Issues arising with Intersection Observer in vue.js

Recently, I started using IntersectionObserver for the first time and I found a helpful guide at . However, I encountered an error that is causing me some trouble.

[Vue warn]: Error in mounted hook: "TypeError: Failed to construct 'IntersectionObserver': The provided value is not of type '(Element or Document)'"

Here is the code snippet of my trigger component:

<template>
  <span ref='trigger'></span>
</template>

<script>
export default {
  props:{
    options:{
      type: Object,
      default: () => ({
        root: 0,
        threshold: "0",
      })
    }
  },
  data(){
    return{
      observer : null
    }
  },
  mounted(){
    this.observer = new IntersectionObserver( entries => {
      this.handleIntersect(entries[0]);
    }, this.options);

    this.observer.observe(this.$refs.trigger);
  },
  destroyed(){
    this.observer.disconnect();
  },
  methods:{
    handleIntersect(entry){
      if (entry.isIntersecting) this.$emit("triggerIntersected");
    }
  }
}
</script>

I would appreciate any help on fixing this issue. Thank you!

Answer №1

The options default has been modified as follows:

default: () => ({
  root: 0,
  threshold: "0"
})

However, if we refer to the lib.dom.d.ts file, we can see the IntersectionObserver options object interface:

interface IntersectionObserverInit {
  root?: Element | null;
  rootMargin?: string;
  threshold?: number | number[];
}

When root is null or undefined, the IntersectionObserver defaults to the viewport element.

It is recommended to revert root back to null for proper functionality.

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