react-scrollama-wrapper

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# react-scrollama-wrapper

React Scrollama Wrapper is an **easy way** to use scrollytelling with **React** and the IntersectionObserver-based **Scrollama** JavaScript library.

This project is at an early stage of development, so there are some bugs and some features are not implemented yet.

I need help to test it and improve it, please send me a pull request.

## About Scrollama

[Scrollama](https://github.com/russellgoldenberg/scrollama) is a modern & lightweight JavaScript library for scrollytelling using IntersectionObserver in favor of scroll events.

Thank you to [@codenberg](https://twitter.com/@codenberg) for the original scrollama library.

The @ap.cx/react-scrollama-wrapper package is a wrapper for the scrollama library. I use it to make scrollytelling with React.

# Version

Version 3.2.x added the `useScrollamaContext` hook.

Version 3.x.x of the @ap.cx/react-scrollama-wrapper package is built over the 3.x.x version of the scrollama library.

Version 2.x.x of the @ap.cx/react-scrollama-wrapper package is built over the 2.x.x version of the scrollama library.

The version 2.x.x is not supported anymore.

The versions are not strictly aligned with each other. The only way to know which version of the scrollama library is used is to check the version of the @ap.cx/react-scrollama-wrapper package.

## Installation

```bash
npm install @ap.cx/react-scrollama-wrapper
```

## Usage

```js
import React from 'react';
...
import { Scrollama, Step } from "@ap.cx/react-scrollama-wrapper"

export default function Home() {

const onStepEnter = (step) => {
    /* add your logic here */
  }

const onStepExit = (step) => {
    /* add your logic here */
  }

const onStepProgress = (step) => {
    /* add your logic here */
  }

return (
    <Scrollama
      progress // remove this line to disable onStepProgress 
      onStepProgress={onStepProgress} 
      onStepEnter={onStepEnter} 
      onStepExit={onStepExit}
      // debug  // add this line to see the debug offset trigger line in your page
    >
      <Step>
        <h1>Step 1</h1>
      </Step>
      <Step>
        <h1>Step 2</h1>
      </Step>
      <Step>
        <h1>Step 3</h1>
      </Step>
      <Step>
        <h1>Step 4</h1>
      </Step>
    </Scrollama>
  )
}

```

Take a look at the code in the [gh-pages](https://thierryc.github.io/react-scrollama-wrapper/) branch of the @ap.cx/react-scrollama-wrapper repository to see how it works.
The gh-pages example is built on [Next.js](https://nextjs.org).

## How to style the component?

You can use className or style or css in js to style the Scrollama and Step component.

```js

```

I use it with [stitches](https://stitches.dev).

```js

... soon

```

#### onStepEnter(callback)

Callback that fires when the top or bottom edge of a step element enters the
offset threshold.

The argument of the callback is an object: `{ element: DOMElement, index: number, direction: string }`

`element`: The step element that triggered

`index`: The index of the step of all steps

`direction`: 'up' or 'down'

#### onStepExit(callback)

Callback that fires when the top or bottom edge of a step element exits the
offset threshold.

The argument of the callback is an object: `{ element: DOMElement, index: number, direction: string }`

`element`: The step element that triggered

`index`: The index of the step of all steps

`direction`: 'up' or 'down'

#### onStepProgress(callback)

Callback that fires the progress (0 - 1) a step has made through the threshold.

The argument of the callback is an object: `{ element: DOMElement, index: number, progress: number }`

`element`: The step element that triggered

`index`: The index of the step of all steps

`progress`: The percent of completion of the step (0 - 1)

Here is how to add a custom component to the Scrollama context with the `useScrollamaContext` hook and remove it before unmounting:

---

**Adding and Removing a Component from Scrollama Context**

The Scrollama library provides a convenient way to create scroll-driven interactions in React applications. To add a component to the Scrollama context and remove it before unmounting, you can follow the steps outlined below.

1. Import the necessary dependencies:
   ```jsx
   import React, { useEffect, useRef } from 'react';
   import { useScrollamaContext } from '@ap.cx/react-scrollama-wrapper';
   ```

2. Create a React ref for your component:
   ```jsx
   const stepRef = useRef(null);
   ```

3. Use the `useScrollamaContext` hook to access the Scrollama context:
   ```jsx
   const removeStep = useScrollamaContext();
   ```

4. Add the component to the Scrollama context when the component mounts:
   ```jsx
   useEffect(() => {
     const remove = removeStep(stepRef);
     return () => {
       remove();
     };
   }, []);
   ```

In the above code, the `useEffect` hook is used to execute the code when the component mounts. The `removeStep` function returned by the `useScrollamaContext` hook is called with the `stepRef` as an argument. The returned `remove` function is stored in the `remove` variable. Finally, the `remove` function is called when the component is unmounted.

**Note**: Include `removeStep` in the effect dependencies so React can re-run the registration if the provider changes.

5. The complete code for a component using Scrollama context and removing it before unmounting might look like this:
   ```jsx
   import React, { useEffect, useRef } from 'react';
   import { useScrollamaContext } from '@ap.cx/react-scrollama-wrapper';

const MyComponent = () => {
     const stepRef = useRef(null);
     const removeStep = useScrollamaContext();

useEffect(() => {
       const remove = removeStep(stepRef);
       return () => {
         remove();
       };
     }, [removeStep]);

// Rest of your component code

return <div ref={stepRef}>Your component content</div>;
   };

export default MyComponent;
   ```

In this example, the `stepRef` is assigned to the `ref` prop of the component's root element (`div`). Make sure to replace `'Your component content'` with your actual component content.

By using this code, your component will be added to the Scrollama context when it mounts, and it will be automatically removed when it unmounts.

---

Remember to install `@ap.cx/react-scrollama-wrapper` and ensure that your React and Scrollama versions satisfy the peer dependency ranges.

### Dependencies (3)

- react >=18.0.0 <20.0.0
- react-dom >=18.0.0 <20.0.0
- scrollama ^3.2.0
 
 ### A wrapper for Scrollama
 
 This repo is NOT a fork of react-scrollama but a wrapper over the great original **Scrollama** made and supported by [Russell Goldenberg](https://github.com/russellgoldenberg).

### Alternatives

- [react-scrolly](https://github.com/garfieldduck/react-scrolly)
- [Scrollama](https://github.com/russellgoldenberg/scrollama)
- [Waypoints](http://imakewebthings.com/waypoints/)
- [ScrollMagic](http://scrollmagic.io/)
- [graph-scroll.js](https://1wheel.github.io/graph-scroll/)
- [ScrollStory](https://sjwilliams.github.io/scrollstory/)
- [enter-view](https://github.com/russellgoldenberg/enter-view)

## Design scrolly-telling

Here are some references to help you design better scrolly-telling:

- [How To Scroll](https://bost.ocks.org/mike/scroll/) by Mike Bostock
- [Responsive scrollytelling best practices](https://pudding.cool/process/responsive-scrollytelling/) (The Pudding)

## IntersectionObserver polyfill

You must include the [IntersectionObserver polyfill](https://github.com/w3c/IntersectionObserver) yourself for cross-browser support.
Check on [caniuse (intersectionobserver)](https://caniuse.com/#feat=intersectionobserver) to see if you need to include the polyfill.

[IntersectionObserver library polyfills](https://github.com/w3c/IntersectionObserver) is the native IntersectionObserver API in unsupporting browsers. See the API documentation for usage information.

### License

Like the original, @ap.cx/react-scrollama-wrapper is licensed under the MIT license.

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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