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Learn how to effectively `re-render` components in ReactJS when using hooks. Discover a clean approach by lifting state up and connecting components seamlessly.
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ReactJS Hooks: How to Re-render One Component from Another

In the world of ReactJS development, managing state and ensuring that components re-render correctly is crucial for creating dynamic and interactive applications. One common challenge developers face is needing to re-render components based on changes that happen in a different component. For example, you might want to change the layout of a sidebar based on a selection made in the header. This can lead to issues, such as those experienced with the error message: "Can't perform a React state update on an unmounted component." In this guide, we'll discuss a clean solution to this problem by leveraging the concept of "lifting state up."

Understanding the Problem

Let's consider a scenario with three components:

MainComponent: The parent component that houses the two child components.

WebHeaderComponent: This component contains a selection input, allowing the user to choose a role.

SideMenuComponent: The sidebar that needs to be updated when the selection in the header changes.

The goal is straightforward: when a user changes the selection in WebHeaderComponent, the SideMenuComponent should reflect this change and update accordingly. If both components try to manage their own versions of the data independently, we can run into issues where one component is not aware of updates made in another, leading to potential memory leaks and errors.

The Solution: Lifting State Up

To tackle this issue effectively, we can use the strategy of lifting state up. This involves moving the shared state to the common ancestor of the components that need to know about the data changes. Here’s how you can implement this strategy:

Step 1: Move the State to the Parent Component

Instead of each child component managing its own state, we’ll keep the state in the MainComponent. This allows both the WebHeaderComponent and the SideMenuComponent to access the same state, ensuring they are always in sync.

Here is an example structure:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update the Header Component

In the WebHeaderComponent, you'll utilize the prop passed down from the MainComponent to update the shared state when the role is changed.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Update the Sidebar Component

In the SideMenuComponent, you'll also receive the shared state as a prop, allowing the sidebar to react to changes made in the header.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With this approach of lifting state up, you've created a relationship between the components that makes it simple for them to communicate. Changes in the WebHeaderComponent will seamlessly update the SideMenuComponent, thus maintaining a clean and efficient state management practice in your React application.

While you might encounter other issues as you work with React hooks, understanding how to structure your components and manage state between them is a fundamental skill that will help you avoid common pitfalls like memory leaks. Happy coding!