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JavaScript

Cookbook

PROGRAMMING THE WEB

Shelley Powers

iti

JavaScript Cookbook

Problem solving with JavaScript is a lot trickier now that its use has expanded

considerably in size, scope, and complexity. This cookbook has your back,

with recipes for common tasks across the JavaScript world, whether you’re

working in the browser, the server, or a mobile environment. Each recipe

includes reusable code and practical advice for tackling JavaScript objects,

Node, Ajax, JSON, data persistence, graphical and media applications, complex

frameworks, modular JavaScript, APIs, and many related technologies.

Aimed at people who have some experience with JavaScript, the first part

covers traditional uses of JavaScript, along with new ideas and improved

functionality. The second part dives into the server, mobile development,

and a plethora of leading-edge tools. You’ll save time—and learn more

about JavaScript in the process.

Topics include:

Classic JavaScript:

■

“

Acomprehensive,example-

driventourofthelanguage

anditsplatforms.

”

author of

Speaking JavaScript

—Dr. Axel Rauschmayer

Arrays, functions, and the JavaScript Object

Accessing the user interface

Testing and accessibility

Creating and using JavaScript libraries

Client-server communication with Ajax

Rich, interactive web effects

JavaScript, All Blown Up:

■

New ECMAScript standard objects

Using Node on the server

Modularizing and managing JavaScript

Complex JavaScript frameworks

Advanced client-server communications

Visualizations and client-server graphics

Mobile application development

Shelley Powers

has been working

with and writing about web tech-

n o logie s—from th e fir st releas e

of JavaScript to the latest graphics

and design tools—for more than 18

years. Her recent O’Reilly books have

covered JavaScript, HTML5 media

objects, Ajax, and web graphics.

JAVA SCRIPT/ WEB

Twitter: @oreillymedia

facebook.com/oreilly

CAN $57.99

US $49.99

ISBN: 978-1-491-90188-5

SECOND EDITION

JavaScript Cookbook

Shelley Powers

JavaScript Cookbook, Second Edition

by Shelley Powers

Printed in the United States of America.

Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.

O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are

also available for most titles (http://safaribooksonline.com). For more information, contact our corporate/

institutional sales department: 800-998-9938 or

corporate@oreilly.com.

Editors:

Simon St. Laurent and Brian MacDonald

Production Editor:

Kara Ebrahim

Copyeditor:

Jasmine Kwityn

Proofreader:

Kara Ebrahim

February 2015:

Second Edition

Indexer:

Judy McConville

Cover Designer:

Ellie Volckhausen

Interior Designer:

David Futato

Illustrator:

Rebecca Demarest

Revision History for the Second Edition:

2015-01-23:

First release

See

http://oreilly.com/catalog/errata.csp?isbn=9781491901885

for release details.

The O’Reilly logo is a registered trademark of O’Reilly Media, Inc.

JavaScript Cookbook, Second Edition,

the

cover image of a little egret, and related trade dress are trademarks of O’Reilly Media, Inc.

While the publisher and the author have used good faith efforts to ensure that the information and instruc‐

tions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors

or omissions, including without limitation responsibility for damages resulting from the use of or reliance

on this work. Use of the information and instructions contained in this work is at your own risk. If any code

samples or other technology this work contains or describes is subject to open source licenses or the intel‐

lectual property rights of others, it is your responsibility to ensure that your use thereof complies with such

licenses and/or rights.

ISBN: 978-1-491-90188-5

[LSI]

Table of Contents

The World of JavaScript. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Part I.

Classic JavaScript

iii

1. The JavaScript Not-So-Simple Building Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1. Differentiating Between a JavaScript Object, Primitive, and Literal

1.2. Extracting a List from a String

1.3. Checking for an Existing, Nonempty String

1.4. Inserting Special Characters

1.5. Replacing Patterns with New Strings

1.6. Finding and Highlighting All Instances of a Pattern

1.7. Swapping Words in a String Using Capturing Parentheses

1.8. Replacing HTML Tags with Named Entities

1.9. Converting an ISO 8601 Formatted Date to a Date Object Acceptable

Format

1.10. Using Function Closures with Timers

1.11. Tracking Elapsed Time

1.12. Converting a Decimal to a Hexadecimal Value

1.13. Summing All Numbers in a Table Column

1.14. Converting Between Degrees and Radians

1.15. Find the Radius and Center of a Circle to Fit Within a Page Element

1.16. Calculating the Length of a Circular Arc

1.17. Using ES6 String Extras Without Leaving Users in the Dirt

2.1. Searching Through an Array

2.2. Flattening a Two-Dimensional Array with concat() and apply()

2.3. Removing or Replacing Array Elements

2.4. Extracting a Portion of an Array

2. JavaScript Arrays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

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