<eye-dropper>

A custom element that implements the EyeDropper API that allows the user to select colors from the screen.

Important

The EyeDropper API is still experimental and supported only on desktop Chromium based browsers. In not supported browsers, the color picker button will dispatch an event eye-dropper:error with an error message when clicked. You can check if the API is supported by using the a simple check like 'EyeDropper' in window to decide whether to show the color picker button or handle the error event.

API documentation • Demo

Install

npm install --save @georapbox/eye-dropper-element

Usage

Script

import { EyeDropperElement } from './node_modules/@georapbox/eye-dropper-element/dist/eye-dropper.js';

// Manually define the element.
EyeDropperElement.defineCustomElement();

Alternatively, you can import the automatically defined custom element.

import './node_modules/@georapbox/eye-dropper-element/dist/eye-dropper-defined.js';

Markup

<eye-dropper></eye-dropper>

Style

By default, the component is style-free to remain as less opinionated as possible. However, you can style the various elements of the component using CSS Parts provided for this purpose.

API

Properties

Name	Reflects	Type	Required	Default	Description
disabled	✓	Boolean	-	false	Whether the color picker button is disabled.
copy	✓	Boolean	-	false	Whether the picked color should be copied to clipboard.

Slots

Name	Description
button	The slot for the button element. Example: <a href="#" slot="button" role="button">Pick a color</a>
button-label	The slot for the button label. Example: <span slot="button-label">Pick a color</span>

CSS Parts

Name	Description
button	The color picker button.
button--disabled	The color picker button when is disabled.

Methods

Name	Type	Description	Arguments
defineCustomElement	Static	Defines/registers the custom element with the name provided. If no name is provided, the default name is used. The method checks if the element is already defined, hence will skip trying to redefine it.	elementName='eye-dropper'

Events

Name	Description	Event Detail
eye-dropper:success	Emitted when color pick is successful.	{ result: { sRGBHex: string }, colors: string[] }
eye-dropper:abort	Emitted when color pick is aborted.	-
eye-dropper:error	Emitted if color pick fails for any reason.	{ error: Error | TypeError }
eye-dropper:copy	Emitted if copy property is true and the picked color is successfully copied to clipbaord.	{ value: string }

Changelog

For API updates and breaking changes, check the CHANGELOG.

Development setup

Prerequisites

The project requires Node.js and npm to be installed on your environment. Preferrably, use nvm Node Version Manager and use the version of Node.js specified in the .nvmrc file by running nvm use.

Install dependencies

Install the project dependencies by running the following command.

npm install

Build for development

Watch for changes and start a development server by running the following command.

npm start

Linting

Lint the code by running the following command.

npm run lint

Testing

Run the tests by running any of the following commands.

npm test
npm run test:watch # watch mode

Build for production

Create a production build by running the following command.

npm run build

License

The MIT License (MIT)