如何检查页面是否使用js重新加载

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"); } }

Answer 2

I have finally found a solution:

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

Now it will only show when the page is refreshed.