React - Components Using Javascript

I am trying to figure out how to respond to the warning in react to use javascript classes to create components in my MERN app. The warning says: Warning: Accessing createClass via

Solution 1:

You should use ES6 class for make a React component.

import React from 'react';

class App extends from React.Component{
    constructor(props){
        super(props);
        this.sample = this.sample.bind(this);
        // initialize your methods, states here
    }

    // if you want life cycle methods and methods define here

    componentWillMount(nextProps, nextState){
        console.log('componentWillMount');
    }

    sample(){
        console.log('sample');
    }

    render(){
        return <div onClick={this.sample}>Hello World!</div>
    }
}

Solution 2:

This is what I would do to create a class in React:

import React, { Component } from 'react';

class GreeterForm extends Component {
    onFormSubmit = (e) => {
        e.preventDefault();
        //do stuff
    }
    render() {
        return (<Child onFormSubmit={this.onFormSubmit} />)
    }
}