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js intersection observer

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Mark Smith answered on August 29, 2021 Popularity 9/10 Helpfulness 3/10

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function logIntersectionRatio(rootSelector, targetSelector) {
    
    // get the elements
    var root = document.querySelector(rootSelector);
    var target = document.querySelector(targetSelector);
    
    // callback for initializing the observer
    function callback (entries, observer) {
        entries.forEach(function (entry) {
            console.log(entry.intersectionRatio);
            // do stuff
        });
    }

    // options for initializing the observer
    var options = { root: root };

    // initialize
    var observer = new IntersectionObserver(callback, options);

    // observe
    observer.observe(target);
    
}

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: intersection-observer javascript

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Contributed on Aug 09 2023

Mark Smith

0 Answers Avg Quality 2/10

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//selection of element
const slide = document.querySelector('.slide');

const observer = new IntersectionObserver(
  //callback function which get entries and observer as parameter in callback function
  function (entries) {
    entries.forEach(entry => {
      if (entry.isIntersecting) {
        slide.style.background = 'red';
      }
    });
  },
  //options object which can take  root?: Element | Document | null; rootMargin?: string;
  //threshold ?: number | number[];
  { threshold: 0.9 }
);

//observe
observer.observe(slide);

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: intersection-observer intersection

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Contributed on Dec 16 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

js intersection observer

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The Intersection Observer API provides a way to asynchronously observe changes
in the intersection of a target element with an ancestor element or with a 
top-level document's viewport.

const Observer = new IntersectionObserver(
   (items, observer) => {
      items.forEach((item, i) => {
         const element = item.target
         if (item.isIntersecting) { // console.log(item)

            console.log(element); // desire element
            
            observer.unobserve(target); // unobserve element
         }
      })
   },
   { threshold: .5 } // if half of the element is visible on the viewport.
);

const items = document.querySelectorAll(".items");
items.forEach((item) => {
   Observer.observe(item);
});

Popularity 8/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: intersection-observer intersection

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Contributed on Jul 26 2023

Don't touch

0 Answers Avg Quality 2/10

intersection observer

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var observer = new IntersectionObserver(changes => {
  for (const change of changes) {
    console.log(change.time);               // Timestamp when the change occurred
    console.log(change.rootBounds);         // Unclipped area of root
    console.log(change.boundingClientRect); // target.getBoundingClientRect()
    console.log(change.intersectionRect);   // boundingClientRect, clipped by its containing block ancestors, and intersected with rootBounds
    console.log(change.intersectionRatio);  // Ratio of intersectionRect area to boundingClientRect area
    console.log(change.target);             // the Element target
  }
}, {});

// Watch for intersection events on a specific target Element.
observer.observe(target);

// Stop watching for intersection events on a specific target Element.
observer.unobserve(target);

// Stop observing threshold events on all target elements.
observer.disconnect();

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: www.w3.org

Tags: intersection-observer intersection

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Contributed on Sep 30 2022

Robert Misener

0 Answers Avg Quality 2/10

intersection Observer

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const numSteps = 20.0;

let boxElement;
let prevRatio = 0.0;
let increasingColor = "rgba(40, 40, 190, ratio)";
let decreasingColor = "rgba(190, 40, 40, ratio)";

// Set things up
window.addEventListener("load", (event) => {
  boxElement = document.querySelector("#box");

  createObserver();
}, false);

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: developer.mozilla.org

Tags: intersection-observer intersection

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Contributed on Aug 29 2021

Ahmed Elfaham

0 Answers Avg Quality 2/10

js intersection observer

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