react-medium-image-zoom

The original medium.com-inspired image zooming library for React.

View the storybook examples to see various usages.

Features:

• <img />, including all object-fit values, any object-position, and loading="lazy"
• <div> and <span> with any background-image, background-size, and background-position
• <picture> with <source /> and <img />
• <figure> with <img />
• <svg>
• Custom zoom modal content (👇)
• Accessibility:
  • JAWS in Chrome, Edge, and Firefox (Windows)
  • NVDA in Chrome, Edge, and Firefox (Windows)
  • VoiceOver in Safari (macOS, iOS)
  • TalkBack in Chrome (Android)
• Supports popular tools:
  • Gatsby and gatsby-plugin-image
  • Next.js
• Zero dependencies

Requirements to know about:

• <dialog> element (caniuse dialog)
• ResizeObserver (caniuse ResizeObserver)
• Package build target is ES2021. If you need to support older environments, run this package through your build system.

Media and Tutorials

• 2024-08-2024 — React Round Up — "Building a Seamless Image Zoom Feature"
• Build a React.js Image Zoom Feature with react-medium-image-zoom Library and State Management

Quickstart

npm install --save react-medium-image-zoom

import React from 'react'
import Zoom from 'react-medium-image-zoom'
import 'react-medium-image-zoom/dist/styles.css'

export const MyImg = () => (
  <Zoom>
    <img
      alt="That Wanaka Tree, New Zealand by Laura Smetsers"
      src="/path/to/thatwanakatree.jpg"
      width="500"
    />
  </Zoom>
)

API

You can pass these options to either the Uncontrolled (default) or Controlled components.

export interface UncontrolledProps {
  // Accessible label text for when you want to unzoom.
  // Default: 'Minimize image'
  a11yNameButtonUnzoom?: string

  // Accessible label text for when you want to zoom.
  // Default: 'Expand image'
  a11yNameButtonZoom?: string

  // Allow swipe gesture to unzoom.
  // Default: true
  canSwipeToUnzoom?: boolean

  // Your image (required).
  children: ReactNode

  // Custom CSS className to add to the zoomed <dialog>.
  classDialog?: string

  // Provide your own unzoom button icon.
  // Default: ICompress
  IconUnzoom?: ElementType

  // Provide your own zoom button icon.
  // Default: IEnlarge
  IconZoom?: ElementType

  // Disables the zoom/unzoom behavior.
  // Default: false
  isDisabled?: boolean

  // First argument: boolean value of a new zoomed state (Uncontrolled
  // component) or a suggested new state (Controlled component).
  // Second argument: object containing the event that triggered the change.
  // Default: undefined
  onZoomChange?: (
    value: boolean,
    data: { event: React.SyntheticEvent | Event },
  ) => void

  // Swipe gesture threshold after which to unzoom.
  // Default: 10
  swipeToUnzoomThreshold?: number

  // Specify what type of element should be used for
  // internal component usage. This is useful if the
  // image is inside a <p> or <button>, for example.
  // Default: 'div'
  wrapElement?: 'div' | 'span'

  // Provide your own custom modal content component.
  ZoomContent?: (props: {
    img: ReactElement | null
    buttonUnzoom: ReactElement<HTMLButtonElement>
    onUnzoom: () => void
  }) => ReactElement

  // Higher quality image attributes to use on zoom.
  zoomImg?: ImgHTMLAttributes<HTMLImageElement>

  // Offset in pixels the zoomed image should
  // be from the window's boundaries.
  // Default: 0
  zoomMargin?: number
}

You can pass these options to only the Controlled component.

export interface ControlledProps {
  // ...same as UncontrolledProps

  // Tell the component whether or not it should be zoomed
  // Default: false
  isZoomed: boolean
}

Basic Usage

Uncontrolled component (default)

Import the component and the CSS, wrap your image with the component, and the component will handle it's own state.

import React from 'react'
import Zoom from 'react-medium-image-zoom'
import 'react-medium-image-zoom/dist/styles.css'

// <img />
export const MyImg = () => (
  <Zoom>
    <img
      alt="That Wanaka Tree, New Zealand by Laura Smetsers"
      src="/path/to/thatwanakatree.jpg"
      width="500"
    />
  </Zoom>
)

// <div>
export const MyDiv = () => (
  <Zoom>
    <div
      aria-label="That Wanaka Tree, New Zealand by Laura Smetsers"
      role="img"
      style={{
        backgroundColor: '#fff',
        backgroundImage: `url("/path/to/thatwanakatree.jpg")`,
        backgroundPosition: '50%',
        backgroundRepeat: 'no-repeat',
        backgroundSize: 'cover',
        height: '0',
        paddingBottom: '56%',
        width: '100%',
      }}
    />
  </Zoom>
)

// <picture>
export const MyPicture = () => (
  <Zoom>
    <picture>
      <source media="(max-width: 800px)" srcSet="/path/to/teAraiPoint.jpg" />
      <img
        alt="A beautiful, serene setting in nature"
        src="/path/to/thatwanakatree.jpg"
        width="500"
      />
    </picture>
  </Zoom>
)

// <figure>
export const MyFigure = () => (
  <figure>
    <Zoom>
      <img
        alt="That Wanaka Tree, New Zealand by Laura Smetsers"
        src="/path/to/thatwanakatree.jpg"
        width="500"
      />
    </Zoom>
    <figcaption>Photo by Laura Smetsers</figcaption>
  </figure>
)

Controlled component

Import the Controlled component and the CSS, wrap your image with the component, and then dictate the isZoomed state to the component.

import React, { useCallback, useState } from 'react'
import { Controlled as ControlledZoom } from 'react-medium-image-zoom'
import 'react-medium-image-zoom/dist/styles.css'

const MyComponent = () => {
  const [isZoomed, setIsZoomed] = useState(false)

  const handleZoomChange = useCallback(shouldZoom => {
    setIsZoomed(shouldZoom)
  }, [])

  return (
    <ControlledZoom isZoomed={isZoomed} onZoomChange={handleZoomChange}>
      <img
        alt="That wanaka tree, alone in the water near mountains"
        src="/path/to/thatwanakatree.jpg"
        width="500"
      />
    </ControlledZoom>
  )
}

export default MyComponent

The onZoomChange prop accepts a callback that will receive true or false based on events that occur (like click or scroll events) to assist you in determining when to zoom and unzoom the component.

Styles

You can import the default styles from react-medium-image-zoom/dist/styles.css and override the values from your code, or you can copy the styles.css file and alter it to your liking. The latter is the best option, given rems should be used instead of px to account for different default browser font sizes, and it's hard for a library to guess at what these values should be.

An example of customizing the transition duration, timing function, overlay background color, and unzoom button styles with :focus-visible can be found in this story: https://rpearce.github.io/react-medium-image-zoom/?path=/story/img--custom-modal-styles

Custom zoom modal content

If you want to customize the zoomed modal experience with a caption, form, or other set of components, you can do so by providing a custom component to the ZoomContent prop.

View the live example of custom zoom modal content.

Below is some example code that demonstrates how to use this feature.

export const MyImg = () => (
  <Zoom ZoomContent={CustomZoomContent}>
    <img
      alt="That Wanaka Tree, New Zealand by Laura Smetsers"
      src="/path/to/thatwanakatree.jpg"
      width="500"
    />
  </Zoom>
)

const CustomZoomContent = ({
  /** Default unzoom button */
  buttonUnzoom,

  /** Current state of the zoom modal: UNLOADED, LOADING, LOADED, UNLOADING */
  modalState,

  /** Your image, prepped for zooming */
  img,

  /** A state to check if the zoom img is loaded (useful for loading state) */
  // isZoomImgLoaded,

  /**
   * A callback to manually unzoom the image and close the modal if you want to
   * use your own buttons or listeners in your custom experience.
   */
  //onUnzoom,
}) => {
  const [isLoaded, setIsLoaded] = useState(false)

  useLayoutEffect(() => {
    if (modalState === 'LOADED') {
      setIsLoaded(true)
    } else if (modalState === 'UNLOADING') {
      setIsLoaded(false)
    }
  }, [modalState])

  const classCaption = isLoaded
    ? 'zoom-caption zoom-caption--loaded'
    : 'zoom-caption'