React - Get the component name in functional components - reactjs

Question

I want on every component in my app to add attribute component-name="componentX". I don't want to do it hard coded when creating a component but to find a generic way to find the component name and set it in the attribute.
I know there is the displayName property but it's only for class component.
I have a lot of functional components. How can I achieve it?
Thanks!

Answer 1

If you wrap children you can access the child.type.name to get the component / function name.
Here is a small example:
class LogNames extends React.Component {
render() {
const { children } = this.props;
React.Children.forEach(children,child =>{
console.log(child.type.name)
});
return children;
}
}
class Child extends React.Component {
render() {
return <div>A Child</div>
}
}
const Child2 = () => <div>Child 2</div>
class App extends React.Component {
render() {
return (
<div>
<LogNames>
<Child/>
</LogNames>
<LogNames>
<Child2 />
</LogNames>
</div>
);
}
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
<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="root" />
Just noticed you want to set an attribute on the DOM as well, so i added another example that does just that (open devtools to see the attributes):
class WithNameAttr extends React.Component {
componentDidMount(){
const {children} = this.props;
// get a ref to the current node
const node = ReactDOM.findDOMNode(this);
// force and return a signle child
const child = React.Children.only(children);
// set name attribute (if available)
const name = child.type.name;
name && node.setAttribute('component-name', name);
}
render() {
return this.props.children;
}
}
class Child extends React.Component {
render() {
return <div>A Child</div>
}
}
const Child2 = () => <div>Child 2</div>
class App extends React.Component {
render() {
return (
<div>
<WithNameAttr>
<Child />
</WithNameAttr>
<WithNameAttr>
<Child2 />
</WithNameAttr>
<WithNameAttr>
<div>dom elemetns doesnt have names</div>
</WithNameAttr>
</div>
);
}
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
<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="root"/>