November 2011
Intermediate to advanced
140 pages
3h 46m
English
Content preview from Programming HTML5 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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Chapter 5. IndexedDB
The localStorage interface (see Chapter 4) provides a very nice interface for storing
small amounts of data, but the browser limits this storage space to 5 MB in
many cases. If the storage needs of an application go beyond that, or if the
application needs to have query access to structured data, local storage is not the best
choice. In this case, having a more robust storage mechanism can be useful
for the application developer. IndexedDB provides this mechanism on many
browsers. For example, a programmer may store product catalog data into an
IndexedDB store so that when the user searches for an item, the server does
not need to make a trip to the server to find the data for a particular
item.
IndexedDB is a NoSQL database that will feel familiar to people who have used such products as MongoDB or CouchDB. A program can store JavaScript objects directly into an IndexedDB data store.
IndexedDB has been in Firefox starting with version 4. It also was introduced into Google Chrome starting with version 11. Microsoft has a version online at its HTML5 Labs website as an ActiveX control, which can be added into IE, and presumably it will be in the main IE release at some point. It will probably be available in other browsers in the next year or two. Formally, IndexedDB is now a draft proposal from the W3C.
Note
Because IndexedDB is supported by only two browsers at this point, use should probably be restricted to internal applications where you can limit use to browsers ...
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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.