July 2008
Beginner
543 pages
17h 59m
English
Content preview from JavaScript: The Missing ManualBecome 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. Dynamically Modifying Web Pages
JavaScript gives you the power to change a Web page before your very eyes. Using JavaScript, you can add pictures and text, remove content, or change the appearance of an element on a page instantly. In fact, dynamically changing a Web page is the hallmark of the newest breed of JavaScript-powered Web sites. For example, Google Maps (http://maps.google.com/) provides access to a map of the world; when you zoom into the map or scroll across it, the page gets updated without the need to load a new Web page. Similarly, when you mouse over a movie title at Netflix (www.netflix.com) an information bubble appears on top of the page providing more detail about the movie (see Figure 5-1). In both of these examples, JavaScript is changing the HTML that the Web browser originally downloaded.
The first four chapters of this book covered many of the fundamentals of the JavaScript programming language—the keywords, concepts, and syntax of JavaScript. Now that you have a handle on how to write a basic JavaScript program and add it to a Web page, it’s time to see what JavaScript programming is all about. This chapter, and the next one on JavaScript events, together show you how to create the great interactive effects you see on the Web these days.
Modifying Web Pages: An Overview
In this chapter, you’ll learn how to alter a Web page using JavaScript. You’ll add new content, HTML tags and HTML attributes, and also alter content and tags that are already on ...
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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.