April 2012
Intermediate to advanced
280 pages
6h 14m
English
Content preview from JavaScript Pocket Reference, 3rd Edition
Become 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,
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.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.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.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.
Chapter 11. Scripting Documents
Client-side JavaScript exists to turn static HTML documents into interactive web applications. The Document object represents the content of a web browser window, and it is the subject of this chapter. The Document object does not stand alone, however. It is the central object in a larger API, known as the Document Object Model, or DOM, for representing and manipulating document content.
Overview of the DOM
The Document Object Model, or DOM, is the fundamental API
for representing and manipulating the content of HTML documents. The API
is not particularly complicated, but there are a number of architectural
details you need to understand. First, you should understand that the
nested elements of an HTML or XML document are represented in the DOM as a
tree of objects. The tree representation of an HTML document contains
nodes representing HTML tags or elements, such as <body> and <p>, and nodes representing strings of
text. An HTML document may also contain nodes representing HTML comments.
Consider the following simple HTML document:
<html>
<head>
<title>Sample Document</title>
</head>
<body>
<h1>An HTML Document</h1>
<p>This is a <i>simple</i> document.
</html>The DOM representation of this document is the tree pictured in Figure 11-1.
Figure 11-1. The tree representation of an HTML document
If you are not already familiar with tree structures in computer ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.