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use-viewport-sizes

0.2.8 • Public • Published

use-viewport-sizes

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a tiny React hook which allows you to track visible window viewport size in your components w/ an optional debounce or custom memo function for updates for optimal rendering.

Installation

npm install -D use-viewport-sizes

Benefits

  • extremely lightweight and dependency-free -- 3.75kb without/before gzipping.
  • only one window.onresize handler used to subscribe to any changes in an unlimited number of components as well despite several different paradigms that pull from this.
  • optional debounce to delay updates until user stops dragging their window for a moment; this can make expensive components with size-dependent calculations run much faster and your app feel smoother.
  • debouncing does not create new handlers or waste re-renders in your component; the results are also pooled from only one resize result.
  • optional hash function to update component subtree only at points you would like to.
  • supports SSR (see example under Usage section).

Usage

See it in Action

Interact with the example shown on CodeSandox @ https://codesandbox.io/s/j3vzpqxwww

Without Debouncing

registers dimension changes on every resize event immediately

import React from 'react'
import useViewportSizes from 'use-viewport-sizes'
 
function MyComponent(props) {
    const [vpWidth, vpHeight] = useViewportSizes();
 
    ...renderLogic
}

With Debouncing

If passed a number as the first argument, it registers dimension changes only when a user stops dragging/resizing the window for a specified number of miliseconds. This is useful for listening to expensive components such as data grids which may be too expensive to re-render during window resize dragging.

import React from 'react'
import useViewportSizes from 'use-viewport-sizes'
 
function MyExpensivelyRenderedComponent (props) {
    const [vpWidth, vpHeight] = useViewportSizes(1000); // 1s debounce
 
    ...renderLogic
}

Only update vpW/vpH passed on specific conditions

If passed a function as the first argument, it will use this to calculate a hash that only updates the viewport when the calculation changes. In the example here, we are using it to detect when we have a breakpoint change which may change how a component is rendered if this is not fully possible or inconvenient via CSS @media queries. The hash will also be available as the 3rd value returned from the hook for convenience.

import React from 'react';
import useViewportSizes from 'use-viewport-sizes';
 
function getBreakpoint({ vpW, vpH }) {
    if(vpW < 640) {
        return 'md';
    }
    if(vpW < 320) {
        return 'sm';
    }
    else if(vpW < 240) {
        return 'xs';
    }
    else {
        return 'lg';
    }
}
 
function MyBreakpointBehaviorComponent() {
    const [vpW, vpH, bp] = useViewportSizes(getBreakpoint);
 
    // do-something-with-breakpoints in render
    // and add new update for vpW, vpH in this component's
    // subtree only when a named breakpoint changes
}

Server Side Rendering

While serverside rendering is supported, it requires an explicit update via useEffect since viewport does not actually exist on the server before rendering to client. The following has been tested with NextJS.

Sidenote that you will see a useLayoutEffect warning from React. This is perfectly normal as there is no viewport/context to paint to when pre-rendering in SSR and will not interfere with your app once served to the client

import React, { useLayoutEffect } from 'react'
import useViewportSizes from 'use-viewport-sizes'
 
function MySSRComponent (props) {
    const [vpWidth, vpHeight, updateVpSizes] = useViewportSizes()
 
    // below, we add one post-render update
    // in order to register the client's viewport sizes
    // after serving SSR content
 
    useEffect(()=> { updateVpSizes(); }, []);
 
    ...renderLogic
}

Support

If you have read the examples and have any issues which you know are glitches,or would like to request something changed, please feel free to post an issue on Github.

Otherwise, if this was useful and you'd like to show your support, no donations necessary, but please consider checking out the repo and giving it a star (⭐).

License

Install

npm i use-viewport-sizes

DownloadsWeekly Downloads

762

Version

0.2.8

License

MIT

Unpacked Size

9.96 kB

Total Files

3

Last publish

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