How to Render an Array with onClick Buttons in ReactJS

Discover how to effectively render an array as a list with interactive buttons in ReactJS, enhancing your UI and state management skills in class components.
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How to Render an Array with onClick Buttons in ReactJS

If you're new to ReactJS development, you might encounter challenges rendering lists from data received through GraphQL queries. One common scenario involves creating interactive buttons that, when clicked, filter and display corresponding data. In this guide, we will explore how to achieve this by building an engaging UI that effectively utilizes React's state management.

The Problem

You've created buttons that need to filter and display products based on their categories. However, despite your attempts, the implementation isn't functioning as expected. The issue might stem from incorrect state updates, rendering logic, or even misunderstanding how React's component lifecycle works.

Let's break down the solution with improved code practices and an explanation of key concepts.

Step-by-Step Solution

1. Understanding State Management

In React, state is managed asynchronously. This means that when you use setState to update the component's state, the previous state might be logged instead of the updated one. This can be misleading if you try to immediately console log the state right after calling setState.

2. Implementing Component Lifecycle Methods

The key method you want to utilize here is componentDidUpdate, which allows for operations after the component has re-rendered. This is useful for actions that depend on state changes.

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

3. Correctly Setting State with setState

When updating the state, ensure you are spreading the existing state before making changes. This prevents overwriting previous state values unintentionally. Here’s an improved way to update the state:

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

4. Using Callbacks for State Updates

Sometimes you want to execute some code right after the state has been updated. You can pass a callback to setState which will run after the state update:

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

5. Refactoring Your Component

With these practices in mind, we can refactor your ProductListing class component more effectively.

Here’s a shortened example that encapsulates the best practices discussed above:

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

Final Thoughts

By following the outlined principles—better state management, utilizing lifecycle methods, and correctly spreading the state—you can build a responsive and interactive ReactJS component that handles button clicks effectively to filter and render lists.

These coding practices will not only resolve your current issues, but they will also enhance your overall ReactJS skills as you continue your development journey.