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Learn how to efficiently manage events for each component generated from array results in React Native. Find the perfect solution for conditional rendering using the `useState` hook.
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How to Handle Events for Specific Components in React Native Using useState

React Native is an incredible framework for building mobile applications, and often developers encounter challenges when it comes to managing state and rendering components conditionally. In this guide, we will tackle a specific issue: handling events for individual components generated from an array of results. Let’s dive into the problem and explore an effective solution using the useState hook.

The Problem: Event Handling in a List

Imagine you have a functional component that generates a list of collapse headers from a JSON response. Each header corresponds to a category, and when you click on a header, you want to display specific information related to that category.

Here’s a brief overview of the scenario:

You use the .map function to create multiple components based on the JSON data.

Each component has a Touchable element that, when pressed, fetches specific data related to the clicked category.

The challenge arises when clicking a header causes all collapse bodies to render data from the last clicked header, rather than just the one that triggered the event.

What You Need to Achieve

You want to ensure that when you click on a specific header, only the corresponding body is displayed with the relevant data. This requires correctly managing the state associated with each header.

The Solution: Using useState for Conditional Rendering

Step 1: Initialize State Properly

Instead of using a single piece of state to store the fetched items, you can start by initializing it as an object. This allows you to store data associated with each header.

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

Step 2: Update State on Events

When you fetch the items based on the clicked category, store them as a property of the auditItems state object. Here’s how you can do this:

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

Step 3: Render Items Conditionally

To ensure that only the data related to the clicked header is rendered, check if the key exists in the auditItems object when rendering the component, like this:

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

Alternative Approach: Tracking Current Clicked Header

If you prefer a simpler solution and don’t need to store responses indefinitely, you can create an additional state to track the currently clicked header. For instance:

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

And instead of managing multiple states, render using currentId:

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

Conclusion

By utilizing the useState hook correctly, you can efficiently manage events for specific components in your React Native application. Whether you choose to maintain an object for all responses or simply track the currently clicked header, this approach allows your user interface to behave intuitively and as expected.

Feel free to implement these strategies in your projects to enhance the interactivity of your components!