如何测量 Div 上的查看时间？

Question

I am looking for to calculate how much time a visitor read my post using JavaScript. Like I have

3 div. each div contains information when visitor read any div I will calculate the time. it will not work when somebody scroll down not staying on the div. User must stay on the div. Each particular div will generate its own reading time. Actually I did not implement any code. Looking for a better solution. Thank you

Answer 1

You can use some web analytics services like google analytics or hotjar that provide a good services.

If you want to do something custom that match exactly you use case

I'd suggest using IntersectionObserver API

const onIntersection = (entries) => {
  for (const entry of entries) {
    if (entry.isIntersecting) {
      console.log(entry);
    }
  }
};

const observer = new IntersectionObserver(onIntersection);
observer.observe(document.querySelector('#div1'));

This will tell you when the viewport is on the selected element #div1 in this case (When the user is seeing the div). So you can run a timer and check how long the user has been viewing the element.

Useful links: https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API/Timing_element_visibility https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API