What are the steps to start using the Intersection Observer API right away?

Question

What are the steps to start using the Intersection Observer API right away?

Utilizing the Intersection Observer API, I can accurately determine whether an element is within the viewport or not.

Is there a way to utilize the Intersection Observer API to detect if an element is in the viewport without relying on a callback function?

For example:

 let options = {
   root: ..
   rootMargin: '0px',
   threshold: 1.0
  }

  let observer = new IntersectionObserver(callback, options);

  const status = observer.isInViewport(); // <------- this is my desired functionality or something similar, no callback required.

javascript vue.js

Answer 1

Answer №1

It's advantageous to utilize the mounted lifecycle hook when working with refs, such as in the onMounted function within the composition API. Your callback code can be found here:

    const ready = ref(false);
    const myRef = ref(null);

   onMounted(() => {
  const vm = getCurrentInstance();
  let options = {
   root: vm.$refs.myRef,
   rootMargin: '0px',
   threshold: 1.0
  }

   let observer = new IntersectionObserver(([entry]) => {
      if (entry && entry.isIntersecting) {
        ready.value = true;
      }
    }, options);
     observer.observe(myRef.value)
 })

  return { ready, myRef }

Answer 2

It's advantageous to utilize the mounted lifecycle hook when working with refs, such as in the onMounted function within the composition API. Your callback code can be found here:

    const ready = ref(false);
    const myRef = ref(null);

   onMounted(() => {
  const vm = getCurrentInstance();
  let options = {
   root: vm.$refs.myRef,
   rootMargin: '0px',
   threshold: 1.0
  }

   let observer = new IntersectionObserver(([entry]) => {
      if (entry && entry.isIntersecting) {
        ready.value = true;
      }
    }, options);
     observer.observe(myRef.value)
 })

  return { ready, myRef }

What are the steps to start using the Intersection Observer API right away?

Answer №1

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