July 2009
Intermediate to advanced
464 pages
12h 25m
English
Content preview from Palm webOSBecome 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 2. Application Basics
Palm webOS provides a great environment for building applications. The use of standard web development languages and tools, combined with access to native services and local data gives you a powerful and productive platform. Even Java and C/C++ developers will find that building applications using dynamic languages on webOS is fun and exciting. And despite what you might have heard, you can build real applications, not just web gadgets and spinners.
A browser-based web application is really just a set of complex web pages. They are downloaded from a web server and present their UIs as HTML, often with JavaScript as a client-side language to validate input, animate page elements, and make background Ajax calls back to the web server for additional interactivity.
If you are a developer writing these web applications, the Palm webOS development environment will feel familiar. JavaScript library code generates the HTML UI, interacts with page elements, and issues Ajax calls to web servers. You can style the UI with CSS, either to make your application look and feel consistent with Palm’s style guidelines or to make your own unique look.
The programming model is a little different. Since the HTML is not generated on a server (say, using Java, PHP, or Ruby), there is no request/response lifecycle. Instead, all of your application code is in JavaScript—even interactions with key webOS systems (UI widgets, location services, and other applications) are made with ...
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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.