December 2013
Intermediate to advanced
518 pages
15h 36m
English
Content preview from HTML5: The Missing Manual, 2nd EditionBecome 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. Storing Your Data
On the Web, there are two places to store information: on the web server, or on the web client (the viewer’s computer). Certain types of data belong on one, while others work better on the other.
The web server is the place to store sensitive information and data you don’t want people tampering with. For example, if you fill your shopping cart at an online bookstore, your potential purchases are stored on the web server, as are the catalog of books, the history of past sales, and just about everything else. The only data your computer keeps is a tiny bit of tracking information that tells the website who you are, so it knows which shopping cart is yours. Even with HTML5, there’s no reason to change this setup—it’s safe, secure, and efficient.
But server-side storage isn’t the best bet for every website. Sometimes, it’s easier to keep nonessential information on the web surfer’s computer. For example, local storage makes sense for user preferences (for example, settings that influence how the web page tailors its display) and application state (a snapshot of where the web application is right now, so the web visitor can pick up at the same spot later on). And if the data takes time to calculate or retrieve from the web server, you may be able to improve performance by storing it on the visitor’s computer.
Before HTML5, the only way to get local storage was to use cookies, a mechanism originally devised to transmit small bits of identifying information between ...
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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.
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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.