August 2011
Intermediate to advanced
447 pages
14h 1m
English
Content preview from HTML5: The Missing ManualBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 10. Offline Applications
If you want to view a website, you need to connect to the Internet. Everybody knows that by now. So why a chapter about offline applications? The very notion seems so last century. After all, didn’t web applications overthrow several generations of offline, desktop applications on their way to conquering the world? And there are plenty of tasks—from following the latest Charlie Sheen sightings to ordering a new office chair—that just wouldn’t be possible without a live, real-time connection. But remember, even web applications aren’t meant to stay permanently online. Instead, they’re designed to keep working during occasional periods of downtime when a computer loses its network connection. In other words, an offline web application tolerates intermittent network disruptions.
This fact is particularly important for people using web-enabled phones and tablets. To see the problem, try traveling through a long tunnel while working on a web application with one of these devices. Odds are you’ll get a nasty error page, and you’ll need to start all over again when you get to the other side. But do the same with an offline web application, and you’ll avoid interruption. Some of the features of the web application may become temporarily unavailable, but you won’t get booted out. (Of course, some tunnels are longer than others. An ambitious offline web application can keep working through a three-hour plane flight—or a three-week trip to the Congo, if that’s ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.