Localization of Dates and Times with Flask-Moment

Previous post: Get started with Python Flask Framework on IBM Bluemix

Flask-Moment is an extension for Flask applications that integrates moment.js into Jinja2 templates. Flask-Moment is installed with pip

For locally:

$ pip install flask-moment

For Bluemix:

In requirements.txt add:
In hello.py: Initialize Flask-Moment
from flask_moment import Moment
moment= Moment(app)  
Add moment.js into base template base.html
In templates/base.html: Import moment.js library
{% block scripts %}
{{ super() }}
{{ moment.include_moment() }}
{% endblock %}  
To work with timestamps Flask-Moment makes a moment class available to templates. In hello.py passes a variable called current_time to the template for rendering.
In hello.py: Add a datetime variable.
from datetime import datetime
def index():
return render_template('index.html', current_time=datetime.utcnow())
Render current_time in the template.
In templates/index.html: Timestamp rendering with Flask-Moment
<p>The local date and time is {{ moment(current_time).format('LLL') }}.</p>
<p>That was {{ moment(current_time).fromNow(refresh=True) }}</p>  
The problem is that the can not be refresh because you render the index page. the current_time variable is defined in server, not in the browser. Another way to load local date and time and refresh it every second, is to use script snippet:
In the “index.html”:
<h3>Local time:<span id="timestamp"></span></h3>

<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!-- the script for refresh current time -->
var update = function () {
// using jQuery (really not a must):
$("#timestamp").html(moment().format('MMMM Do YYYY, h:mm:ss a'));
// or without jquery
document.getElementById("timestamp").innerHTML = moment().format('MMMM Do YYYY, h:mm:ss a');

setInterval(update, 100);
The result will be:

This work is based on the book named Flask Web Development


Popular posts from this blog

Final report for Open IoT Challenge 3.0

MQTT demo

OpenHab2 - MQTT binding demo