React Color Alpha
===
[](https://jaywcjlove.github.io/#/sponsor)
[](https://x.com/jaywcjlove)
[](https://www.npmjs.com/package/@uiw/react-color-alpha)
[](https://uiwjs.github.io/npm-unpkg/#/pkg/@uiw/react-color/file/README.md)
Alpha is a subcomponent of [**`@react-color`**](https://uiwjs.github.io/react-color).
[](https://uiwjs.github.io/react-color/#/alpha)
## Install
```bash
npm i @uiw/react-color-alpha
```
## Usage
```jsx mdx:preview
import React, { useState } from 'react';
import { hsvaToRgbaString } from '@uiw/color-convert';
import Alpha from '@uiw/react-color-alpha';
export default function Demo() {
const [hsva, setHsva] = useState({ h: 0, s: 0, v: 68, a: 1 });
return (
<>
{
setHsva({ ...hsva, ...newAlpha });
}}
/>
{
setHsva({ ...hsva, ...newAlpha });
}}
/>
{
setHsva({ ...hsva, ...newAlpha });
}}
/>
{
setHsva({ ...hsva, ...newAlpha });
}}
/>
{JSON.stringify(hsva)}
);
}
```
## Props
```ts
import React from 'react';
import { HsvaColor } from '@uiw/color-convert';
import { Interaction } from '@uiw/react-drag-event-interactive';
import type * as CSS from 'csstype';
import { PointerProps } from './Pointer';
export * from './Pointer';
export interface AlphaProps extends Omit, 'onChange'> {
prefixCls?: string;
/** String, Pixel value for picker width. Default `316px` */
width?: CSS.Properties['width'];
/** String, Pixel value for picker height. Default `16px` */
height?: CSS.Properties['height'];
/** hsva => `{ h: 0, s: 75, v: 82, a: 1 }` */
hsva: HsvaColor;
/** React Component, Custom pointer component */
pointer?: (props: PointerProps) => JSX.Element;
/** Set rounded corners. */
radius?: CSS.Properties['borderRadius'];
/** Set the background color. */
background?: string;
/** Set the background element props. */
bgProps?: React.HTMLAttributes;
/** Set the interactive element props. */
innerProps?: React.HTMLAttributes;
pointerProps?: PointerProps;
/** String Enum, horizontal or vertical. Default `horizontal` */
direction?: 'vertical' | 'horizontal';
/** Flip alpha progression along the current axis. */
reverse?: boolean;
onChange?: (newAlpha: {
a: number;
}, offset: Interaction) => void;
}
export declare const BACKGROUND_IMG = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAMUlEQVQ4T2NkYGAQYcAP3uCTZhw1gGGYhAGBZIA/nYDCgBDAm9BGDWAAJyRCgLaBCAAgXwixzAS0pgAAAABJRU5ErkJggg==";
declare const Alpha: React.ForwardRefExoticComponent>;
export default Alpha;
interface PointerProps extends React.HTMLAttributes {
prefixCls?: string;
left?: string;
top?: string;
}
```
## Contributors
As always, thanks to our amazing contributors!
Made with [contributors](https://github.com/jaywcjlove/github-action-contributors).
## License
Licensed under the MIT License.
