Anthony T. Holdener III - HTML5 Geolocation
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Copyright 2011 Anthony T. Holdener, III
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Nutshell Handbook, the Nutshell Handbook logo, and the OReilly logo are registered trademarks of OReilly Media, Inc. HTML5 Geolocation , the image of a cape petrel, and related trade dress are trademarks of OReilly Media, Inc.
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To Kate and Tony: Remember to take the road less traveled in life, and bring along a good GPS device just in case.
This book explores the W3C Geolocation API , a specification that provides scripted access to geographical location information associated with a hosted device.[] This API defines objects that can be used in JavaScript to ascertain the position of the device on which the code is executed.
The term geolocation may refer to the act of identifying a persons position, or it may refer to the actual location itself.
The W3C Geolocation API brings incredible functionality to the browser. Previously, geolocation services were only made available by developers who were writing geolocation applications natively for a particular device. Now, developers have the freedom to write geolocation applications for the Web directly in the browser, and these applications have the advantage of the write once, deploy everywhere application model.
What Is with the Title?
Before I proceed, I would like to apologize for the title: HTML5 Geolocation . The Geolocation API is not technically a part of the W3Cs HTML5 Specification, so calling it the HTML5 Geolocation API is just plain wrong and I know it.
That being said, I challenge any of you to run a Google search for Geolocation API or HTML5 APIs and see how many of the hits you get have HTML5 Geolocation as the title. As you will find, there are very few results besides the actual W3C Geolocation API Working Draft , which omits the HTML5 part. Furthermore, I attended several JavaScript sessions at the 2011 Esri Developer Summit in Palm Springs, California, and every presenter speaking about the Geolocation API also used HTML5 in conjunction with it. Every single one. These people know their Geographic Information Systems (GIS). They live and breathe it, and they happen to work for the leading GIS software company in the world.
The simple fact is that we associate HTML5 and Geolocation. So to avoid any confusion that might have arisen had I not used HTML5, and since neither myself nor my editor could really come up with a snazzier title for this book, HTML5 Geolocation stuck.
This book is intended for developers interested in using the W3C Geolocation API in their web applications. The first few chapters delve into what geolocation is, its history, and how it is currently being utilized today.
These first chapters of the book are a crash course in geolocation to provide a framework for understanding what the API is about. If you are already in the GIS industry and just want to know how to implement this new Application Programming Interface (API) in your applications, or already know all there is to know about geolocation, then skip ahead to to see the API in action.
Developers should be particularly interested in ties things up by exploring what the future of geolocation holds for us all, and discusses practical applications for development using the Geolocation API.
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Constant width italicShows text that should be replaced with user-supplied values or by values determined by context.
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This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: HTML5 Geolocation by Anthony T. Holdener III (OReilly). Copyright 2011 Anthony T. Holdener, III, 978-1-449-30472-0.
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