January 2012
Intermediate to advanced
178 pages
4h 31m
English
book
Building Android Apps with HTML, CSS, and JavaScript, 2nd Edition
by Jonathan Stark, Brian Jepson, Brian MacDonald
Content preview from Building Android Apps with HTML, CSS, and JavaScript, 2nd Edition
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Online Whitelist and Fallback Options
It is possible to force the browser to always
access certain resources over the network (this process is known as
whitelisting). This means the browser will not cache
them locally and they will not be available when the user is offline. To
specify a resource as online only, use the NETWORK: keyword
(the trailing : is essential) in the manifest file like
so:
CACHE MANIFEST index.html scripts/demo.js styles/screen.css NETWORK: logo.jpg
This whitelists logo.jpg by moving it into the
NETWORK section of the manifest file. When the user is
offline, the image will show up as a broken image link (Figure 6-2). When he is online, it will appear
normally (Figure 6-3).
If you don’t want offline users to see the
broken image, use the FALLBACK keyword to specify a fallback
resource like so:
CACHE MANIFEST index.html scripts/demo.js styles/screen.css FALLBACK: logo.jpg offline.jpg
Now, when the user is offline, he’ll see offline.jpg (Figure 6-4), and when he’s online, he’ll see logo.jpg (Figure 6-5).
Figure 6-2. Whitelisted images will show up as broken links when the user is offline
Figure 6-3. Whitelisted images will show up normally when the user is online
Figure 6-4. Fallback ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.