GNARLY CODE Production Introducing

React Scroll State

Bunch of components that will help you to lock, track, change and restore scroll position on routing properly.

Installation

npm i --save @gnarlycode/react-scroll-state

Usage

First of all you should add next global styles to your app:

html.html-scroll-lock {
  overflow-y: scroll;
}

body.body-scroll-lock {
  overflow: hidden;
  position: fixed;
}

You can get this names as strings importing it:

import { injectGlobal } from 'styled-components'
import {
  defaultBodyLockClass,
  defaultHtmlLockClass,
} from '@gnarlycode/react-scroll-state'

injectGlobal`
  html.${defaultHtmlLockClass} {
    overflow-y: scroll;
  }

  body.${defaultBodyLockClass} {
    overflow: hidden;
    position: fixed;
  }
`

You can use your own classnames. In this case you should pass it to ScrollStateProvider

ScrollStateProvider

Manages all scroll operations. You can just wrap all your app with this provider:

import { App } from 'your-app'
import { ScrollStateProvider } from '@gnarlycode/react-scroll-state'

return (
  <ScrollStateProvider>
    <App />
  </ScrollStateProvider>
)

You can pass custom lock classes as bodyLockClass and htmlLockClass props.

ScrollLocker

Locks browser scroll when mounted:

import { ScrollLocker } from '@gnarlycode/react-scroll-state'

return (
  <>
    ...
    {isScrollLocked && <ScrollLocker />}
    ...
  </>
)

ScrollRestorer

This component restores scroll position when history changes. Designed to work with React Router 4.

It uses withRouter and withScrollState under the hood so should be mounted anywhere inside Router and ScrollStateProvider:

import { App } from 'your-app'
import {
  ScrollRestorer,
  ScrollStateProvider,
} from '@gnarlycode/react-scroll-state'

return (
  <ScrollStateProvider>
    <ScrollRestorer />
    <App />
  </ScrollStateProvider>
)

withScrollState

The high-order component provides you scrollState from ScrollStateProvider as prop:

import { withScrollState } from '@gnarlycode/react-scroll-state'

const myComponent = withScrollState(({ scrollState }) => <div />)

The scrollState object will contain next fields:

export interface ScrollStateContext {
  animateScroll(to: number, duration?: number): void
  getScrollPosition(): number
  isScrollLocked(): boolean
  lockScroll(): void
  scrollEvent: {
    fire(): void
    subscribe(fn: () => void)): void
    unsubscribe(fn: () => void)): void
  }
  setScrollPosition(scroll: number): void
  unlockScroll(): void
}

Author: Dmitry Podlesny