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https://github.com/gerhardsletten/use-snap-slider

React hook / Vanilla JS to manage scroll-state for CSS Scroll Snap
https://github.com/gerhardsletten/use-snap-slider

carusel react react-hooks scroll-snap slider

Last synced: 16 days ago
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React hook / Vanilla JS to manage scroll-state for CSS Scroll Snap

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# use-snap-slider



React hook / Vanilla JS to manage scroll-state for [CSS Scroll Snap](https://caniuse.com/?search=scroll-snap)



![](https://img.shields.io/bundlephobia/min/use-snap-slider)



Gives you states and actions for CSS Scroll Snap sliders:



* `count:number` - total pages

* `countDelta:number` - total slides, for 1/1 width slides the same as count

* `index:number` - current page index

* `indexDelto:number` - current slide index, for 1/1 width slides the same as index

* `prevEnabled:boolean` - can go to previous slide

* `nextEnabled:boolean` - can go to next slide

* `goPrev()` - scroll to previous slide

* `goNext()` - scroll to next slide

* `jumpTo(index:number)` - go to a spesified slide



## Usage



`npm i use-snap-slider`



### Basic usage (react)



In your react component:



See a [more complete react-example here](https://github.com/gerhardsletten/use-snap-slider/blob/main/src/react-example/SnapSliderReact.tsx)



```tsx

import React, { useRef } from 'react'

import { useSnapSlider } from 'use-snap-slider'



export function MySlider () {

  const ref = useRef(null)

  const slides = [1,2]

  // Passing inital count avoid extra render, for best lighthouse score, pass the same count as you show on mobile

  const {index, count, jumpTo, goPrev, goNext, prevEnabled, nextEnabled} = useSnapSlider(ref, slides.length)

  const pages = Array.from(Array(count).keys())

  return (

    


      


        {slides.map((slide) => (

          


            Slide {slide}

          


        ))}

      


      

        {pages.map((page) => (

           jumpTo(page)} disabled={page === index}>{page + 1}

        ))}

      

      

        Prev

        Next

      

    


  )

}

```



### Basic usage (vanilla javascript)



See a [more complete vanilla javascript example here](https://github.com/gerhardsletten/use-snap-slider/blob/main/src/vanilla-example/create-snap-slider.ts)



```ts

import { createSnapSlider } from 'use-snap-slider/dist/snap-slider'



function createSnapSliderVanilla(element: HTMLElement) {

  const { jumpTo, goNext, goPrev, subscribe } = createSnapSlider({

    element,

    count: count,

    index: 0,

  })

  subscribe((state) => {

    // Update UI with sate

  })

  document.querySelector('.prev-btn')?.addEventListener('click', goPrev)

  document.querySelector('.next-btn')?.addEventListener('click', goNext)

}

// Expose globally

window.createSnapSliderVanilla = createSnapSliderVanilla

```



## API



### useSnapSlider react hook



```ts

import { useSnapSlider } from 'use-snap-slider'



const {

  index: number,

  // If displaying multiple slides on the same page, this will be slide at left position

  indexDelta: number,

  // Count of pages

  count: number,

  countDelta: number,

  prevEnabled: boolean,

  nextEnabled: boolean,

  jumpTo: (index: number) => void,

  goNext: () => void,

  goPrev: () => void,

} = useSnapSlider(

  ref: MutableRefObject,

  // Pass inital count

  count?: number = 1,

  // Pass inital index

  index?: number = 0,

  // onPrev / next buttons go to end / start 

  circular = false,

  // Will reset index on change of count, but pass something here to force a reset even if count dont change

  countHash?: string | number

)

```



### createSnapSlider vanilla js function



```ts

import { createSnapSlider } from 'use-snap-slider/dist/snap-slider'



const {

  // Removes event listner for window.resize and element.scroll

  destroy: () => void,

  // Get current state

  getState: () => TSnapSliderStateFull,

  // Go to slide index

  jumpTo: (index?: number, indexDelta?: number) => void,

  goNext: () => void,

  goPrev: () => void,

  // Subscribe to updates

  subscribe: (fn: TSnapListner) => () => void,

  // Set element at later stage

  setElement: (el: HTMLElement) => void,

  // Updates count and countDelta, call if you change inner slides

  calculate: () => void,

  // Should subscribe return a inital publish after subscribing

  initalSubscriptionPublish: boolean = true

} = createSnapSlider({

  element: HTMLDivElement | null,

  count?:number = 1,

  countDelta?:number,

  index?:number = 0,

  circular?:boolean,

  indexDelta?:number,

  itemSelector?:string = ':scope > *',

})

```



## Adding nessesary styles



This library only delivers javascript for handle the state, you will need to make your own component for complete solution. See examples in this repo: 



* [React component](https://github.com/gerhardsletten/use-snap-slider/blob/main/src/react-example/SnapSliderReact.tsx)

* [Vanilla JS function](https://github.com/gerhardsletten/use-snap-slider/blob/main/src/vanilla-example/create-snap-slider.ts)



### TailwindCSS



See also tailwinds own documentation for [scroll snap](https://tailwindcss.com/docs/scroll-snap-type)



```html



  


    Slide 1

  


  


    Slide 2

  




```



### Basic css



```html



.css-slider {

  display: flex;

  overflow-x: auto;

  scroll-snap-type: x mandatory;

  scroll-behavior: smooth;

  -webkit-overflow-scrolling: touch;

}

.css-slider::-webkit-scrollbar {

  display: none;

}

.css-slider-item {

  display: flex;

  scroll-snap-align: start;

  flex-shrink: 0;

}

.css-slider-item-half {

  width: 50%;

}





  


    Slide 1

  


  


    Slide 2

  




```