react-parallax

react-parallax

Install

yarn add react-parallax

Demo on codesandbox

Contribute

If you find any bug or have problems and/or ideas regarding this library feel free to open an issue or pull request. Either way please create a working example so I can reproduce it. Link to a repository or even easier - fork the demo codesandbox project. This would help a lot.

This project is maintained during evenings and weekends. If you like it, please consider to buy me a coffee ;-) ...or contribute in other ways.

Usage examples

Basic - background image with fixed blur effect

import { Parallax } from 'react-parallax';

const Container = () => (
    <Parallax blur={10} bgImage="path/to/image.jpg" bgImageAlt="the cat" strength={200}>
        Content goes here. Parallax height grows with content height.
    </Parallax>
);

Dynamic blur and negative strength for reverse direction

import { Parallax, Background } from 'react-parallax';

const Container = () => (
    <Parallax
        blur={{ min: -15, max: 15 }}
        bgImage={require('path/to/another/image.jpg')}
        bgImageAlt="the dog"
        strength={-200}
    >
        Blur transition from min to max
        <div style={{ height: '200px' }} />
    </Parallax>
);

Custom background element

Use the background component for custom elements. Unlike the bgImage this one will not be scaled depending on the parent/window width.

import { Parallax, Background } from 'react-parallax';

const Container = () => (
    <Parallax strength={300}>
        <Background className="custom-bg">
            <img src="http://www.fillmurray.com/500/320" alt="fill murray" />
        </Background>
    </Parallax>
);

Render prop

Calculate your own stuff depending on the percentage value.

import { Parallax, Background } from 'react-parallax';

const Container = () => (
    <Parallax
        bgImage="/path/to/another/image"
        renderLayer={percentage => (
            <div
                style={{
                    position: 'absolute',
                    background: `rgba(255, 125, 0, ${percentage * 1})`,
                    left: '50%',
                    top: '50%',
                    width: percentage * 500,
                    height: percentage * 500,
                }}
            />
        )}
    >
        <p>... Content</p>
    </Parallax>
);

Background Component

Child nodes inside this Background will be positioned like the bgImage behind the other children. Unlike the bgImage there is no automatic scaling.

Props

bgImage

path to the background image that makes parallax effect visible - (type: String)

bgImageAlt

alt text for bgImage - (type: String)

bgImageSizes

img sizes attribute

bgImageSrcSet

img srcset attribute

style

style object for the component itself - (type: Object)

bgStyle

additional style object for the bg image/children - (type: Object) Valid style attributes

bgClassName

custom classname for image - (type: String)

contentClassName

custom classname for parallax inner - (type: String) - default: 'react-parallax-content'

bgImageStyle

set background image styling - (type: Object), eg. {height: '50px', maxWidth: '75px', opacity: '.5'}

strength

parallax effect strength (in pixel), default 100. this will define the amount of pixels the background image is translated - (type: Number)

blur

• pixel value for background image blur, default: 0 - (type: Number)
• or object in format {min:0, max:5} for dynamic blur depending on scroll position

renderLayer:

Function that gets a percentage value of the current position as parameter for custom calculationa. It renders a layer above the actual background, below children. Implement like renderLayer={percentage => (<div style={{ background:｀rgba(255, 125, 0, ${percentage * 1})｀}}/> )} - (type: Function)

disabled

turns off parallax effect if set to true, default: false - (type: Boolean)

className

set an additional className - (type: String)

parent

set optional parent for nested scrolling, default: document - (type: Node)

Children

... used to display any content inside the react-parallax component

Development

# setup
yarn
# Development, live reload, JSX transpiling, run:
yarn dev

Port 3000 on all OS by default. Can be set with option -port=8080

License

MIT