README.md

react-responsive-picture

A future-proof responsive image component that supports latest <picture> specification. Uses picturefill for backward compatibility from IE9+.

---

Installation

npm install react-responsive-picture or yarn add react-responsive-picture

Playground

You can also run the examples by cloning the repo and running yarn start.

Usage

import { Picture } from 'react-responsive-picture';

function SomeComponent() {
    return (
        <Picture
            sources = {[
                {
                    srcSet: "path-to-mobile-image.jpg, [email protected] 2x",
                    media: "(max-width: 420px)",
                },
                {
                    srcSet: "path-to-desktop-image.jpg 1x, [email protected] 2x",
                },
                {
                    srcSet: "path-to-desktop-image.webp",
                    type: "image/webp"
                }
            ]}
        />
    );
}

Props

Prop	Type	Default	Definition
sources	array		The array of source objects. Check Sources section for more information.
src	string	(transparent pixel)	Source for standalone/fallback image. To prevent issues in some browsers, by default src is set to a 1x1 transparent pixel data image.
sizes	string		Sizes attribute to be used with src for determing best image for user's viewport.
alt	string		Alternative text for image
className	string		Any additional CSS classes you might want to use to style the image

Examples

Simple image

Normal <img> like behaviour. The same image is displayed on every device/viewport.

<Picture src="path-to-image.jpg" />

will render:

<img srcset="path-to-image.jpg" />

Image with different resolutions

Different images for specific devices (usually retina).

<Picture src="[email protected] 2x, path-to-image.png 1x" />

will render:

<img srcset="[email protected] 2x, path-to-image.png 1x" />

Image with sizes

When you want to let the browser determine the best image for user's current viewport. More information about size attribute on this great blog post.

<Picture
    src="large.jpg 1024w, medium.jpg 640w, small.jpg 320w"
    sizes="(min-width: 36em) 33.3vw, 100vw"
/>

will render:

<img srcset="large.jpg 1024w, medium.jpg 640w, small.jpg 320w" sizes="(min-width: 36em) 33.3vw, 100vw" />

Image with art direction

When you want to explicitly control which image is displayed at specific viewport sizes.

<Picture
    sources = {[
        {
            srcSet: "path-to-mobile-image.jpg, [email protected] 2x",
            media: "(max-width: 420px)",
        },
        {
            srcSet: "path-to-desktop-image.jpg 1x, [email protected] 2x",
        },
        {
            srcSet: "path-to-desktop-image.webp",
            type: "image/webp"
        }
    ]}
/>

will render:

<picture>
    <source srcset="path-to-mobile-image.jpg, [email protected] 2x" media="(max-width: 420px)">
    <source srcset="path-to-desktop-image.jpg 1x, [email protected] 2x">
    <source srcset="path-to-desktop-image.webp" type="image/webp">
    <img srcset="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" />
</picture>

The sources prop is where you can determine the behaviour of the <Picture> component and which images will show for the specific screens.

For each source you can send an object containing srcSet, media and type although the last two are optional.

Styling

You can use your favourite styling library and style the Picture component using the className prop.

import { css } from "emotion";

<Picture 
    className={css`
      opacity: 0.7;
    `}
    src="[email protected] 2x, path-to-image.png 1x" 
/>

Fullsize images

There's also a <FullsizePicture> component that you can use to display full-size images using the same benefits of <Picture> for art direction.

<div style={{ height: 200 }}>
    <FullsizePicture
        sources = {[
            {
                srcSet: "path-to-mobile-image.jpg, [email protected] 2x",
                media: "(max-width: 420px)",
            },
            {
                srcSet: "path-to-desktop-image.jpg 1x, [email protected] 2x",
            },
        ]}
    />
</div>

It will automatically fill the parent element maintaining the original image ratio. Please note that the parent element needs to have a defined height as you would expect for any background image as well.

Props

FullsizePicture accepts the same props as Picture plus a few more for styling and positioning.

Prop	Type	Default	Definition
sources	array		The array of source objects. Check Sources section for more information.
src	string	(transparent pixel)	Source for standalone/fallback image. To prevent issues in some browsers, by default src is set to a 1x1 transparent pixel data image.
sizes	string		Sizes attribute to be used with src for determing best image for user's viewport.
alt	string		Alternative text for image
className	string		Any additional CSS classes you might want to use to style the image
wrapperClassName	string		Any additional CSS classes you might want to use to style the wrapper of the Picture component
cover	"both" | "width" | "height"	"both"	Decides the fullsize behaviour of the Picture component. By default it covers the entire parent, but can be changed to cover just the height or width instead.
center	boolean	true	Helper prop to horizontally and vertically center the image.

Use as background image

If you want to use FullsizePicture as a background image for other components, you can pass them as children too.

<section style={{ height: 200 }}>
    <FullsizePicture
        sources = {[
            {
                srcSet: "path-to-mobile-image.jpg, [email protected] 2x",
                media: "(max-width: 420px)",
            },
            {
                srcSet: "path-to-desktop-image.jpg 1x, [email protected] 2x",
            },
        ]}
    >
      <Heading1>This is the section title</Heading1>
    </FullsizePicture>
</section>

Contributing

Please follow our contributing guidelines.

License

MIT