FadeInAnimation Component Documentation

The FadeInAnimation component is designed to wrap around other elements and provides a fade-in animation when the wrapped elements come into the viewport.

Props

delay (string): A string representing the delay before the animation starts, e.g., "0.5s". This prop is optional.
children (React Node): The elements that the FadeInAnimation component wraps around.

State

isShown (boolean): A state variable that toggles to true when the wrapped elements intersect the viewport.

Rendered UI

The FadeInAnimation component renders a div element that wraps around the children prop. The wrapper div has a class of pop-in-section and a conditional class of is-show which is added when the isShown state variable is true. The transitionDelay style is set based on the delay prop.

Usage

import React from "react";
import FadeInAnimation from "./FadeInAnimation";
 
function App() {
    return (
        <FadeInAnimation delay="0.5s">
            <div>Your content here</div>
        </FadeInAnimation>
    );
}
 
export default App;

Behavior

The FadeInAnimation component uses the IntersectionObserver API to monitor the visibility of the div element that wraps around the children prop.
When the div element comes into the viewport (isIntersecting is true), the isShown state variable is set to true.
The is-show class is conditionally added to the div element based on the isShown state variable.
The transitionDelay style property of the div element is set based on the delay prop.
The IntersectionObserver instance stops observing the div element when the component is unmounted, to prevent memory leaks.

Styling

The component relies on external CSS for the actual animation, using classes pop-in-section and is-show. The transitionDelay style is applied inline based on the delay prop.

Dependencies

React

Accessibility

The FadeInAnimation component does not have specific accessibility features. It is advisable to ensure that the fade-in animation does not hinder the accessibility of the wrapped content, especially for users with motion sensitivity.

Customization

The fade-in animation and styling can be customized by modifying the external CSS associated with the pop-in-section and is-show classes. Further customization can be done by extending the component to accept additional props for controlling other aspects of the animation or styling.

Cleanup

The useEffect hook includes a cleanup function to call observer.unobserve() when the component is unmounted, preventing potential memory leaks associated with the IntersectionObserver instance.

Intersection Observer

The IntersectionObserver is used to asynchronously observe changes in the intersection status of the div element with the viewport, which triggers the fade-in animation when the element comes into view.

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