Simple react context example

react-context.js

class Parent extends Component {
    getChildContext() {
        return {componentID: "123456"};
    }
    render() {
        return <Child1 />
    }
}

Parent.childContextTypes = {
    componentID: React.PropTypes.string
};

class Child1 extends Component {

    render() {
        return <Child2 />
    }
}

class Child2 extends Component {

    render() {
        return <div>{this.context.componentID}</div>
    }
}

Child2.contextTypes = {
    componentID: React.PropTypes.string
};