How to get check if a page gets reloaded with js

Question

How do you now check if a page gets reloaded?

It used to be like this:

//check for Navigation Timing API support
if (window.performance) {
  console.info("window.performance works fine on this browser");
}
console.info(performance.navigation.type);
if (performance.navigation.type == performance.navigation.TYPE_RELOAD) {
  console.info( "This page is reloaded" );
} else {
  console.info( "This page is not reloaded");
}

But now I found out that navigation type is deprecated: https://developer.mozilla.org/en-US/docs/Web/API/Performance/navigation

So then I checked the replacement: https://developer.mozilla.org/en-US/docs/Web/API/PerformanceNavigationTiming

Even after reading it it's still not very clear on how I could accomplish this. So how does the new way work of checking if a page gets refreshed?

I also tried this after I had read it:

    if (PerformanceNavigationTiming.type == "reload") {
    alert('page reloaded')
    }

But then the alert won't be displayed.

And after that I tried this:

    if (PerformanceNavigationTiming.type == PerformanceNavigationTiming.TYPE_RELOAD) {
    alert('page reloaded')
    }
    

But then It would display the alert also without a page refresh.

Then the last thing I tried:

  const pageAccessedByReload = (
      (PerformanceNavigationTiming && PerformanceNavigationTiming.TYPE === 1) ||
        window.performance
          .getEntriesByType('navigation')
          .map((nav) => nav.type)
          .includes('reload')
    );
    
    alert(pageAccessedByReload);

But this also gives me an alert either false when it's not reloaded and true when it is reloaded. And I only want that alert when the page is reloaded.

Answer 1

You must remember to always pay attention when reading a new API docs, type in PerformanceNavigationTiming is a string and not a number so the correct way would be:

if (window.PerformanceNavigationTiming) {
  console.info("window.performance works fine on this browser");
  
  if (PerformanceNavigationTiming.type === "reload") {
    console.info("This page is reloaded");
  } else {
    console.info("This page is not reloaded");
  }
}