How to Dynamically Update Lists in Jinja2 Templates Using FastAPI?

How to get the updated list of items in Jinja2 template using FastAPI?

When using Jinja2 templating with FastAPI, handling real-time events and updating the template with the latest data can be a challenge. One such scenario is updating a list of items on the frontend based on user actions, such as adding or removing comments on a blog.

To address this, a common approach is to employ WebSockets, which establish a persistent connection between the client and the server, allowing for bi-directional communication. This enables React and other frontend frameworks to efficiently handle real-time updates.

To demonstrate the implementation, we'll create a simple FastAPI application that handles WebSocket connections and uses Jinja2 to render the updated list of comments.

Here's an example code to implement the functionality:

app.py

This file contains the FastAPI application, defines a WebSocket endpoint, and handles the WebSocket connections.

templates/index.html

This is the Jinja2 template that displays the list of comments and provides a form for adding new comments. The JavaScript code in this template uses the WebSocket connection to send new comments to the server and receive updates about newly added comments, which are then dynamically rendered in the template.

By combining these components, you can now dynamically update the list of comments in your Jinja2 template in response to user actions, providing a more interactive and real-time user experience.

The above is the detailed content of How to Dynamically Update Lists in Jinja2 Templates Using FastAPI?. For more information, please follow other related articles on the PHP Chinese website!