JavaScript Certification Training

This is a tutorial about the introduction to the Javascript programming language offered by Simplilearn. The tutorial is part of the Javascript Certification Training course.

The JavaScript programming language is an all-inclusive program, which includes JavaScript fundamentals such as jQuery, Ajax, and more.

What is JavaScript?

Javascript is a very powerful client-side language. This means that JavaScript doesn't run on the server. Therefore, any JavaScript that is run on the web pages will not slow down the server, but it could slow down the user's browser.

Given below are some features of JavaScript.

  • JavaScript is not the same as the computer programming language Java, but they are similar in many ways. Although, JavaScript doesn't mean that you can just hop on into Java or vice versa.

  • JavaScript is a scripting language; meaning, it is rendered when the code is loaded.

  • This shorthand name JavaScript is often termed ‘js’.

  • JavaScript is similar to c programming language.

  • JavaScript is the primary way that we make websites dynamic without using service id languages.

  • JavaScript is case sensitive. Therefore, ‘A’ is not the same as ‘a’. Also, they are two different things and thus care should be taken while writing JavaScript.

  • Some of the powers that JavaScript has are; the ability to change the page, styling instantly (with just the click of a button), to change the background color or the font size, etc.

  • JavaScript can take in user input, do the math and can tell the date and time.

We can also do more than just that and these are just some of the examples of what javascript can do.

In the next section of the Javascript tutorial, we will discuss what AJAX is and how it can be used.

Want to learn more about JavaScript? Check out our course preview on JavaScript Tutorial.

What is AJAX?

AJAX, which stands for Asynchronous Javascript and XML is a part of the JavaScript. It is very popular in hiding and showing elements. Before we can know more about AJAX, let us have a look at Wikipedia's definition of AJAX.

  • AJAX is an acronym for Asynchronous Javascript and XML.

  • It is a group of interrelated web development techniques used on the client side and not the server side to create asynchronous web applications.

  • With AJAX web applications, we can send and retrieve data from a server asynchronously or in the background without interfering with the display or behavior of the existing page.

  • Data can be retrieved using the XMLHttpRequest object.

  • Despite the name, the use of XML is not quite required often as JSON can be used instead and these requests need not be asynchronous.

  • Ajax is not a single technology, but rather a group of technologies.

  • HTML and CSS can be used in combination with markup and style information. Hence, instead of just regular text, you can use HTML and CSS has to style it.

  • The DOM (Document Object Model) is accessed with JavaScript to dynamically display and allow the user to interact with the information presented by the JavaScript and the XML.

  • The Http object provides a method for exchanging data asynchronously between the browser and the server to avoid full page reloads.

  • Hence, we can use JavaScript to load other pages inside the currently loaded page and the information that we load can be styled using HTML, CSS, and PHP, which will run on the server.

We can have a regular text, JSON or XML. Once we load the page, we can actually access all the information from the JavaScript and use that JavaScript to access our data or change something and makes it look more appealing in the web page.

For example, when a picture is clicked on a lot of websites, we notice that a big picture of it pops up. The webpage does not load two of the same images. It does not load a smaller one and a larger one to make the page load faster.

What it does is, it loads a small image and then when you click it, it will show you the large image. Later, it will AJAX that image in the same way. Instead of having to do a full page reload, all you have to do is click it.

It will AJAX a new image or the same image but only bigger, and that allows you not having to load that page again making the page look very dynamic.

Let’s discuss jQuery in the next section of the Javascript tutorial.

What is jQuery?

jQuery is a JavaScript library. There are many JavaScript libraries, such as MooTools,, Dojo Toolkit, Prototype JavaScript Framework and many more.

We learn about the jQuery libraries because of its simplicity and flexibility in helping us to add and remove classes, attributes, ideas, etc. We can even use AJAX and JSON in a very simple way.

It is the most popular JavaScript library for a reason. The best part is that, when we execute some jQuery, it will run the same way in all five major browsers where the normal JavaScript sometimes wouldn’t.

For instance, as in internet explorer how we had to run that extra code when trying to make an AJAX request with jQuery, we don't have to do that. It does it for us.

About JavaScript Development Suite

JavaScript Development Suite is a comprehensive training program that provides candidates with an exhaustive grounding of Ajax development fundamentals, JavaScript fundamentals, advanced JavaScript and fundamentals of jQuery.

IT organizations across the globe seek competent professionals who are trained in JavaScript. JavaScript is a dynamic programming language, which is multi-paradigm and supports object-oriented, functional and imperative programming styles.

It is basically a client-side scripting language that is used in creating interactive effects among the web browsers.

Benefits of Javascript Tutorial

With the constant advancement in technology and continuous change in programming platforms, the demand for trained JavaScript professionals is on a constant rise. Some of the major career benefits that come with learning Javascript are:

  • The average salary for a trained JavaScript developer is $102,000. Source: (

  • With the constant rise in the number of websites, and internet marketing becoming a norm, IT companies across the globe are seeking competent JavaScript developers

  • As organizations seek trained JavaScript professionals, trained professionals have an edge over their non-trained counterparts

Javascript tutorial Overview

The major learning benefits of the all-inclusive Javascript tutorial:

  • The JavaScript tutorial entails the fundamentals of JavaScript, which includes the enumeration and elaboration of various data types in the JavaScript.

  • It explains loops and conditional statements in the JavaScript.

  • JavaScript tutorial also elucidates the concepts of objects and variables in JavaScript.

  • Knowledge regarding the fundamentals of Ajax Development.

  • JavaScript for Absolute Beginners and JavaScript for Beginning Web Developers offered in this tutorial enable even the non-programmers to acquire the basics of JavaScript.

  • The JavaScript tutorial empowers the learning the real-time chat system with Node.js

  • Advanced JavaScript and Fundamentals of jQuery are also covered in this tutorial.

  • The Javascript tutorial makes one competent enough to build interactive and dynamic websites.

Topics Covered

Let us look at the chapters covered in this Javascript tutorial:

Lesson No.

Chapter Name

What you will learn?


Fundamentals of JavaScript

You will learn:

  • What Is Javascript

  • Internal Vs. External

  • document.write()

  • Prompting For Info

  • Redirecting And New Windows

  • Comparisons

  • getElementById()

  • Arrays

  • Breaking Out Of Loops


Intermediate JavaScript

You will learn about:

  • Script Tags

  • Console

  • Undefined, type of, NaN

  • Comparison Operators

  • Concatenation

  • Logical and mathematical Operators


Working with JavaScript Elements

You will learn about:

  • Array Prototype

  • Looping Over Arrays

  • Creating An Object

  • Dates And Times

  • Callback In Countdown


Bonus JavaScript Tips

You will learn about:

  • Linting

  • Minification


Introduction to JavaScript









Fundamentals of jQuery

You will learn about:

  • What Is jQuery

  • Selectors

  • When A Key Is Pressed

  • Changing CSS

  • jQuery.Ajax

  • Attributes

  • Animations


Fundamentals of Ajax Development

You will learn about:

  • What Is Ajax

  • How To Execute Ajax

  • readyStates And Status

  • Requests and responses


Create a Node.js Real-Time Chat Application

You will learn about:

  • Node And MongoDB

  • Inserting Data

  • Sending Messages

  • Outputting Statuses

  • Output Chat Messages


Advanced JavaScript

You will learn about:

  • Split And Substring

  • Try Catch And Throw

  • Regular Expressions

  • setInterval And setTimeout


With this, we come to an end to the introduction to JavaScript tutorial. In the next chapter, we will look into the Fundamentals of JavaScript.

  • Disclaimer
  • PMP, PMI, PMBOK, CAPM, PgMP, PfMP, ACP, PBA, RMP, SP, and OPM3 are registered marks of the Project Management Institute, Inc.

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