Guide on how to pre-cache Django HTML templates with a service worker

Currently, I am in the process of converting my Django project into a progressive web app. As part of this transition, I want to precache my files to ensure they are available offline. However, I'm encountering an issue in locating my templates (e.g. homepage.html, index.html) to precache them using my service worker. The service worker is currently placed inside the static folder.

The current structure of my folders is as follows:

main/
-- migrations/
-- static/
---- js/
------ core/
------ plugins/
------ app.js
---- css/ 
---- img/ 
---- templates/
------ base.html
------ about.html
------ homepage.html
----*serviceWorker.js*
-- __init.py__
-- admin.py
-- apps.py
-- models.py
-- views.py
my_second_app/
-- migrations/
-- static/
---- js/
------ index.js
---- css/ 
---- img/ 
---- templates/
------ base.html
------ user.html
------ page.html
-- __init__.py

I need assistance in mapping the HTML templates for both my main app and my_second_app in my serviceWorker.js located within the static folder. Any help would be greatly appreciated. Please let me know if there's a better approach that I should consider :)

On a positive note, I have managed to successfully precache the static files. Here is a snippet of my code:

const precached = [
  '/',
  '/screener/',
  '/accounts/login/',
  '/accounts/signup/',
  '/assets/js/now-ui-dashboard.js',
  '/assets/js/core/bootstrap.min.js',
  '/assets/js/core/jquery-ui.min.js',
  '/assets/js/core/jquery.3.2.1.min.js',
  '/assets/js/plugins/chart.bundle.min.js',
  '/assets/css/accounts.css',
  '/assets/css/bootstrap.min.css',
  '/assets/css/now-ui-dashboard.css',
  '/assets/css/user.css',
  '/assets/fonts/nucleo-outline.ttf'
]

self.addEventListener('install', function (event) {
  event.waitUntil(
    caches.open(staticCacheName).then(cache => {
      return cache.addAll(precached);
    })
    .then(() => {
      return self.skipWaiting();
    })
  );
});

Answer №1

Here are the steps to follow:

1) Start by setting up your serviceworker.js using the guidelines provided in this informative video: https://www.youtube.com/watch?v=ksXwaWHCW6k (Around the 27:30 mark, there is a demonstration on rewriting the serviceworker.js to cache fully rendered views (Assuming you meant views when referring to 'Templates').

2) Initialize the serviceworker on your base.html page as shown below:

# Add the following script in the <head> section of your mainApp/base.html

    <script type="text/javascript">
        // Initialize the service worker
        if ('serviceWorker' in navigator) {
            navigator.serviceWorker.register("{% url 'serviceworker' %}", { 
              scope: '.' // <--- MAKE SURE TO INCLUDE THIS
            }).then(function (registration) {
                console.log('ServiceWorker registration successful with scope: ', registration.scope);
            }, function (err) {
                console.log('ServiceWorker registration failed: ', err);
            });
        }
    </script>

3) Place the serviceworker.js file in your mainApp/Templates/ directory

4) Include the code snippet below in your mainApp/urls.py file (This enables the use of Django Templates {% Like this %} directly within your serviceworkers.js file!)

# mainApp/urls.py

urlpatterns = [
    ...
    path('serviceworker', (TemplateView.as_view(
      template_name="browsepages/serviceworker.js", 
      content_type='application/javascript',)), 
      name='serviceworker'),
]

This method worked effectively for my Django website. I hope it can also assist others (like myself) who came across this post.

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