When you're building your React components, you'll probably want to access child properties of the markup. Parent can read its children by accessing the special this.props.children prop. this.props.children is an opaque data structure: use

When you're building your React components, you'll probably want to access child properties of the markup.

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Parent?can read its children by accessing the special?this.props.children?prop.this.props.children?is an opaque data structure:?use the?React.Children utilities?to manipulate them.

https://facebook.github.io/react/docs/multiple-components.html

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this.props.children undefined

You can't access the children of your component through?this.props.children.this.props.children?designates the children being?passed onto you?by the owner.

https://facebook.github.io/react/tips/children-undefined.html

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Type of the Children props

Usually, a component's children (this.props.children) is an array of components.?However, when there is only a single child,?this.props.children?will be the single child component itself?without the array wrapper. This saves an array allocation.

https://facebook.github.io/react/tips/children-props-type.html

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    <meta charset="UTF-8">
    <title>React Lesson 6: Accessing Child Properties</title>
    <link rel="stylesheet" href="../bower_components/bootstrap/dist/css/bootstrap.min.css">



<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.12.2/react.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.12.2/JSXTransformer.js"></script>
<script type="text/jsx">
    <span>/*<span>* @jsx React.DOM <span>*/

    <span>var App =<span> React.createClass({
        render: <span>function<span>(){
            <span>return<span> (
                    <BButton>I <BHeart> React<span>
            );
        }
    });

    <span>var BButton =<span> React.createClass({
       render: <span>function<span>() {
           <span>return<span> (
             <a className="btn btn-primary">{<span>this.props.children}
<span>           );
       }
    });

    <span>var BHeart =<span>
            React.createClass({
                render:<span>function<span>(){
                    <span>return <span className="glyphicon glyphicon-heart">
<span>                }
            });


    React.render(<App />, document.body);
</script>

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App has two children BButton and BHeart, all thoes chilren come thought from {this.props.children}.

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If you don't have {this.props.children}:

    <span>var</span> BButton =<span> React.createClass({
       render: </span><span>function</span><span>() {
           </span><span>return</span><span> (
             </span><a classname="btn btn-primary">No passed <span>in</span>!</a>
<span>           );
       }
    });</span>

We end up with this:?

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[Notice:] Just remeber when give class to the render elements, we need to use 'className' not 'class'.