Rowdy Rabouw
Offline first!
#1about 6 minutes
Understanding the role and lifecycle of service workers
Service workers are event-driven JavaScript files that run in the background, acting as a proxy between the browser and the network.
#2about 3 minutes
Caching static assets using the install event
Use the service worker's install event to open a versioned static cache and pre-populate it with core assets like CSS, fonts, and images.
#3about 3 minutes
Intercepting requests to serve files from the cache
The fetch event allows the service worker to intercept network requests and respond with assets directly from the cache for improved performance.
#4about 2 minutes
Implementing a custom offline fallback page
When a network request fails for an HTML document, catch the error and serve a pre-cached offline HTML page for a better user experience.
#5about 2 minutes
Dynamically caching pages as the user navigates
As the user visits new pages, intercept the successful network response and store a clone in a separate dynamic cache for future offline access.
#6about 2 minutes
Managing and cleaning up outdated cache versions
Use the activate event to iterate through existing cache keys and delete any that do not match the current version string, preventing stale content.
#7about 7 minutes
Prefetching content using the Intersection Observer API
Instead of prefetching all links, use the Intersection Observer API to only fetch and cache pages when their corresponding links enter the viewport.
#8about 1 minute
Adapting prefetching based on network conditions
Check the user's network connection type and save data preference to conditionally disable prefetching on slow or metered connections.
#9about 5 minutes
Creating a dynamic list of available offline pages
Enhance the offline fallback page by dynamically generating a list of links to all content that has been successfully stored in the cache.
#10about 4 minutes
Q&A on cache strategies and dynamic content
Answering audience questions about cache invalidation strategies, handling API calls with IndexDB, and the sustainability of caching.
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£35-45K
CSS
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JavaScript