https://github.com/rehooks/component-size

React hook for determining the size of a component
https://github.com/rehooks/component-size

component element hook react size

Last synced: about 2 months ago
JSON representation

React hook for determining the size of a component

• Host: GitHub
• URL: https://github.com/rehooks/component-size
• Owner: rehooks
• License: mit
• Created: 2018-10-25T19:39:39.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2023-02-05T10:55:06.000Z (almost 2 years ago)
• Last Synced: 2024-04-28T09:43:16.039Z (8 months ago)
• Topics: component, element, hook, react, size
• Language: JavaScript
• Homepage:
• Size: 137 KB
• Stars: 238
• Watchers: 4
• Forks: 23
• Open Issues: 18
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# `@rehooks/component-size`

## Install

```sh

yarn add @rehooks/component-size

```

## Usage

```js

import { useRef } from 'react'

import useComponentSize from '@rehooks/component-size'

function MyComponent() {

  let ref = useRef(null)

  let size = useComponentSize(ref)

  // size == { width: 100, height: 200 }

  let { width, height } = size

  let imgUrl = `https://via.placeholder.com/${width}x${height}`

  return (

    


      

    

  )

}

```


## ResizeObserver

[Resize Observer](https://developers.google.com/web/updates/2016/10/resizeobserver)

is the API is used to determine if an element is resized. Browser support is pretty good in Chrome, but is still missing support in other major browsers.

> [Can i use ResizeObserver?](https://caniuse.com/#feat=resizeobserver)

### Polyfill

You can import the

[polyfill](https://github.com/que-etc/resize-observer-polyfill) directly from here

```sh

yarn add resize-observer-polyfill

```

Then import it in your app:

```js

import 'resize-observer-polyfill'

```

If you are using Webpack (or similar) you could use [dynamic

imports](https://webpack.js.org/api/module-methods/#import-), to load the

Polyfill only if needed. A basic implementation could look something like this:

```js

loadPolyfills()

  .then(() => /* Render React application now that your Polyfills are ready */)

/**

* Do feature detection, to figure out which polyfills needs to be imported.

**/

function loadPolyfills() {

  const polyfills = []

  if (!supportsResizeObserver()) {

    polyfills.push(import('resize-observer-polyfill'))

  }

  return Promise.all(polyfills)

}

function supportsResizeObserver() {

  return (

    'ResizeObserver' in global &&

    'ResizeObserverEntry' in global &&

    'contentRect' in ResizeObserverEntry.prototype

  )

}

```