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Home > Web Development > Web Programming > JavaScript and JSON Essentials
JavaScript and JSON Essentials
JavaScript and JSON Essentials

JavaScript and JSON Essentials: If you fancy a less verbose data format than CSV or XML, then JSON could be for you. This tutorial will teach you about using JSON with JavaScript for effective local storage or Internet transfers.

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JavaScript and JSON Essentials

Chapter 1. JavaScript Basics

JavaScript, which was introduced as LiveScript by Netscape Communications Corp, has grown leaps and bounds in the last few years. JavaScript was originally developed to make web pages more interactive, and control the behavior of the page. JavaScript programs are commonly embedded inside an HTML file. HTML is a markup language, and does not manipulate the behavior of a page once its loaded. Using JavaScript, web developers can set rules and verify if the rules were followed, avoiding any remote server resources for input validation or complex number crunching. Today JavaScript is not just used for basic input validation; it is used to access the browser's Document object, to make asynchronous calls to the web server, and to develop end-to-end web applications using software platforms such as Node.JS, which is powered by Google's v8 JavaScript engine.

JavaScript is considered to be one of the three building blocks that are required to create interactive web pages; it is the only programming language in the trinity that is HTML, CSS, and JavaScript. JavaScript is a case sensitive and a space insensitive language, unlike Python and Ruby. A JavaScript program is a collection of statements and those statements have to be included inside the <script>> tags.

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JavaScript has to be invoked from another application such as a browser. Browsers have a built-in JavaScript engine that interprets and executes the JavaScript on the webpage. The interpretation of JavaScript is from top to bottom and goes from left to right. SpiderMonkey and Rhino are few of the early JavaScript engines that were implemented by different browsers, such as Netscape Navigator and Mozilla Firefox.

Next is our simple Hello World program; the JavaScript program is in between the <script> tags in the head section. The script tags can either be added to the head tag or to the body tag. As JavaScript is not non-blocking, the scripts hold the page until they are loaded. It is common to see the scripts being loaded at the end; this would work if there were no dependencies to other files or elements. One such example of a dependency would be a library that is used from a different location. We will be looking at a lot of these examples in the later chapters. We will be discussing the role of Unobtrusive JavaScript at a later point. For our Hello World program, use a text editor of your choice, and save this program with an HTML extension. Load the file in a web browser, and a pop-up box with the text Hello World! should be loaded on the page.

The following code snippet is the first_script.html file:

The output is as follows:

Variables in JavaScript

Now that we have built a Hello World program, let us take the next step and perform a few arithmetic operations on two numbers.

Note

The semi colon (;) is a statement terminator, it tellsthe JavaScript engine that a statement has ended.

Let us take a look at another program, alert_script.html:

The previous program would run and produce four pop-up windows, one after the other, displaying their respective values. A glaring problem here is that we are repetitively using the same numbers in multiple places. If we had to perform these arithmetic operations on a different set of numbers, we would have had to replace them at multiple locations. To avoid this situation, we would assign those numbers to temporary storage locations; these storage locations are often referred to as variables.

The keyword var is used to declare a variable in JavaScript, followed by the name of that variable. The name is then implicitly provided with a piece of computer memory, which we will use throughout the program execution. Let us take a quick look at how variables will make the earlier program more flexible:

Note

Code commenting can be done in two ways: one is single line, and the other is multiline.

Single line comments:

//This program would alert the sum of 5 and 3;
alert(5+3);

Multiline comments:

/* This program would generate two alerts, the first alert would display the sum of 5 and 3, and the second alert would display the difference of 5 and 3 */
alert(5+3);
alert(5-3);

Let us continue with the program:

Now let us alter the value from 5 to 6; the amount of change that we will make here is minimal. We assign the value of 6 to our variable a, and that takes care of the rest of the process; unlike our earlier script where changes were made in multiple locations. This is shown as follows:

Note

Code commenting is a recurring and an extremely important step in the development life cycle of any application. It has to be used to explain any assumptions and/or any dependencies that our code contains.

In JavaScript, we declare a variable by using the keyword var and until a value is assigned to it, the value of the variable will be implicitly set to undefined; that value is overwritten on variable initialization.

Arrays

Variables are good to hold single values, but for cases where a variable should contain multiple values, we would have to rely on arrays. A JavaScript array is a collection of items arranged in an order, according to their index. Each item, in the array, is an element and has an index, which is used to access that element. Arrays are like a bookshelf that holds more than one book; each book having its unique location. Arrays are declared using the array literal notation [].

Let us look at a simple array declaration:

Note

Arrays in JavaScript are zero based.

Let us initialize the array:

To access the value of a specific element, the reference index of that element is used. Once the reference index is identified, it can be outputted using the alert statement, as shown in the following screenshot:

Unlike variables, arrays are not typed, therefore, they can contain various types of data, as shown in the following screenshot:

A much more complex example of a JavaScript array is a multidimensional array, where there is a combination of arrays inside an array, as seen in the following screenshot:

To retrieve an element from a multidimensional array, we would have to use as many indexes as the levels in that array. If the multidimensional array contains an array that has the values that we want to access, we will have to choose the index where the array element exists, and then choose the index of the value inside the array that we are searching for. To retrieve the string Three from the multidimensionalArray example, we will have to first locate the index of the array containing the value Three, and then find the index of the value Three inside that array. This is shown as follows:

Note

The second way of declaring an array is by using the Array class.

var bookshelf = new Array()

Objects

Objects are another way of handling data. In arrays the indexes are commonly numerical; objects give us a robust way of assigning and retrieving data. Objects are derived from the object-oriented programming concept; a programming paradigm that is very popular. Objects are a virtual representation of real-time data; they allow us to organize our data into logical groups via properties and methods. Properties describe the state of the object, while methods describe the behavior of the object. Properties are a key-value pair that holds the information. Take a look at the following:

In the previous example, we have instantiated a person object, and then added the firstname and lastname properties that described the object. We added behavior to the object by creating a method called getFullName, the method accessed the object properties, retrieved the data, and alerted the output onto the screen. In this example the properties are accessed by the dot notation; we could also access a property by putting the property name in square brackets similar to an array, but it is not popular. This is shown as follows:

The second way of creating an object is by using the curly braces. Here we are introduced to the this keyword, which provides a reference to the object's properties and methods, as shown in the following:

The Carousel application

We will be working on a Carousel application, which is powered by a JSON feed. We will be using HTML, JavaScript, and JSON to build this application. This application will have its very own navigation system coupled with a timer event in the background, which will rotate the items at a given interval. We will also be discussing how user experience plays an important role in developing such an application.

Summary

This chapter is a basic introduction to the principles of JavaScript that we will be utilizing in our journey towards mastering JSON. Variables, arrays, and objects play a very important role in carrying the data across the network. If this is your first encounter with JavaScript, go through the examples another time and practice them. We will need a strong foundation in order to build a solid understanding of JSON, and how it can be used in real-time web applications.

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Key benefits

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

Description

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.

Who is this book 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.

What you will learn

  • 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
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Publication date : Oct 24, 2013
Length: 120 pages
Edition : 1st
Language : English
ISBN-13 : 9781783286034
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Concepts :
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Edition : 1st
Language : English
ISBN-13 : 9781783286034
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Programming

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JavaScript and JSON Essentials
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Table of Contents

8 Chapters
JavaScript Basics Chevron down icon Chevron up icon
JavaScript Basics
Variables in JavaScript
Arrays
Objects
The Carousel application
Summary
Getting Started with JSON Chevron down icon Chevron up icon
Getting Started with JSON
The Hello World program with JSON
Datatypes in JSON
Languages that support JSON
Summary
Working with Real-time JSON Chevron down icon Chevron up icon
Working with Real-time JSON
Accessing objects in JSON
Performing complex operations
Modifying JSON
Summary
AJAX Calls with JSON Data Chevron down icon Chevron up icon
AJAX Calls with JSON Data
Requirements for AJAX
Hosting JSON
Making your first AJAX call
Parsing JSON data
Summary
Cross-domain Asynchronous Requests Chevron down icon Chevron up icon
Cross-domain Asynchronous Requests
Making GET and POST AJAX calls with JSON data
The problem with cross-domain AJAX calls
Introduction to JSONP
Implementing JSONP
Summary
Building the Carousel Application Chevron down icon Chevron up icon
Building the Carousel Application
Setting up the application
Building the JSON file for the Carousel application
Creating the Carousel application with jQuery Cycle
Summary
Alternate Implementations of JSON Chevron down icon Chevron up icon
Alternate Implementations of JSON
Dependency management
JSON for storing metadata
Comparisons with YAML
Summary
Debugging JSON Chevron down icon Chevron up icon
Debugging JSON
Using the developer tools
Validating JSON
Formatting JSON
Summary

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shani Nov 04, 2017
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Good but less content more price
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Richard Crespo Silverio Oct 19, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Very good book for a developer to understand and learn JSON. Very good example provided on each chapter. There ware a few examples though that took time to get to work, hence the reason for 4 stars. I would recommend this to any developer who wants to get started or familiarize himself/ herself with JSON.
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K. C. Jul 30, 2016
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
4 stars because the book is very short in terms of number of pages. It does provide only the essentials of JavaScript and JSON, as stated in the title. I would like to have seen another example with a variety of JSON supported data types used or just more examples or sample files with the html, javascript and JSON. The book did help me understand something of the use of the languages together.
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Han Qi Sep 18, 2015
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Clear, concise!
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Howard Gissinger Jul 27, 2015
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very well presented
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About the author

Profile icon Sai S Sriparasa
Sai S Sriparasa
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. Oz's website, and has led teams for companies such as Sprint Nextel, West Interactive, and Apple. Sai's repertoire includes JavaScript, PHP, Python, HTML5, responsive web development, ASP.NET, C#, and Silverlight.
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Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela