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199 lines
6.8 KiB
Markdown
199 lines
6.8 KiB
Markdown
Classnames
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===========
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[](https://www.npmjs.com/package/classnames)
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[](https://travis-ci.org/JedWatson/classnames)
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[](https://www.npmjs.com/package/classnames)
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[](https://www.npmjs.com/package/classnames)
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[](https://thinkmill.com.au/?utm_source=github&utm_medium=badge&utm_campaign=classnames)
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A simple JavaScript utility for conditionally joining classNames together.
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Install with [npm](https://www.npmjs.com/), [Bower](https://bower.io/), or [Yarn](https://yarnpkg.com/):
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```bash
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# via npm
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npm install classnames
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# via Bower
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bower install classnames
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# or Yarn (note that it will automatically save the package to your `dependencies` in `package.json`)
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yarn add classnames
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```
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Use with [Node.js](https://nodejs.org/en/), [Browserify](https://browserify.org/), or [webpack](https://webpack.github.io/):
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```js
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var classNames = require('classnames');
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classNames('foo', 'bar'); // => 'foo bar'
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```
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Alternatively, you can simply include `index.js` on your page with a standalone `<script>` tag and it will export a global `classNames` method, or define the module if you are using RequireJS.
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### Project philosophy
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We take the stability and performance of this package seriously, because it is run millions of times a day in browsers all around the world. Updates are thoroughly reviewed for performance impacts before being released, and we have a comprehensive test suite.
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Classnames follows the [SemVer](https://semver.org/) standard for versioning.
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There is also a [Changelog](https://github.com/JedWatson/classnames/blob/master/HISTORY.md).
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## Usage
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The `classNames` function takes any number of arguments which can be a string or object.
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The argument `'foo'` is short for `{ foo: true }`. If the value associated with a given key is falsy, that key won't be included in the output.
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```js
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classNames('foo', 'bar'); // => 'foo bar'
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classNames('foo', { bar: true }); // => 'foo bar'
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classNames({ 'foo-bar': true }); // => 'foo-bar'
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classNames({ 'foo-bar': false }); // => ''
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classNames({ foo: true }, { bar: true }); // => 'foo bar'
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classNames({ foo: true, bar: true }); // => 'foo bar'
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// lots of arguments of various types
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classNames('foo', { bar: true, duck: false }, 'baz', { quux: true }); // => 'foo bar baz quux'
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// other falsy values are just ignored
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classNames(null, false, 'bar', undefined, 0, 1, { baz: null }, ''); // => 'bar 1'
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```
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Arrays will be recursively flattened as per the rules above:
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```js
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var arr = ['b', { c: true, d: false }];
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classNames('a', arr); // => 'a b c'
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```
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### Dynamic class names with ES2015
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If you're in an environment that supports [computed keys](https://www.ecma-international.org/ecma-262/6.0/#sec-object-initializer) (available in ES2015 and Babel) you can use dynamic class names:
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```js
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let buttonType = 'primary';
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classNames({ [`btn-${buttonType}`]: true });
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```
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### Usage with React.js
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This package is the official replacement for `classSet`, which was originally shipped in the React.js Addons bundle.
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One of its primary use cases is to make dynamic and conditional `className` props simpler to work with (especially more so than conditional string manipulation). So where you may have the following code to generate a `className` prop for a `<button>` in React:
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```js
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class Button extends React.Component {
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// ...
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render () {
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var btnClass = 'btn';
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if (this.state.isPressed) btnClass += ' btn-pressed';
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else if (this.state.isHovered) btnClass += ' btn-over';
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return <button className={btnClass}>{this.props.label}</button>;
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}
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}
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```
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You can express the conditional classes more simply as an object:
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```js
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var classNames = require('classnames');
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class Button extends React.Component {
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// ...
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render () {
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var btnClass = classNames({
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btn: true,
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'btn-pressed': this.state.isPressed,
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'btn-over': !this.state.isPressed && this.state.isHovered
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});
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return <button className={btnClass}>{this.props.label}</button>;
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}
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}
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```
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Because you can mix together object, array and string arguments, supporting optional `className` props is also simpler as only truthy arguments get included in the result:
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```js
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var btnClass = classNames('btn', this.props.className, {
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'btn-pressed': this.state.isPressed,
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'btn-over': !this.state.isPressed && this.state.isHovered
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});
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```
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### Alternate `dedupe` version
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There is an alternate version of `classNames` available which correctly dedupes classes and ensures that falsy classes specified in later arguments are excluded from the result set.
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This version is slower (about 5x) so it is offered as an opt-in.
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To use the dedupe version with Node.js, Browserify, or webpack:
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```js
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var classNames = require('classnames/dedupe');
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classNames('foo', 'foo', 'bar'); // => 'foo bar'
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classNames('foo', { foo: false, bar: true }); // => 'bar'
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```
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For standalone (global / AMD) use, include `dedupe.js` in a `<script>` tag on your page.
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### Alternate `bind` version (for [css-modules](https://github.com/css-modules/css-modules))
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If you are using [css-modules](https://github.com/css-modules/css-modules), or a similar approach to abstract class "names" and the real `className` values that are actually output to the DOM, you may want to use the `bind` variant.
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_Note that in ES2015 environments, it may be better to use the "dynamic class names" approach documented above._
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```js
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var classNames = require('classnames/bind');
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var styles = {
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foo: 'abc',
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bar: 'def',
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baz: 'xyz'
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};
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var cx = classNames.bind(styles);
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var className = cx('foo', ['bar'], { baz: true }); // => "abc def xyz"
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```
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Real-world example:
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```js
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/* components/submit-button.js */
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import { Component } from 'react';
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import classNames from 'classnames/bind';
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import styles from './submit-button.css';
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let cx = classNames.bind(styles);
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export default class SubmitButton extends Component {
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render () {
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let text = this.props.store.submissionInProgress ? 'Processing...' : 'Submit';
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let className = cx({
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base: true,
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inProgress: this.props.store.submissionInProgress,
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error: this.props.store.errorOccurred,
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disabled: this.props.form.valid,
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});
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return <button className={className}>{text}</button>;
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}
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};
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```
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## Polyfills needed to support older browsers
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#### `classNames >=2.0.0`
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`Array.isArray`: see [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray) for details about unsupported older browsers (e.g. <= IE8) and a simple polyfill.
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## LICENSE [MIT](LICENSE)
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Copyright (c) 2018 Jed Watson.
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Copyright of the Typescript bindings are respective of each contributor listed in the definition file.
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