Flask is a versatile web framework for Python, and AJAX (Asynchronous JavaScript and XML) is a technology that enables dynamic, asynchronous communication between a web server and a client browser. In this guide, we'll explore how to combine Flask and AJAX to achieve dynamic page updates. This allows you to load new data or content on a web page without requiring a full page reload. By following this guide, you'll learn how to implement dynamic updates using Flask and AJAX for a more responsive and interactive web application.

Step 1: Setting Up Your Flask Application

Start by setting up your Flask application and creating a directory structure. Here's a sample structure:


Step 2: Installing Flask

Install Flask, the Python web framework, using pip:

pip install Flask

Step 3: Creating the Flask Application

Create your Flask application. Here's an example of Python code:

from flask import Flask, render_template, request, jsonify
app = Flask(__name__)
def index():
return render_template('index.html')
@app.route('/load_data', methods=['GET'])
def load_data():
# Simulate loading data from a database or external source
data = ['Item 1', 'Item 2', 'Item 3']
return jsonify(data=data)
if __name__ == '__main__':

Step 4: Creating the HTML Template

Create an HTML template for the index page. This page will display data loaded dynamically using AJAX. Here's an example:

<!-- templates/index.html -->
<!DOCTYPE html>
<title>Dynamic Page Updates</title>
<script src=""></script>
<h1>Dynamic Page Updates</h1>
<button id="load-button">Load Data</button>
<ul id="data-list"></ul>
$(document).ready(function() {
$('#load-button').click(function() {
url: '/load_data',
type: 'GET',
success: function(response) {
var dataList = $('#data-list');
dataList.empty(); {
dataList.append('<li>' + item + '</li>');
error: function(error) {


Combining Flask with AJAX enables dynamic page updates, providing a more interactive and responsive user experience on your web application. By following this guide, you've learned how to set up a Flask application, create an HTML template for dynamic updates, and use AJAX to load data asynchronously. You can expand on this foundation to implement real-time updates, live search, and other interactive features.