JSFiddle - React, Tailwind, and code Playground

http://stackoverflow.com/questions/23028447/how-to-toggle-class-in-the-nested-component-in-reactjs/23032933#23032933

by BinaryMuse

HTML

<script src="http://fb.me/JSXTransformer-0.10.0.js"></script>
<script src="http://fb.me/react-with-addons-0.10.0.js"></script>
<script src="http://fb.me/react-js-fiddle-integration.js"></script>

CSS

.question-a-container { color: red; }
.question-b-container { color: blue; }
.active { font-weight: bold; }

JavaScript 1.7

/** @jsx React.DOM */

var QuestionA = React.createClass({
  render: function() {
    return <section className={this.props.className + " question-a-container"}>Section A</section>;
  }
});

var QuestionB = React.createClass({
  render: function() {
    return <section className={this.props.className + " question-b-container"}>Section B</section>;
  }
});

var Root = React.createClass({
  getInitialState: function() {
    return { question: 'a' };
  },

  render: function() {
    var qAclassName = this.state.question === 'a' ? 'active' : '';
    var qBclassName = this.state.question === 'b' ? 'active' : '';
    return (
      <div className="question">      
        <QuestionA className={qAclassName} />
        <QuestionB className={qBclassName} />
        <div className="question-side-switcher" onClick={this.handleSideChanging}>Change</div>
      </div>
    );
  },

  handleSideChanging: function() {
    this.setState({question: this.state.question === 'a' ? 'b' : 'a' });
  }
});
 
React.renderComponent(<Root />, document.body);