react动态添加样式

1、使用ES6模版字符串

className={`title ${index === this.state.active ? 'active' : ''}`}

2、classnames库的使用

安装：css

npm install classnames --save

使用：react

import classNames from 'classnames';

<div className=classNames({
    'class1': true,
    'class2': true
    )>
</div>

能够将后面的true省略，能够对传入的class进行比较明显的动态判断。git

其余用法：github

classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', { bar: true }); // => 'foo bar'
classNames({ 'foo-bar': true }); // => 'foo-bar'
classNames({ 'foo-bar': false }); // => ''
classNames({ foo: true }, { bar: true }); // => 'foo bar'
classNames({ foo: true, bar: true }); // => 'foo bar'

// lots of arguments of various types
classNames('foo', { bar: true, duck: false }, 'baz', { quux: true }); // => 'foo bar baz quux'

// other falsy values are just ignored
classNames(null, false, 'bar', undefined, 0, 1, { baz: null }, ''); // => 'bar 1'

也能够传入数组对象：web

var arr = ['b', { c: true, d: false }];
classNames('a', arr); // => 'a b c'

能够传入动态class：npm

let buttonType = 'primary';
classNames({ [`btn-${buttonType}`]: true });

在react中能够直接在classname内部传入动态class并进行条件判断，segmentfault

var classNames = require('classnames');

var Button = React.createClass({
  // ...
  render () {
    var btnClass = classNames({
      btn: true,
      'btn-pressed': this.state.isPressed,
      'btn-over': !this.state.isPressed && this.state.isHovered
    });
    return <button className={btnClass}>{this.props.label}</button>;
  }
});

3、CSS Modules + React + classnames

import classNames from 'classnames';
import styles from './dialog.css';

export default class Dialog extends React.Component {
  render() {
    const cx = classNames({
      [styles.confirm]: !this.state.disabled,
      [styles.disabledConfirm]: this.state.disabled
    });

    return <div className={styles.root}>
      <a className={cx}>Confirm</a>
      ...
    </div>
  }
}

参考连接：

gitlab库： https://github.com/JedWatson/classnames
http://www.noobyard.com/article/p-vyidcqpo-g.html
http://www.noobyard.com/article/p-aozyhmgl-cu.html数组