11 KiB
Home
What is Django LiveView?
Django LiveView is a framework for creating Realtime SPAs using HTML over the Wire technology. It is inspired by Phoenix LiveView and it is built on top of Django Channels.
It allows you to create interactive web applications using only HTML, CSS and Python. JavaScript ONLY is used to capture events, send and receive strings over a WebSockets channel.
What are your superpowers?
- Create SPAs without using APIs.
- Uses Django's template system to render the frontend (Without JavaScript).
- The logic is not split between the backend and the frontend, it all stays in Python.
- You can still use all of Django's native tools, such as its ORM, forms, plugins, etc.
- Everything is asynchronous by default.
- Don't learn anything new. If you know Python, you know how to use Django LiveView.
- All in real time.
Now you can create SPAs without using APIs, without JavaScript, and without learning anything new. If you know Python, you know how to use Django LiveView.
Are you ready to create your first Realtime SPA? Let's go to the Quickstart.
Quickstart
Welcome to the Quickstart guide. Here you will learn how to create your first Realtime SPA using Django LiveView. I assume you have a basic understanding of Django and Python.
All the steps are applied in a minimalist template.
1. Install Django
Install Django, create a project and an app.
2. Install LiveView
Install django-liveview with pip.
pip install django-liveview3. Modify the configuration
Add liveview to your installed INSTALLED_APPS.
INSTALLED_APPS = [
"daphne",
"channels",
"liveview",
]Then indicate in which previously created App you want to implement LiveView.
LIVEVIEW_APPS = ["website"]4. Migration
Execute the migrations so that the LiveView tables are generated.
python manage.py migrate5. ASGI
Modify the ASGI file, asgi.py to add the LiveView routing. In this example it is assumed that settings.py is inside core, in your case it may be different.
import os
import django
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "core.settings")
django.setup()
from channels.auth import AuthMiddlewareStack
from django.core.asgi import get_asgi_application
from channels.security.websocket import AllowedHostsOriginValidator
from channels.routing import ProtocolTypeRouter, URLRouter
from django.urls import re_path
from liveview.consumers import LiveViewConsumer
application = ProtocolTypeRouter(
{
# Django's ASGI application to handle traditional HTTP requests
"http": get_asgi_application(),
# WebSocket handler
"websocket": AuthMiddlewareStack(
AllowedHostsOriginValidator(
URLRouter([re_path(r"^ws/liveview/$", LiveViewConsumer.as_asgi())])
)
),
}
)6. Create your first Action
Place where the functions and logic of the business logic are stored. We will start by creating an action to generate a random number and print it.
Create inside your App a folder called actions, here will go all the actions for each page. Now we will create inside the folder a file named home.py.
# my-app/actions/home.py
from liveview.context_processors import get_global_context
from core import settings
from liveview.utils import (
get_html,
update_active_nav,
enable_lang,
loading,
)
from channels.db import database_sync_to_async
from django.templatetags.static import static
from django.urls import reverse
from django.utils.translation import gettext as _
from random import randint
template = "pages/home.html"
# Database
# Functions
async def get_context(consumer=None):
context = get_global_context(consumer=consumer)
# Update context
context.update(
{
"url": settings.DOMAIN_URL + reverse("home"),
"title": _("Home") + " | Home",
"meta": {
"description": _("Home page of the website"),
"image": f"{settings.DOMAIN_URL}{static('img/seo/og-image.jpg')}",
},
"active_nav": "home",
"page": template,
}
)
return context
@enable_lang
@loading
async def send_page(consumer, client_data, lang=None):
# Nav
await update_active_nav(consumer, "home")
# Main
my_context = await get_context(consumer=consumer)
html = await get_html(template, my_context)
data = {
"action": client_data["action"],
"selector": "#main",
"html": html,
}
data.update(my_context)
await consumer.send_html(data)
async def random_number(consumer, client_data, lang=None):
my_context = await get_context(consumer=consumer)
data = {
"action": client_data["action"],
"selector": "#output-random-number",
"html": randint(0, 10),
}
data.update(my_context)
await consumer.send_html(data)There are several points in the above code to keep in mind.
templateis the name of the template that will be rendered.get_context()is a function that returns a dictionary with the context of the page.send_page()is the function that will be executed when the page is loaded.random_number()is the function that will be executed when the button is clicked.
7. Create the base template
Now we will create the base template, which will be the one that will be rendered when the page is loaded.
Create a folder called templates, or use your template folder, inside your App and inside it create another folder called layouts. Now create a file called base.html.
{# my-app/templates/layouts/base.html #}
{% load static i18n %}
<!doctype html>{% get_current_language as CURRENT_LANGUAGE %}
<html lang="{{ CURRENT_LANGUAGE }}">
<head>
<meta charset="utf-8">
<title>{{ title }}</title>
<meta
name="viewport"
content="width=device-width, initial-scale=1.0, shrink-to-fit=no"
>
<meta
name="description"
content="{{ meta.description }}"
>
<meta
property="og:image"
content="{{ meta.image }}"
>
<script type="module" src="{% static 'js/main.js' %}" defer></script>
</head>
<body
data-host="{{ request.get_host }}"
data-debug="{{ DEBUG }}"
>
<section id="loading"></section>
<section id="notifications" class="notifications"></section>
<section id="no_connection"></section>
<div class="container">
<header id="content-header">
{% include 'components/header.html' %}
</header>
<main id="main" class="main-container">{% include page %}</main>
<footer id="content-footer">
{% include 'components/footer.html' %}
</footer>
</div>
</body>
</html>
In the future we will define main.js, a minimal JavaScript to connect the events and the WebSockets client.
8. Create the page template
We will create the home page template, which will be the one that will be rendered when the page is loaded.
Create a folder called pages in your template folder and inside it create a file called home.html.
{# my-app/templates/pages/home.html #}
{% load static %}
<main data-controller="home">
<p>
<button data-action="click->home#randomNumber">Random number</button>
</p>
<h2 id="output-random-number"></h2>
</main>
As you can see, we have defined a button to launch the action of generating the random number (button) and the place where we will print the result (output-random-number).
9. Create frontend
Now we are going to create the frontend, the part where we will manage the JavaScript events and invoke the actions.
Download assets and unzip it in your static folder. You will be left with the following route: /static/js/.
10. Create View
We will create the view that will render the page for the first time (like Server Side Rendering). The rest of the times will be rendered dynamically (like Single Page Application).
In a normal Django application we would create a view, views.py, similar to the following:
# my-app/views.py
from django.shortcuts import render
# Create your views here.
def home(request):
return render(request, "pages/home.html")With LiveView, on the other hand, you will have the following structure.
# my-app/views.py
from django.shortcuts import render
from .actions.home import get_context as get_home_context
from liveview.utils import get_html
async def home(request):
return render(request, "layouts/base.html", await get_home_context())11. Create URL
Finally, we will create the URL that will render the page.
# my-app/urls.py
from django.urls import path
from .views import home
urlpatterns = [
path("", home, name="home"),
]12. Run the server
Run the server.
python manage.py runserver
And open the browser at http://localhost:8000/. You should see the home page with a button that generates a random number.
Tutorials
In progress
Source code
You can find all the source code in the following repositories:
- LiveView: Source code of the Django framework and app published in pip.
- Website and Docs: All documentation, including this same page.
-
Templates
-
Demos
- Snake: The classic game of Snake.