November 2011
Intermediate to advanced
384 pages
13h 23m
English
Content preview from HTML5: Your visual blueprint™ for designing rich web pages and applications
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IDENTIFY WHETHER THE NETWORK IS ONLINE
Just because the browser is online or offline does not mean that the network connection is. There can be all sorts of connectivity problems between your browser and a website that the navigator.onLine property and the online and offline events will not respond to. The only way to counter this is to use the Ajax core library, XMLHttpRequest(), to actually query the website and test for network connectivity in your JavaScript code.
For this to happen, you need to listen for the existing online and offline events. When the browser is online, test the network. When it is offline, the network is lost:
addEventListener('online', testNetwork, false); addEventListener('offline', lostNetwork, false); function testNetwork() ...Become 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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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.