javascript - 如何向ReactJS组件添加多个类(How to add multiple classes to a ReactJS Component)

Question

I am new to ReactJS and JSX and I am having a little problem with the code below.

(我是ReactJS和JSX的新手，下面的代码有一些问题。)

I am trying to add multiple classes to the className attribute on each li :

(我正在尝试向每个li的className属性添加多个类：)

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

My React component is:

(我的React组件是：)

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"));

  ask by Hector translate from so

Answer 1

I use ES6 template literals .

(我使用ES6 模板文字 。)

For example:

(例如：)

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

And then just render it:

(然后渲染它：)

<input className={classes} />

One-liner version:

(一线版：)

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