Connecting Flask and JavaScript: Calling Python Functions on Button Click

Published: 24 July 2024
on channel: blogize

445

Summary: Learn how to call Python functions from JavaScript when a button is clicked using Flask, a micro web framework for Python.
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Connecting Flask and JavaScript: Calling Python Functions on Button Click

Flask is a micro web framework for Python, offering powerful tools for seamless web development. One common task in web applications is to call backend Python functions in response to frontend events, such as clicking a button. This process often requires integration between Flask for the backend and JavaScript for the frontend. Here, we will explore how to accomplish this.

Setting Up Flask

First, we need to set up a basic Flask application. If you haven't already installed Flask, you can do so using pip:

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

Next, create a Flask application:

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

In the above code:

We create a root route (/) that renders index.html.

We define another route (/call_function) that accepts POST requests and calls a Python function.

The your_python_function is a dummy function that doubles the value sent from the client.

Creating the HTML and JavaScript

The next step involves creating an HTML file with a button and some JavaScript code to handle the button click event:

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

In this HTML:

A button triggers the callPythonFunction JavaScript function on click.

The JavaScript function sends a POST request to the /call_function endpoint using the Fetch API.

The response from the server is handled to display the result in a div with the ID result.

Running the Application

After setting up the backend and frontend, you can run your Flask application by executing the following command:

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

Navigate to http://127.0.0.1:5000 in your web browser, click the button, and observe the console log and result displayed on the webpage.

Conclusion

Combining Flask for the backend with JavaScript for the frontend allows you to create dynamic web applications that can interact seamlessly. This basic example demonstrates how to call a Python function from a JavaScript button click event, paving the way for more complex interactions in your web projects.

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