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https://github.com/airbnb/rheostat

Rheostat is a www, mobile, and accessible slider component built with React
https://github.com/airbnb/rheostat

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Rheostat is a www, mobile, and accessible slider component built with React

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README 

        
# Rheostat



> A mobile, tablet, desktop, and accessible slider for the web.



![Rheostat demo](sample.gif)



## Install



`npm install rheostat`



## Initialize



As of v3.0.0, the `rheostat` project relies on `react-with-styles`. If you want to continue using CSS stylesheets and classes, there is a little bit of extra set-up required to get things going. As such, you need to use to use `rheostat/initialize` to set up class names on your components.



    import 'rheostat/initialize';



For example, the above import should go at the top of your application as you won't be able to import `rheostat` with it.



## Props



The algorithm, by default [`linear`](src/algorithms/linear.js), the slider will use. Feel free to write

your own as long as it conforms to the shape.



```js

  algorithm: PropTypes.shape({

    getValue: PropTypes.func,

    getPosition: PropTypes.func,

  })

```



Custom class name that will be applied to the root of Rheostat.



```js

  className: PropTypes.string

```



Custom React component overrides for the handles, background, and the "progress" bar.



```js

  background: PropTypes.oneOfType([PropTypes.func, PropTypes.string])

  handle: PropTypes.oneOfType([PropTypes.func, PropTypes.string])

  progressBar: PropTypes.oneOfType([PropTypes.func, PropTypes.string])

```



The maximum and minimum possible values, by default 0 - 100.



```js

  max: PropTypes.number

  min: PropTypes.number

```



`pitComponent` is a custom React component for rendering "pits" across the bar.

`pitPoints` is the set of points at which it will render a pit. Points are an array

of `values` on the slider.



```js

  pitComponent: PropTypes.oneOfType([PropTypes.func, PropTypes.string])

  pitPoints: PropTypes.arrayOf(PropTypes.number)

```



NOTE: `onChange` is called whenever the value is changed and committed. This happens at the end of

a drag, keypress, or click event. `onChange` is recommended when you wish to persist the values.



`onValuesUpdated` is a convenience event that is triggered while the value is being actively

changed. This includes dragging, click, or keypress. `onValuesUpdated` is recommended if you need

to work with the values before they're committed.



If you need to perform custom logic to postprocess the handle position, `getNextHandlePosition` accepts

a callback of the form `(handleIdx: int, percentPosition: float) => float`. Return the updated

handle position. This is useful if you need to customize ranges within a single slider.



```js

  onChange: PropTypes.func

  onClick: PropTypes.func

  onKeyPress: PropTypes.func

  onSliderDragEnd: PropTypes.func

  onSliderDragMove: PropTypes.func

  onSliderDragStart: PropTypes.func

  onValuesUpdated: PropTypes.func

  getNextHandlePosition: PropTypes.func

```



`snap` is a boolean which controls the slider's snapping behavior.

`snapPoints` is an array of `values` on the slider where the slider should snap to.



If `snap` is set to true and no `snapPoints` are set then the slider is snapped into an absolute

position. For example, on a scale of 1-10 if the slider is let go at the 54% mark it'll pick the

value 5 and snap to 50%.



```js

  snap: PropTypes.bool

  snapPoints: PropTypes.arrayOf(PropTypes.number)

```



The values, by default 0 and 100.



```js

  values: PropTypes.arrayOf(PropTypes.number)

```



You can disable the slider to prevent the user from moving it.



```js

  disabled: PropTypes.bool

```



## Usage



> Important: Make sure to include the [css file](https://unpkg.com/rheostat@3/css/rheostat.css) or feel free to create your own.



* Simple.



```js

import Rheostat from 'rheostat';



ReactDOM.render(, document.getElementById('slider-root'));

```



* A slider with a multiple handles.



```js

import Rheostat from 'rheostat';



ReactDOM.render((

  

), document.getElementById('slider-root'));

```



### Advanced Styling



The `rheostat/initialize` script actually relies on [react-with-styles-interface-css](https://github.com/airbnb/react-with-styles-interface-css) under the hood. If you are interested in a different solution for styling in your project, you can do your own initialization of a another [interface](https://github.com/airbnb/react-with-styles/blob/master/README.md#interfaces). At Airbnb, for instance, we rely on [Aphrodite](https://github.com/Khan/aphrodite) under the hood and therefore use the Aphrodite interface for `react-with-styles`. If you want to do the same, you would use the following pattern:

```js

import ThemedStyleSheet from 'react-with-styles/lib/ThemedStyleSheet';

import aphroditeInterface from 'react-with-styles-interface-aphrodite';

import DefaultTheme from 'rheostat/lib/themes/DefaultTheme';



ThemedStyleSheet.registerInterface(aphroditeInterface);

ThemedStyleSheet.registerTheme(DefaultTheme);

```



The above code has to be run before any `rheostat` component is imported. Otherwise, you will get an error. Also note that if you register any custom interface manually, you *must* also manually register a theme.



### Theming

`rheostat` also now supports a different way to theme. You can see the default theme values in [this file](https://github.com/airbnb/rheostat/blob/master/src/themes/DefaultTheme.js) and you would override them in the following manner:

```js

import ThemedStyleSheet from 'react-with-styles/lib/ThemedStyleSheet';

import aphroditeInterface from 'react-with-styles-interface-aphrodite';

import DefaultTheme from 'rheostat/lib/themes/DefaultTheme';



ThemedStyleSheet.registerInterface(aphroditeInterface);

ThemedStyleSheet.registerTheme({

  rheostat: {

    ...DefaultTheme.rheostat,

    color: {

      ...DefaultTheme.rheostat.color,

      progressBar: 'red',

    },

  },

});

```



The above code would make the default progress bar red, instead of light blue. Note that you *must* register an interface if you manually register a theme. One will not work without the other.



#### A note on using `react-with-styles-interface-css`

The default interface that `rheostat` ships with is the [CSS interface](https://github.com/airbnb/react-with-styles-interface-css). If you want to use this interface along with the theme registration method, you will need to rebuild the core `rheostat.css` file. We do not currently expose a utility method to build this file, but you can follow along with the code in https://github.com/airbnb/rheostat/blob/master/scripts/buildCSS.js to build your own custom themed CSS file.



### RTL Support



`rheostat` now supports automatic RTL rendering through [`react-with-direction`](https://github.com/airbnb/react-with-direction).



## Live Playground



For more examples you can check out the storybook.



* Clone this repo on your machine.

* `npm install`

* `npm run storybook`

* Visit `http://localhost:9001/`.