How can I update the parent’s state in React?

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For child-parent communication you should pass a function setting the state from parent to child, like this


class Parent extends React.Component {
  constructor(props) {
    super(props)

    this.handler = this.handler.bind(this)
  }

  handler() {
    this.setState({
      someVar: 'some value'
    })
  }

  render() {
    return <Child handler = {this.handler} />
  }
}

class Child extends React.Component {
  render() {
    return <Button onClick = {this.props.handler}/ >
  }
}

This way the child can update the parent’s state with the call of a function passed with props.

But you will have to rethink your components’ structure, because as I understand components 5 and 3 are not related.

One possible solution is to wrap them in a higher level component which will contain the state of both component 1 and 3. This component will set the lower level state through props.

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