November 2011
Intermediate to advanced
384 pages
13h 23m
English
Content preview from HTML5: Your visual blueprint™ for designing rich web pages and applicationsBecome 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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IDENTIFY WHETHER THE BROWSER IS ONLINE
There are two ways to detect whether a browser is online or offline in JavaScript. The first is to query the navigator.onLine property, if supported, to give the current state of the network connection media. So if the Ethernet cable is unplugged or the Wi-Fi connection is lost, this property is updated. The second way is to listen to the online and offline browser events, if supported, to notify you when the navigator.onLine property changes.
This is true in most browsers and operating systems, but there are some notable exceptions:
- Internet Explorer 9 does provide the navigator.onLine property, but it will not post online and offline events when it changes.
- Firefox 5 and Opera 11.50 do provide navigator.onLine ...
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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.