performance.navigation
          && window.performance.navigation.type == window.performance.navigation.TYPE_BACK_FORWARD) {
          console.log('As per API lv1, this page is load from back/forward');
     } else {
          console.log('This is normal page load');
     }
} else {
     console.log("Unfortunately, your browser doesn't support this API");
}

/* EVERYTHING ELSE */
window.addEventListener('pageshow', function (event) {
    console.log('Everything has loaded');
});