Search⌘ K
AI Features
Home
Courses
Advanced React Patterns With Hooks

Handling State Change Callbacks

Explore how to handle state change callbacks in React functional components by using hooks like useEffect. Understand common pitfalls such as unwanted callback invocation on component mount and why straightforward solutions fail. This lesson prepares you to implement reusable components that trigger user-defined logic only after relevant state updates.

We'll cover the following...

Triggering Callbacks Upon State Change

Let’s borrow a concept from your experience with React’s class components. If you remember, it’s possible to do this with class components:

Javascript (babel-node)
this.setState({
  name: "value"
}, () => {
  this.props.onStateChange(this.state.name)
})

If you don’t have experience with class components, this is how you trigger a callback after a state change in class components.

Usually, the callback, e.g., this.props.onStateChange on line 4, is always invoked with the current value of the updated state as shown below:

Javascript (babel-node)
this.props.onStateChange(this.state.name)

Why is this important? This is good practice for ...