Скачать или смотреть How to Use OnClick to Fetch API Data in React Native

Learn how to create a React Native app that uses a button click to generate a random number and fetch data from an API efficiently.
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Handling API Data Fetching on Button Click in React Native

React Native is an excellent framework for building mobile applications, but as a beginner, you may run into challenges while integrating features. One common task is fetching data from an API when a button is clicked. In this guide, we will guide you through the process of generating a random number, using it to modify an API URL, and handling the fetching of data seamlessly in React Native.

The Problem

If you’re new to React Native, the task of generating a random number using a button click and then using that number to fetch data from an API can seem daunting. Essentially, you want to:

Generate a random number when a button is clicked.

Use this number as an ID appended to an API URL to fetch corresponding data.

To get started, you will need two snippets of code: one for generating the random number and another for fetching data from the API.

The Solution Structure

To solve this problem, we will consolidate both functionalities into a single component. Below are the steps we will take:

Step 1: Generate a Random Number

First, define a function to generate a random number within a specified range. In this case, we will generate a number between 1 and 5000. This function will be triggered when the button is clicked.

Step 2: Fetch Data from the API

Next, we will create an asynchronous function that fetches data from the API using the random number generated in step 1.

Step 3: Render the UI

Finally, we will design the user interface to include a button to trigger the random number generation and a display area for the fetched data.

Implementation in React Native

Below is the complete implementation combining both functionalities.

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

Explanation of the Code

Import Statements: Here we include necessary components and libraries.

State Management: We use the useState hook to manage data states (data, number, and visible).

Random Number Generation: The generateRandomNumber function generates a random number between 1 and 5000.

Data Fetching: The fetchData function constructs the API URL using the generated random number, fetches the data, and updates the component states accordingly.

UI Rendering: The button is rendered to trigger the fetch action, and a FlatList displays the fetched data.

Conclusion

Combining random number generation and data fetching in a single React Native component is straightforward. By encapsulating the logic into functions and managing the state seamlessly, you can create a smooth user experience. This practice gives you a solid foundation in working with API calls and user interactions in React Native.

Feel free to try this code in your React Native project, and don't hesitate to reach out if you have any questions!