How to Run Python Scripts on Button Click in React

Published: 25 May 2025
on channel: vlogize

Discover how to effortlessly link your `React` app with a `Flask` backend to fetch data when a button is clicked.
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This video is based on the question https://stackoverflow.com/q/73926319/ asked by the user 'Harish' ( https://stackoverflow.com/u/20130448/ ) and on the answer https://stackoverflow.com/a/73927442/ provided by the user 'Gaëtan GR' ( https://stackoverflow.com/u/15023296/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Run Python Scripts on Button Click in React

Incorporating Python scripts into your React application may sound complex, but it doesn't have to be. If you're looking to fetch data from a Python script running on a Flask server when a button is clicked in your React app, you’re in the right place. This guide will guide you through the step-by-step process of achieving this integration.

Understanding the Problem

You have a Python file (.py) running with Flask on your local machine, and you want to trigger it from your React application to fetch data upon a button click. Your React app runs on http://localhost:3000, while your Flask server operates at http://localhost:5000/my_link. The objective is to set up a seamless interaction that allows you to display the data fetched from the Flask endpoint in your React app.

Setting Up the Flask Backend

Before diving into the React part, ensure your Flask backend is set up correctly. Below is a snippet of what your Flask code should look like:

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

Key Points:

Flask: It is the micro-framework that will serve your data.

CORS (Cross-Origin Resource Sharing): This is critical as React and Flask are running on different ports. It allows your React app to communicate with the Flask server.

Ensuring Your Flask API Works

Before proceeding to React, you should test your API endpoint to confirm it's returning the expected data:

Open your browser and navigate to http://localhost:5000/data.

You should see the response in JSON format. If not, ensure that your Flask code is correct and running properly.

Fetching data in React

Once you've confirmed that your Flask API works, you can set up your React application to fetch the data when the button is clicked. Below is a simple example of how you might structure your app.js file:

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

Explanation of Code:

State: You are using React’s useState hook to manage the state for name and password.

Event Handling: The onClickHandler function triggers when the button is clicked. It uses fetch to retrieve data from your Flask API.

Data Display: After fetching, the data is stored in state variables and displayed on the screen.

Key Takeaways

By following these steps, you have effectively set up a system where a button click in your React app triggers a Python Flask API call, fetching and displaying data from the backend seamlessly. Always ensure that:

Your Flask server is running smoothly.

You are correctly managing CORS to allow for cross-domain requests.

You handle any errors appropriately to avoid crashing your app.

With the foundational understanding of APIs, the fetch library, and React state management, you're now equipped to enhance your applications with robust backend interaction. Happy coding!

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