ReactJS - React.Children.forEach - Can I get the child component name?

Question

I have a React (15.5.4) component with many children, some of which are HTML elements and some are other React components.

I\'m using server rendering and need the s

Answer 1

If you're using Babel, you can use this Babel plugin to automatically set the displayName, so that child.type.displayName will equal the string of whatever you've named the component:

https://www.npmjs.com/package/babel-plugin-add-react-displayname

It's easy to install and use, just read the directions and make sure to add the plugin name add-react-displayname to your plugins array in your .babelrc file.

Answer 2

You can set the component's name in the property displayName. If you're using ES6 classes, you can set a static property called displayName into component's class. Then, you'll be able to get the child name with child.type.displayName.

const FirstChild = ({ name }) => <li>{name}</li>;
FirstChild.displayName = 'FirstChild';

const SecondChild = ({ name }) => <li>{name}</li>;
SecondChild.displayName = 'SecondChild';

class ThirdChild extends React.Component {
  static displayName = 'ThirdChild';
  
  render() {
    return (
      <li>{this.props.name}</li>
    );
  }
  
}

class Parent extends React.Component {
  componentDidMount() {
    React.Children.forEach(this.props.children, child => {
      console.log('name =', child.type.displayName);
    })
  }
  
  render() {
    return (
      <ul>{this.props.children}</ul>
    );
  }
}

class App extends React.Component {
  render() {
    return (
      <Parent>
        <FirstChild name='1st child value' />
        <SecondChild name='2nd child value' />
        <ThirdChild name='3rd child value' />
      </Parent>
    );
  }
}


ReactDOM.render(<App />, document.getElementById("app"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="app"></div>

Answer 3

Use the es6 spread operator:

        React.Children.forEach(children, child => {
            const childType = { ...child.type }
            console.log('child', childType.displayName)
        })