Get component name in React

Question

I'm developing a React application. I have a Loading component, which is a little animation for waiting. I want to add a message in this Loading component according to the component which called it.

Here is how i call my Loading component (with this.state.displayLoading at true or false) :

class LoginForm extends React.Component {
    render() {   
        return (
            <div className="login-form-root">
                 {this.state.displayLoading && <Loading loadingFrom={?}/>}
            </div>
        );
    }
}

I want to get "LoginForm" in my variable loadingFrom, which is the className. Maybe it's not the right way to do that.

Answer 1

Class Components

You can use this.constructor.name to obtain the name of your component.

(Using React 16.x as of this writing)

Caveat: This won't work if you're minifying for production with Webpack.

Functional Components

https://reactjs.org/docs/react-component.html#displayname

Answer 2

Every React.Component has a property called displayName that JSX sets automatically, so theoretically you can use that property

class LoginForm extends React.Component {
    render() {   
        return (
            <div className="login-form-root">
                {this.state.displayLoading && <Loading loadingFrom={this.displayName}/>}
            </div>
        );
    }
}

UPDATE (after multiple comments saying its not working)

As per convention, react offers a code snippet to wrap getting the component name on their documentation which is the following:

function withSubscription(WrappedComponent) {
  class WithSubscription extends React.Component {/* ... */}
  WithSubscription.displayName = `WithSubscription(${getDisplayName(WrappedComponent)})`;
  return WithSubscription;
}

function getDisplayName(WrappedComponent) {
  return WrappedComponent.displayName || WrappedComponent.name || 'Component';
}

As can be seen, they first check the display name, then the component name, and if all fails, then it will be just 'Component'