Breaking News: Grepper is joining You.com. Read the official announcement!

js intersection observer

Add Answer

Don't touch answered on August 29, 2021 Popularity 9/10 Helpfulness 3/10

answer js intersection observer

related intersection observer javascript

related js intersection observer

related intersection observer

related intersection Observer

js intersection observer

Comment

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 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: intersection-observer javascript

Link to this answer
Share Copy Link

Contributed on Jul 26 2023

Don't touch

0 Answers Avg Quality 2/10

Closely Related Answers

intersection observer javascript

Comment

//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 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: intersection-observer intersection

Link to this answer
Share Copy Link

Contributed on Dec 16 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

js intersection observer

Comment

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 intersection

Link to this answer
Share Copy Link

Contributed on Aug 09 2023

Mark Smith

0 Answers Avg Quality 2/10

intersection observer

Comment

-1

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 10/10 Helpfulness 2/10 Language javascript

Source: www.w3.org

Tags: intersection-observer intersection

Link to this answer
Share Copy Link

Contributed on Sep 30 2022

Robert Misener

0 Answers Avg Quality 2/10

intersection Observer

Comment

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

Link to this answer
Share Copy Link

Contributed on Aug 29 2021

Ahmed Elfaham

0 Answers Avg Quality 2/10

js intersection observer

Contents

More Related Answers

js intersection observer

Closely Related Answers

intersection observer javascript

js intersection observer

intersection observer

intersection Observer

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.