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The links below display the source code for the 124 numbered examples in the 5th edition of my book JavaScript: The Definitive Guide. Cut-and-paste the code in order to try it out yourself and use it in your own programs.

See the "O'Reilly Policy on Re-Use of Code Examples from Books" for details on how you may and may not use these examples. In most cases, it suffices to simply provide suitable attribution, in the source code and documentation of your program, with a comment like the following:

// This code is from the book JavaScript: The Definitive Guide, 5th Edition,
// by David Flanagan. Copyright 2006 O'Reilly Media, Inc. (ISBN #0596101996)

Please note that the examples are not production code. They are provided "as-is" and come with no warranty of any kind.

You can download the entire bundle of examples from the O'Reilly website.

Chapter 1: Introduction to JavaScript
1-1 A simple JavaScript program
1-2 An HTML button with a JavaScript event handler defined
1-3 Computing loan payments with JavaScript
Chapter 3: Datatypes and Values
3-1 Copying, passing, and comparing by value
3-2 Copying, passing, and comparing by reference
3-3 References themselves are passed by value
3-4 Are strings compared by value or by reference?
Chapter 8: Functions
8-1 Defining JavaScript functions
8-2 Using functions as data
8-3 Object utility functions
8-4 Array utility functions
8-5 Utility functions for functions
8-6 Private properties with closures
8-7 Breakpoints using closures
Chapter 9: Classes, Constructors, and Prototypes
9-1 A circle class
9-2 A complex number class
9-3 Subclassing a JavaScript class
9-4 Borrowing methods from one class for use by another
9-5 Mixin classes with generic methods for borrowing
9-6 Enhanced typeof testing
9-7 Testing whether an object borrows the methods of a class
9-8 Testing whether an object provides methods
9-9 Testing for array-like objects
9-10 A utility function for defining classes
9-11 Using the defineClass() method
Chapter 10: Modules and Namespaces
10-1 Creating a namespace based on a domain name
10-2 A complex number class as a module
10-3 A module of shapes classes
10-4 Defining a private namespace with a closure
10-5 A module of module-related utilities
Chapter 12: Scripting Java
12-1 A Java program for running JavaScript scripts
12-2A Java configuration file utility that interprets JavaScript expressions
12-3 Implementing a Java interface with JavaScript code.
Chapter 14: Scripting Browser Windows
14-1 Extracting arguments from a URL
14-2 Portably querying window geometry
14-3 Determining browser vendor and version
14-4 Creating and manipulating windows
14-5 Using the confirm() method
14-6 A tasteful status line animation
14-7 A navigation bar
Chapter 15: Scripting Documents
15-1 Listing all anchors
15-2 Traversing the nodes of a document
15-3 Obtaining all text beneath a DOM node
15-4 Selecting HTML elements by class or tag name
15-5 Alphabetizing the elements of a list
15-6 Converting document content to uppercase
15-7 Reparenting a node to a <b> element
15-8 Using a DocumentFragment
15-9 A logging facility for client-side JavaScript
15-10 Element creation utility functions
15-11 Automatically generating a table of contents
15-12 Querying the currently selected text
Chapter 16: Cascading Style Sheets and Dynamic HTML
16-1 Defining and using Cascading Style Sheets
16-2 Creating shadowed text with unobtrusive JavaScript
16-3 Displaying windows with CSS
16-4 Tooltips with CSS
16-5 A simple color-changing animation
16-6 A framework for CSS-based animations
16-7 Utility functions for manipulating className
16-8 Enabling and disabling stylesheets
16-9 Stylesheet utility methods
Chapter 17: Events and Event Handling
17-1 One function, many event handlers
17-2 An event compatibility layer for IE
17-3 Tooltips positioned via mouse events
17-4 Dragging document elements
17-5 Restricting user input to a set of characters
17-6 A Keymap class for keyboard shortcuts
17-7 Portable event registration for onload event handlers
17-8 Dispatching synthetic events
Chapter 18: Forms and Form Elements
18-1 An HTML form containing all form elements
18-2 Adding form validation to your HTML forms
18-3 Automatic form validation with unobtrusive JavaScript
Chapter 19: Cookies and Client-Side Persisence
19-1 Using the Cookie class
19-2 A Cookie utility class
19-3 PObject.js: persistent objects for JavaScript
19-4 ActionScript code for Flash-based persistence
Chapter 20: Scripting HTTP
20-1 The HTTP.newRequest() utility
20-2 The HTTP.getText() utility
20-3 The HTTP.getXML() utility
20-4 The HTTP.getHeaders() utility
20-5 The HTTP.post() utility
20-6 HTTP._getResponse()
20-7 The HTTP.get() utility
20-8 Ajax Tooltips
20-9 jsquoter.php
20-10 The HTTP.getTextWithScript() utility
http.jsThe combined http.js module
Chapter 21: JavaScript and XML
21-1 Creating an empty XML document
21-2 Loading an XML document synchronously
21-3 Loading an XML document asynchronously
21-4 Parsing an XML document
21-5 Getting an XML document from a data island
21-6 An XML data file
21-7 Building an HTML table from XML data
21-8 A simple XSL stylesheet
21-9 XSLT in Mozilla and Internet Explorer
21-10 Evaluating XPath Expressions
21-11 Serializing XML
21-12 An XML data island and HTML template
21-13 Expanding HTML templates
21-14 Querying a web service with SOAP
xml.jsThe combined xml.js module
Chapter 22: Scripted Client-Side Graphics
22-1 Adding a rollover effect to an image
22-2 Adding rollover effects unobtrusively
22-3 Initializing rollovers with XHTML and namespaces
22-4 Image animations
22-5 Drawing bar charts with CSS
22-6 The CSSDrawing class
22-7 Drawing a figure with the CSSDrawing class
22-8 Drawing a pie chart with JavaScript and SVG
22-9 SVG utility code
22-10 Drawing a pie chart with JavaScript and VML
22-11 Drawing a pie chart in an <canvas> tag
22-12 Canvas.as
22-13 Drawing a pie chart with JavaScript and Flash
22-14 A Java canvas applet for client-side drawing
22-15 Drawing a pie chart with JavaScript and Java
22-16 Creating a sparkline image with Javascript and Java
Chapter 23: Scripting Java Applets and Flash Movies
23-1 An applet suitable for scripting
23-2 Scripting the Java Plug-in
23-3 An applet using the Common DOM API
23-4 ActionScript code that works with JavaScript
23-5 Scripting a Flash movie
23-6 ActionScript using ExternalInterface
23-7 Simplified Flash scripting with ExternalInterface