README.md

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useSize()

npm i @react-hook/size

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A React hook for measuring the size of HTML elements including when they change

Features

• Determines the size of the element including any padding, borders, and scroll bars.
• The size reported by the hook updates each time the size of the element changes.
• Uses a single ResizeObserver for tracking all elements used by the hooks. This approach is astoundingly more performant than using a ResizeObserver per element which most hook implementations do.
• Uses @juggle/resize-observer as a ponyfill when ResizeObserver isn't supported by the current browser.
• Automatically unobserves the target element when the hook unmounts.

Quick Start

Check out an example on CodeSandbox

import * as React from 'react'
import useSize from '@react-hook/size'

const Component = () => {
  const target = React.useRef(null)
  const [width, height] = useSize(target)

  return (
    <div ref={target}>
      <div>Width: {width}</div>
      <div>Height: {height}</div>
    </div>
  )
}

API

useSize(target, options?)

Argument	Type	Required?	Description
target	React.RefObject | T | null	Yes	A React ref created by useRef() or an HTML element
options	UseSizeOptions	No	Options for SSR. See UseSizeOptions.

UseSizeOptions

export interface UseSizeOptions {
  // The initial width to set into state.
  // This is useful for SSR environments.
  initialWidth: 0
  // The initial height to set into state.
  // This is useful for SSR environments.
  initialHeight: 0
}

LICENSE

MIT