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Intersection observer api


intersection observer api Lets say you are on section 1 and you click the last section, 5, and it scrolls the page down past all the other sections in-between. Intersection Observer. you can see the element on screen). Creating an intersection observer instance is easy, we just need to create a new instance of IntersectionObserver and call the observe method, passing a DOM element: Nov 08, 2021 · The Intersection Observer API was created as a solution to solve the issues associated with "scroll events". By default, this is the browser Jul 08, 2020 · The primary interface for the Intersection Observer API. , which Intersection Observer API. The top use cases for the intersection observer are: Sticky navigation bars; Live table of contents; Some scrolling effects May 22, 2021 · The Intersection Observer API is simply a new way to observe (monitor) the position and visibility of an element in the DOM relative to another root element and to run a callback function if these elements intersect (meet). The Intersection Observer API provides a way to monitor asynchronous changes in a target element’s intersection with a predecessor element or a top-level document viewport. Its usage is very simple. To lazy load our images, we have to define Feb 15, 2021 · Mozilla web documentation describes the intersection observer API as:. An optional object which customizes the observer. May 21, 2021 · The Intersection Observer API is simply a new way to observe (monitor) the position and visibility of an element in the DOM relative to another root element and to run a callback function if these elements intersect (meet). Deploy the sentinels. Some apps contain several images that are not visible from the beginning. It has good support across modern web browsers and there is a polyfill for browsers that don’t support it. Feb 29, 2020 · The Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element… developer. options Optional. This new API not only lets you see when a target element intersects with an ancestor’s viewport, but also has a wide array of options to customize it. This is usually an expensive task to accomplish and can make pages noticeably slower as a result of trying to compute the position of elements on the page. Sep 05, 2018 · The Intersection Observer API is a browser API which can be used to track the position of HTML elements in context to the actual viewport of the browser. Install. But what is it needed for? Jul 18, 2020 · The Intersection Observer API provides a way to observe asynchronously observing changes in the interface with ancestor elements or with top-level document’s viewport. org Using the Effect Hook - React Using Intersection Observer makes it less resource intensive and a lot easier to implement compared to listening for scroll events and checking if an element is about to enter the viewport. It used to be that figuring out whether an element was present within the viewport was a heavy and imprecise operation. Apr 13, 2020 · This is a JavaScript library that provides 2 directives and 1 service for declarative use of Intersection Observer API with Angular. Sep 28, 2021 · Cómo usar Intersection Observer API en Next. It observes changes constantly without needing to register events. As always, MDN’s article on the subject is invaluable. This means that they’ll share similar API structures, and in general, allow you to observe and react to certain changes and values. The Intersection Observer API is not currently available on the RapidAPI marketplace. It will be called once the API has finished loading. The game changer here is that it's delivered asynchronously, making it really useful for understanding the visibility of elements, so we can implement the pre-loading and deferred loading of our DOM content. Tomorrow, we’ll get into some of Jul 10, 2019 · The Intersection Observer API is a perfect fit for this use-case. These last years browsers vendors have paid more attention to the riddles developers were trying to solve to implement native and more performant solutions, and this one was a high on the list. A threshold is a number between 0 and 1 that represents how much percent of the target element is intersected by the root. This API allows for a variety of different use-cases that can help with creating more efficient and more performant applications. I have defined the options like this: Jul 18, 2020 · The Intersection Observer API provides a way to observe asynchronously observing changes in the interface with ancestor elements or with top-level document’s viewport. When an IntersectionObserver is created, it's configured to watch for given ratios of visibility within the root. Agent Smith: we have no choice but to continue as planned. This thread is archived. Intersection Observer API The API’s goal was to make it easier and more efficient to detect the visibility of elements on the page in relation to the viewport. Published: 2016. It’s far more performant than using a scroll event listener with the Element. — -MDN. share. React Intersection List builds on top of React Intersection Observer, using a sentinel in the DOM to deliver a high-performance and smooth scrolling experience, even on low-end devices. See full list on medium. (viewport: is a frame, maybe a polygonal area (usually a rectangle) on the screen that you are seen in. Feb 25, 2018 · The Intersection Observer API is a Web platform API that allows for observing changes to how much of a target element’s area intersects with that of an ancestor element or the viewport. js ran into a great problem to use the Intersection Observer web API. ‚ÄúThe Intersection Observer API provides a way to synchronously observe changes in the intersection of a target element with an May 11, 2021 · I have created a hook called use-visibility-detector to tap into the Intersection Observer API. In short, an Intersection Observer provides a way to observe any element on the page and do something when it’s partially displayed, completely displayed, or Mar 29, 2021 · Intersection Observer API Posted on March 29, 2021 April 19, 2021 by Greg Scharf If you need to programmatically determine when an HTML element is on or off screen, for example if you want to stick your header or menu to the top of the site as it’s about to scroll off, there is now a much easier and more reliable way to do that with the Intersection Observer API for Angular Part of Web APIs for Angular The Intersection Observer API provides a more straightforward and powerful method for checking element visibility relative to the viewport. Usage. The Intersection Observer API lets code register a callback function that is executed whenever an element they wish to monitor enters or exits another element (or the viewport), or when the amount by which the two intersect changes by a requested amount. Jan 23, 2021 · 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. According to MDN, 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. Intersection Observer V2. With this API, we can listen if an element is in the viewport and if they intersect with the viewport. Jun 22, 2020 · So Intersection Observer V2 was born to prevent these types of scenarios. Jun 13, 2016 · The Intersection Observer API explained. Jul 29, 2020 · So what is Intersection Observer. 5 begins observing when 50% of the element is in view, and a value of 1 is when the entire element is in view. Since the essence of visible is that the target element creates a crossover area with the viewport, so this API is called a "Intersection Observer". Intersection Observer API. Behind the scenes, the Intersection Observer API makes use of requestIdleCallback to help with performance even more. Nov 19, 2021 · The Intersection Observer API lets us add infinite scrolling easily within our React app because we can use it to detect the element at the bottom of the list. Each observer can asynchronously observe changes in the intersection between one or more target elements and a shared ancestor element or Jan 21, 2021 · The Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element (in this case, a header) with the viewport (or any other ancestor element). In this lesson we’ll create a LazyImage component that uses the Intersection Observer API in order to lazy load the image when it gets into the viewport. Apr 20, 2017 · It’s an API native to the browser, currently available in Chrome and Edge, with Firefox and Safari reportedly developing their own. For example, you could look at every element you care about every time a scroll Jul 13, 2021 · The Intersection Observer API is a JavaScript API that enables us to observe an element and detect when it passes a specified point in a scrolling container — often (but not always) the viewport — triggering a callback function. The official documentation says: "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 Apr 18, 2021 · Intersection observer API can observe whether the elements are located within or at the intersection of the viewport. For the uninitiated, xterm. Apr 27, 2020 · Intersection Observer API lets you do something in the callback function when it observes an intersection (beyond a certain threshold) between the root element and the target element. To observe when. New comments cannot be posted and Nov 18, 2021 · As the purpose of this article is infinite loading, we’re not going to go into the implementation details of the Intersection Observer API, and instead use an existing React Hook that provides that functionality for us, react-cool-inview. Make sure to run it after the component has mounted so the ref can be populated or if you are using SSR. Besides a nice sticky header, other uses for the Intersection Observer API include: Triggering animations or jobs based on element visibility. What this brand new Web API allows you to do, is checking whether you can visually see the element you are observing within your viewport or any other Hakim's Progress Nav Concept using the Intersection Observer API - hakim-s-progress-nav-concept-using-the-intersection-observer-api. The Intersection Observer API provides a more straightforward and powerful method for checking element visibility relative to the viewport. In simple terms, Intersection Observer API makes it easy to detect when an element enters the viewport and take an action when it appears. Practical, real world examples of IntersectionObserver API - IntersectionObserver API examples Mar 25, 2018 · Fortunately, a new API called the “intersection observer API” can help. The above statement summarise s its usage. Today, we’ll tackle the basics. Mar 05, 2020 · The Intersection Observer is an API that we can use to keep track of the visibility and position of DOM elements. live/blog/i 3 comments. js is an open source project that I work on which enables the creation of terminal emulators for the web. You can provide any combination of the following options: Jun 05, 2021 · The Intersection Observer API is simply a new way to observe (monitor) the position and visibility of an element in the DOM relative to another root element and to run a callback function if these elements intersect (meet). While using Intersection Observer API, the callback will be fired only when the target element comes to the viewport which prevents the javascript engine to run # Intersection Observer. Immediately. Our goal here is simple. A few key terms are used to define any instance of an Intersection Observer. The Intersection Observer API will initiate the callback once the target element becomes visible and meets other option parameters. markdown React hook that utilizes the Intersection Observer API to observe when an element enters and exits the viewport Rescript Libs ⭐ 4 a Collections and Essential set of Library, Utility, & Tools for ReScript Lang especially in Web. Thankfully, there is a polyfill that provides support for these exceptions, as well as legacy browsers. Instead of listening to browser events to manually perform calculations, we can implement the same behavior in a more efficient, maintainable way, using Intersection Observer API. API. New comments cannot be posted and Mar 25, 2018 · Fortunately, a new API called the “intersection observer API” can help. In short: Triggers a callback based on the visibility/overlapping of a dom object to its parent Mar 29, 2021 · Intersection Observer API Posted on March 29, 2021 April 19, 2021 by Greg Scharf If you need to programmatically determine when an HTML element is on or off screen, for example if you want to stick your header or menu to the top of the site as it’s about to scroll off, there is now a much easier and more reliable way to do that with the Jan 31, 2021 · The Intersection Observer API is a web API that allows developers to provide the browser with a callback function that is executed when a target element becomes visible relative to the viewport or a specified ancestor element (intersection occurs). The useIntersectionObserver function exposes the following reactive state: Intersection Observer API : Demo - UsefulAngle Target May 22, 2019 · The API is the Intersection Observer. In other words, IntersectionObserver asynchronously observes overlapping of one element by another element. save. 28/09/2021 ¡Hola! En este artículo vamos a ver cómo usar Intersection Observer API. " Feb 29, 2020 · The Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element… developer. Click "Request this API on RapidAPI" to let us know if you would like to access to this API. We assign a ref to the element at the bottom of the page, then we can use the Intersection Observer API to detect when it crosses the screen’s edge and displayed on the page. If you need Mozilla Intersection Observer API support, you can reach out to their Twitter account at @mozdevnet. May 07, 2019 · Intersection Observer API lets you do something in the callback function when it observes an intersection (beyond a certain threshold) between the root element and the target element. Oct 06, 2021 · 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. Jan 31, 2021 · The Intersection Observer API is a web API that allows developers to provide the browser with a callback function that is executed when a target element becomes visible relative to the viewport or a specified ancestor element (intersection occurs). Intersection Observer: How it should be used. Feb 19, 2021 · The Intersection Observer API lets us add infinite scrolling easily within our React app because we can use it to detect the element at the bottom of the list. report. Jan 21, 2019 · The Intersection Observer API fires a callback when the visibility of the target element crosses a specified threshold. May 11, 2019 · Does the plugin “Lazy Load by WP Rocket” use “Intersection Observer API”? And would you let me know how do I check if the API works or not. An Intersection Observer takes in a callback function and some options. Apr 27, 2016 · Quick introduction to the Intersection Observer API. May 22, 2018 · Fortunately, there is a new IntersectionObserver API that can automatically "observes" if the element is visible, as Chrome 51+ already supports. observer. livewire. While using Intersection Observer API, the callback will be fired only when the target element comes to the viewport which prevents the javascript engine to run Intersection Observer API : Demo - UsefulAngle Target Apr 18, 2021 · What is Intersection Observer API? Basically, Intersection Observer will monitor elements and check if they're intersect with the viewport of an document or, most of time, the browser viewport. If you do not have @ng-web-apis/common: Jan 22, 2018 · xterm. e. The Intersection Observer API provides an interface to get the position and visibility of DOM elements relative to a container element or to browser top level viewport. Jul 22, 2021 · Javascript Intersection Observer API – removing the listener, watching only for half of the element, changing the viewport Daniel July 22, 2021 July 23, 2021 In yesterday's post , we have taken an initial look at what the Intersection Observer is. Jun 24, 2021 · The Intersection Observer API addresses the above issues by giving developers a new method to asynchronously query the position of an element with respect to other elements or the global viewport. This API is currently supported in Chrome, Edge, and Firefox, with a ticket open to add it to Webkit. observe( element ); } // I get called once when the host element is being destroyed. May 11, 2021 · I have created a hook called use-visibility-detector to tap into the Intersection Observer API. How to use it: We need two basic elements to use this API. This way, sites no longer need to do anything on the main thread to watch for this kind of element intersection, and the browser is free to optimize the management of intersections as it sees fit. It’s very commonly used for lazy loading but can also be used for things like animations or changing the active state of links in a navigation bar as you scroll to different sections of a page. lets code register a callback function that is executed whenever an element they wish to monitor enters or exits another element (or the viewport), or when the amount by which the two intersect changes by a requested amount. It is browser API that provides users a way to observe given elements and monitor changes in their intersection like the name says "INTERSECTION" with a given ancestor element or the viewport (Browser window) itself. Hopefully browser support continues to improve and we’ll be able to use it soon in production sites without needing a polyfill. The Intersection Observer API. This is a tiny instance that reveals tips on how to detect if a component is within the viewport utilizing the Intersection Observer API. IntersectionObserver Definitions. mozilla. js. s comes into view. Intersection Observers have the goal of providing "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. We simply create an intersection observer object like: let observer = new IntersectionObserver(callback, options); The IntersectionObserver object’s constructor takes two parameters. Once the map has started to load you can stop observing by using observer. Jan 24, 2019 · The Intersection Observer is a more performant and friendly to use API to track how much of an element is visible in the current viewport. This is a library for declarative use of Intersection Observer API with Angular. The need for such information has a lot of use cases, such as implementing lazy-loading and infinite scrolling, just to name a few. Như vậy IntersectionObserver sẽ theo dõi bất đồng bộ (async) sự giao nhau của phần tử này với phần tử khác. In modern web design and development, the Intercept Observer can be very useful. It's spec is currently in working draft, however over the past year (since spring 2020) support for the Intersection Observer API has been solidified across major mobile browsers, extending its broad desktop support. The root is the element which waits for an object to intersect it. Jul 06, 2021 · Infinite scrolling can be done in other ways, in the on scroll approach, every time a user scrolls, but we have to keep calculating scroll positions and can debounce for delays. Es una API del navegador que nos permite detectar cuando un elemento es visible en pantalla, o (y acá está lo bueno) cuando el elemento está por serlo, y con esto poder realizar alguna acción. Feb 15, 2019 · The Intersection Observer v1 API can tell you when an element is scrolled into the window's viewport, but it doesn't tell you whether the element is covered by any other page content (that is, when the element is occluded) or whether the element's visual display has been modified by visual effects like transform, opacity, filter, etc. It looks like this: IntersectionObserver(callback, options); The callback is called every time the threshold is crossed in one way or the other. Jul 10, 2021 · Usage: If using the intersection observer with the window with no margin all that is needed is to import observe and call it. com observer. 27 April, 2016. Nov 11, 2020 · The Intersection Observer API allows you to observe and react to changes when an element enters the viewport or a parent element. ” — Mozilla Docs. You can find the Mozilla portal / hompage here. Jun 09, 2020 · What is Intersection Observer API. Think of root as the outer rectangle, or the rectangle within which you want to observe for an intersection. As I said, the primary motivation for this API is to prevent those situations where a fraud might be possible, or people could abuse the user’s privacy in a way especially if the said content is put in an iframe. set( element, callback ); this. I have defined the options like this: Dec 30, 2020 · 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. target is the element which you are watching. Jan 12, 2018 · In this function you define all the settings for your map. May 29, 2019 · Intersection Observer – Play on Words Illustration. 0 reactions. It takes an element as the first parameter, an array of numbers 0-1 as the second, and lastly a callback in the form of (Observer Entry, Observer State) => void. is no different. getBoundingClientRect (); But adding that scroll event can be a sad story for frontend developers. This browser API was created by Mozilla. Real world examples are: Jun 16, 2021 · 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. Dec 31, 2020 · When the intersection status // changes, the given callback is invoked with the new status. The top use cases for the intersection observer are: Sticky navigation bars; Live table of contents; Some scrolling effects Sep 08, 2016 · Here are some reference links to more thorough documentation, covering both the API and its rationale: IntersectionObserver’s Coming into View Intersection Observers Explained Nov 11, 2020 · The Intersection Observer API allows you to observe and react to changes when an element enters the viewport or a parent element. getBoundingClientRect() method. Just look at its definition from MDN: “The Intersection Observer API provides a way to asynchronously observe changes in the Mar 16, 2020 · The Intersection Observer API is a relatively new functionality in web browsers that can dispatch events when an element’s visibility status changes. Feb 21, 2019 · The Intersection Observer API is a new-ish API and it is the main reason I came up with this tutorial (I've wanted an excuse to use the Intersection Observer API for a while now). unobserve (element). Thanks to Angular's directives, we can create a reusable way to use this API in a declarative and easy way. Jul 10, 2019 · The Intersection Observer API is a perfect fit for this use-case. Talking about the name of the API, the word 'intersection' comes from the fact that this API only looks for intersections i. " Jul 10, 2021 · Usage: If using the intersection observer with the window with no margin all that is needed is to import observe and call it. In short, the Intersection Observer API allows us to easily detect whether an element is currently within the browser's viewport (i. Today and tomorrow, we’re going to look at how the API works. Jun 16, 2021 · 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. The Problem. If options isn't specified, the observer uses the document's viewport as the root, with no margin, and a 0% threshold (meaning that even a one-pixel change is enough to trigger a callback). . Create the React hook First, let's start with an empty hook like this: May 15, 2020 · This is done using the intersection observer API to detect which section it's on and scrollIntoView to scroll to each section. The asynchronous delivery eliminates the need for costly DOM and style queries, continuous polling, and use of custom plugins. Practical, real world examples of IntersectionObserver API - IntersectionObserver API examples The Intersection Observer REST API allows developers to access and integrate the functionality of Intersection Observer with other applications. To trigger the IntersectionObserver you have to use observer. Nov 08, 2021 · The Intersection Observer API was created as a solution to solve the issues associated with "scroll events". The ancestor element or viewport is referred to as the root. 13 | 3 minutes read Detecting which elements are visible within the current viewport’s boundaries has always been a tricky and expensive task in terms of performance. The Intersection Observer API provides a way for us to asynchronously observe changes in the visibility of our elements or the relative visibility of two elements in relation to each other. May 22, 2019 · The API is the Intersection Observer. The purpose of this API is to track the position and visibility of elements in the browser. The Mozilla Intersection Observer API is not currently available on the RapidAPI marketplace. You also have to provide a Google Maps API key. Oct 25, 2017 · 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. You may provide a threshold value to determine when to begin observing the intersection, where a value of 0. Using Intersection Observer makes it less resource intensive and a lot easier to implement compared to listening for scroll events and checking if an element is about to enter the viewport. Aug 12, 2018 · To fully understand why the Intersection Observer API is so much better for performance, let’s start with a look at the basics. Apr 27, 2021 · 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. Jan 22, 2018 · xterm. observe (element). Sep 08, 2016 · Here are some reference links to more thorough documentation, covering both the API and its rationale: IntersectionObserver’s Coming into View Intersection Observers Explained Lazy Load Images Using Intersection Observer API. That’s where the Intersection Observer API comes in. The Intersection Observer API gives you a subscribable model that you can observe in order to be notified when an element enters the viewport. In other words, it provides an alternative solution for exhaustive watch processes that used to be done by scroll events. Jun 26, 2018 · react-intersection-list. An intersection observer can observe as many elements as one desires using the observe() method as we shall see later on. hide. Part of Web APIs for Angular. Nov 18, 2021 · As the purpose of this article is infinite loading, we’re not going to go into the implementation details of the Intersection Observer API, and instead use an existing React Hook that provides that functionality for us, react-cool-inview. The IntersectionObserver interface of 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. It usually boils down to checking scroll events and/or using element. From a development standpoint, the Intersection Observer has a root element that observes other descendants of that root, which helps understand movement of elements across the DOM in relation to each other. Oct 27, 2017 · The Intersection Observer API has been out for a little while now, and is supported by most of the main browsers. Sep 05, 2017 · But working with a new API has its challenges and the Intersection Observer API. Jul 25, 2021 · The Intersection observer API allows you to determine when and how much of an element is visible inside another element. Jan 19, 2021 · 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, which was introduced in 2017. mapping. 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. This topic was modified 2 years, 4 months ago by balbc. We want to load images only when we can see them within the viewport. Apr 05, 2018 · “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. Nov 02, 2020 · The intersection observer is a browser API that lets us observe when things intersect with the viewport. Before the Intersection Observer API had been available customized solutions were created for detecting that Jul 22, 2021 · Javascript Intersection Observer API – removing the listener, watching only for half of the element, changing the viewport Daniel July 22, 2021 July 23, 2021 In yesterday's post , we have taken an initial look at what the Intersection Observer is. It 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. e when an element known as the target cuts through another element known as the root . Jul 17, 2019 · 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. Meanwhile, you can check out the top APIs that currently available for developers. Image by Arnelle Balane. Just look at its definition from MDN: “The Intersection Observer API provides a way to asynchronously observe changes in the Jun 13, 2016 · The Intersection Observer API explained. This post introduces the problem, what Intersection Observer is and why it’s such a good fit. Intersection Observer API for Angular. org Using the Effect Hook - React Aug 01, 2020 · The Intersection Observer API is a relatively new functionality in web browsers that can allows us to listen to events when an element’s visibility on the page changes. 06. For more information, please refer to the MDN docs. This API can trigger callbacks when elements enter or exit the viewport. # State. Jan 25, 2021 · Intersection Observer API. Create the React hook First, let's start with an empty hook like this: Apr 02, 2021 · Intersection Observer API So, seemingly unrelated Web APIs, with different use-cases, but still, having one thing in common - the observer-based architecture. Intersection Observer API provides an easy way to watch and register callbacks to trigger when elements on a page come into view. To lazy load our images, we have to define Apr 18, 2021 · What is Intersection Observer API? Basically, Intersection Observer will monitor elements and check if they're intersect with the viewport of an document or, most of time, the browser viewport. Historically, detecting visibility of an element, or the relative visibility of two elements in relation to each other, has been a difficult task for which The Intersection Observer API addresses the above issues by giving developers a new method to asynchronously query the position of an element with respect to other elements or the global viewport. Mar 14, 2021 · The Intersection Observer API is an incredibly useful Web API. The IntersectionObserver for which the callback is being invoked. 89% Upvoted. This new API replaces the scroll handler API in many cases. The Intersection Observer API can be used to observe and element and run a callback function when it enters or leaves the viewport (or another element). Oct 25, 2019 · Custom React Hooks and Intersection Observer API. When the user scrolls, then they’re visible. The main exceptions are IE and Safari. public add( element: HTMLElement, callback: Function ) : void { this. However, those images will be loaded by default from the beginning, lowering down the initial load. The Intersection Observer API had been created for web browsers in order to improve the performance o f websites, which detect if specific elements are visible in the viewport of a browser. It can be easily integrated in a React component. A value of 0 means 0% intersection and value of 1 means 100% intersection. One thing that’s still tricky in web development is how to know if a specific element is currently in the user’s viewport. intersection observer api

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