gistfile1.txt

class A extends React.Component{
    state = {
        scrollToDefinitionID :1
    },

    stepUP(){
        this.setState({
            currentStep : 2
        })
    }

    render(){
        return (
            <Child onClick={ this.stepUP }></Child>
            <Child currentDefinition={ this.state.scrollToDefinitionID }></Child>
        );
    }
}