February 2014
Beginner
303 pages
6h 56m
English
Content preview from Learning Web App DevelopmentBecome 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 4. The Interactivity
So far, we’ve studied three very important aspects of web application development. Sadly, however, we haven’t built an application that actually does anything. We’ve just been able to structure content and then style it so it looks interesting.
In this chapter, we’re going to start exploring interactivity. This will allow us to go beyond building web pages that don’t change. Instead, we’ll begin building dynamic applications that respond to user input.
To this end, we’ll learn a little bit about JavaScript, the scripting language that runs inside every web browser, and jQuery, a JavaScript library that’s useful for manipulating the DOM (among other things). In addition, we’ll spend some time learning the basics of JavaScript as a language, with an emphasis on using and manipulating arrays.
Hello, JavaScript!
Let’s start with an example. As before, we’ll create a directory in Projects called Chapter4. In this directory, we’ll start by creating a subdirectory called Example1 and open that directory in Sublime. Next, we’ll create three files: index.html, style.css, and app.js. We’ll start with index.html:
<!doctype html><html><head><title>App Name</title><linkhref="style.css"rel="stylesheet"type="text/css"></head><body><h1>App Name</h1><p>App Description</p><scriptsrc="http://code.jquery.com/jquery-2.0.3.min.js"></script><scriptsrc="app.js"></script></body></html>
Everything in index.html should be familiar with the exception of the <script> ...
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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.