[javascript] ReactJS 컴포넌트에 여러 클래스를 추가하는 방법

ReactJS와 JSX를 처음 사용하고 아래 코드에 약간의 문제가 있습니다.

className각 속성에 여러 클래스를 추가하려고합니다 li.

<li key={index} className={activeClass, data.class, "main-class"}></li>

내 반응 구성 요소는 다음과 같습니다

var AccountMainMenu = React.createClass({
  getInitialState: function() {
    return { focused: 0 };
  },

  clicked: function(index) {
    this.setState({ focused: index });
  },

  render: function() {
    var self = this;
    var accountMenuData = [
      {
        name: "My Account",
        icon: "icon-account"
      },
      {
        name: "Messages",
        icon: "icon-message"
      },
      {
        name: "Settings",
        icon: "icon-settings"
      }
    /*{
        name:"Help &amp; Support &nbsp; <span class='font-awesome icon-support'></span>(888) 664.6261",
        listClass:"no-mobile last help-support last"
      }*/
    ];

    return (
      <div className="acc-header-wrapper clearfix">
        <ul className="acc-btns-container">
          {accountMenuData.map(function(data, index) {
            var activeClass = "";

            if (self.state.focused == index) {
              activeClass = "active";
            }

            return (
              <li
                key={index}
                className={activeClass}
                onClick={self.clicked.bind(self, index)}
              >
                <a href="#" className={data.icon}>
                  {data.name}
                </a>
              </li>
            );
          })}
        </ul>
      </div>
    );
  }
});

ReactDOM.render(<AccountMainMenu />, document.getElementById("app-container"));

답변

...
    var liClasses = classNames({
      'main-class': true,
      'activeClass': self.state.focused === index
    });

    return (<li className={liClasses}>{data.name}</li>);
...

const error = this.state.valid ? '' : 'error'
const classes = `form-control round-lg ${error}`

<input className={classes} />

<input className={`form-control round-lg ${this.state.valid ? '' : 'error'}`} />

<li className={[activeClass, data.klass, "main-class"].join(' ')} />

function classNames(classes) {
  return Object.entries(classes)
    .filter(([key, value]) => value)
    .map(([key, value]) => key)
    .join(' ');
}

const classes = {
  'maybeClass': true,
  'otherClass': true,
  'probablyNotClass': false,
};

const myClassNames = classNames(classes);
// Output: "maybeClass otherClass"

<li className={myClassNames} />

const isEnabled = true;
const isChecked = false;

<li className={[isEnabled && 'enabled', isChecked && 'checked']
  .filter(e => !!e)
  .join(' ')
} />
// Output:
// <li className={'enabled'} />

import style from '/css/style.css';

<div className={style.style1+ ' ' + style.style2} />

<div class="src-client-css-pages-style1-selectionItem src-client-css-pages-style2">

const class1 = doIHaveSomething ? style.style1 : 'backupClass';

<div className={class1 + ' ' + style.style2} />

<input className={`class1 ${class2}`}>

<li className="class1 class2 class3">foo</li>

var myClassNammes = 'class1 class2 class3';
...
<li className={myClassNames}>foo</li>

className = {`
      text-right
      ${itemId === activeItemId ? 'active' : ''}
      ${anotherProperty === true ? 'class1' : 'class2'}
`}