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Sai Srinivas Sriparasa - JavaScript and JSON Essentials

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Sai Srinivas Sriparasa JavaScript and JSON Essentials
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Successfully build advanced JSON-fueled web applications with this practical, hands-on guide

Overview

  • Deploy JSON across various domains
  • Facilitate metadata storage with JSON
  • Build a practical data-driven web application with JSON

In Detail

The exchange of data over the Internet has been carried out since its inception. Delimiter-separated lists such as CSV and tag-separated languages such as XML are very popular, yet they are considered to be verbose by a section of developers. JSON (JavaScript Object Notation) is a lightweight text-based code to create objects to transfer data over the Internet. It is a data exchange format that is human-readable (like XML, but without the markup around your actual payload) and its syntax is a subset of the JavaScript language that was standardized in 1999.

JavaScript and JSON Essentials is a step-by-step guide that will introduce you to JSON and help you understand how the lightweight JSON data format can be used in different ways either to store data locally or to transfer data over the Internet. This book will teach you how to use JSON effectively with JavaScript.

This book begins with a brief refresher course on JavaScript before taking you through how JSON data can be transferred via synchronous, asynchronous, and cross-domain asynchronous HTTP calls. JSON is not just about data transfer; this book throws light on the alternate implementations of JSON as well.

You will learn the data types that JavaScript uses and how those data types can be used in JSON. You will go through the concepts of how to create, update, parse, and delete a JSON object. You will also look at the different techniques of loading a JSON file onto a web page, how to use jQuery to traverse through an object, and how to perform access operations. You will also go over a few resources that will make debugging JSON quick and easy.

What you will learn from this book

  • Learn how to work with real-time JSON
  • Transfer JSON data via asynchronous calls
  • Fire cross-domain asynchronous requests
  • Serialize and transmit data
  • Build the Carousel application
  • Understand alternate implementations of JSON
  • Debug JSON quickly and efficiently

Approach

The book follows a tutorial-based approach and will teach you how to work with JSON tools, design JSON objects, and how to use different techniques to handle JSON data.

Who this book is written for

This book is a great resource for developers who would like to learn more about JSON and who wish to apply it in their own projects. It will be useful to have some prior knowledge of HTML and JavaScript to help you understand the concepts covered in this book. Some familiarity with a server-side language such as PHP, C#, or Python would also be beneficial, but this is not compulsory.

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JavaScript and JSON Essentials

JavaScript and JSON Essentials

Copyright 2013 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: October 2013

Production Reference: 1181013

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78328-603-4

www.packtpub.com

Cover image by Ravaji Babu (<>)

Credits

Author

Sai Srinivas Sriparasa

Reviewers

Marco Lthy

Shameera Rathnayaka

Acquisition Editor

Joanne Fitzpatrick

Lead Technical Editor

Shaon Basu

Technical Editors

Pooja Nair

Anusri Ramchandran

Amit Shetty

Ritika Singh

Copy Editors

Alisha Aranha

Brandt DMello

Lavina Pereira

Project Coordinator

Akash Poojary

Proofreader

Ting Baker

Indexer

Monica Ajmera Mehta

Production Coordinator

Kirtee Shingan

Cover Work

Kirtee Shingan

About the Author

Sai Srinivas Sriparasa is a web developer and an open source evangelist living in the Stamford area. Sai was the lead developer for building Dr. Ozs website, and has led teams for companies such as Sprint Nextel, West Interactive, and Apple. Sais repertoire includes JavaScript, PHP, Python, HTML5, responsive web development, ASP.NET, C#, and Silverlight.

I want to convey my sincere thanks to the team at Packt Publishing for making this book possible, Shaon, Akash, and Sumeet in particular. This is my first book, so I want to thank all of the readers in advance for having taken the time to read my book. Please contact me on my LinkedIn profile http://www.linkedin.com/in/saisriparasa for networking or for any questions that you have.

My acknowledgments cannot be complete unless I thank my mom, dad, and sister for all their patience and support throughout my life. I hope you all enjoy this book and wish me luck for my next book.

About the Reviewers

Marco Lthy is a Swiss-born creator, designer, developer, and engineer for Internet-enabled applications and has over 10 years of experience working on projects deployed over the Internet. Occasionally he likes to dabble in content creation of the written and photographic kind. Marcos current focus is the Tokyo-based Internet media and application development firm Robotag Media, Inc., where he is co-founder and resident factotum working on making many useful, pretty things for us all to use and play with.

Shameera Rathnayaka is an Apache Axis2 committer and a PMC member, and has been actively contributing to several Apache projects for the past few years. He holds a B.Sc. Engineering (Hons) in Computer Science and Engineering from the University of Moratuwa, Sri Lanka. He first started his open source contributions with the Apache Axis2 project, where he implemented JDK 7 Enum support for Apache Axis2 as well as stream-based high performance solutions for JSON<-->XML lossless transformation. He is a Google Summer of Code participant with Apache Axis2 and Apache Airavata projects and has reviewed the book Instant GSON , Sandeep Kumar Patel , Packt Publishing .

Shameera currently works as a Software Engineer at WSO2 Inc., an open source enterprise middleware company based in Sri Lanka, where he is a member of the WSO2 Carbon team. His main research interests are in distributed computing.

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Preface

JavaScript and JSON Essentials is a one-stop resource that can be used for understanding and implementing JSON in various web applications. This book provides a comprehensive insight into how JSON can be implemented and integrated into your applications. Though JSON is one of the most popular data-exchange formats, the number of books available describing JSON and helping readers build a live solution is not high. This book is a comprehensive guide to JSON that begins with JavaScript basics, discusses the history of JSON, and then takes a step-by-step approach towards using JSON to build a live web application that is powered by JSON data.

What this book covers

, JavaScript Basics , is a basic refresher for common JavaScript concepts.

, Getting Started with JSON , introduces the audience to JSON, discusses the history of JSON, outlines the popular programming languages that support JSON, fires a Hello World program in JSON, and writes basic programs with different data types in JSON.

, Working with Real-time JSON , introduces the audience to complex JSON. The JSON used in this chapter will consist of multiple datatypes and multiple objects and will be multidimensional.

, AJAX Calls with JSON Data , goes over the requirements to successfully pass JSON over HTTP as JSON data has to transported over HTTP in real-world scenarios.

, Cross-domain Asynchronous Requests , introduces the audience to the concept of making asynchronous calls across domains. Since data is being transported across domains, users will be introduced to the concept of JSON with Padding.

, Building the Carousel Application

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