How Can I Update a Parent Component's State from a Nested Child Component in React without Using Redux?

Updating a Parent's State in React without Redux

Many developers encounter the challenge of communicating state between nested components. A common scenario arises when a child component needs to update the state of a higher-level parent component. This becomes problematic since React dictates that props are immutable.

Consider the following component structure:

Component 1
  - Component 2
    - Component 4
      - Component 5
Component 3

In this scenario, Component 3 requires access to state stored in Component 5. It may seem intuitive to pass the state of Component 5 as a prop to Component 1 and forward it to the other components. However, React's immutability rules prohibit this approach.

One solution to this problem is to implement child-parent communication using a function provided by the parent component. Consider the following code snippet:

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}/>
  }
}

In this example, the handler function provided by the Parent component is passed to the Child component as a prop. When the button in the Child component is clicked, it invokes the handler function, updating the state of the Parent component.

It's important to note that this solution requires restructuring the component hierarchy to ensure logical relationships between components. In the given example, Component 5 and Component 3 may not be directly related. Therefore, it may be necessary to create a new component that encompasses them, allowing for the state to be managed effectively.

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