Book Image

Object-Oriented JavaScript - Third Edition

By : Ved Antani, Stoyan STEFANOV
5 (1)
Book Image

Object-Oriented JavaScript - Third Edition

5 (1)
By: Ved Antani, Stoyan STEFANOV

Overview of this book

JavaScript is an object-oriented programming language that is used for website development. Web pages developed today currently follow a paradigm that has three clearly distinguishable parts: content (HTML), presentation (CSS), and behavior (JavaScript). JavaScript is one important pillar in this paradigm, and is responsible for the running of the web pages. This book will take your JavaScript skills to a new level of sophistication and get you prepared for your journey through professional web development. Updated for ES6, this book covers everything you will need to unleash the power of object-oriented programming in JavaScript while building professional web applications. The book begins with the basics of object-oriented programming in JavaScript and then gradually progresses to cover functions, objects, and prototypes, and how these concepts can be used to make your programs cleaner, more maintainable, faster, and compatible with other programs/libraries. By the end of the book, you will have learned how to incorporate object-oriented programming in your web development workflow to build professional JavaScript applications.
Table of Contents (25 chapters)
Object-Oriented JavaScript - Third Edition
About the Authors
About the Reviewer
Customer Feedback
Built-in Functions
Regular Expressions


Imagine you are listening to a radio program and they announce, "Big event! Huge! Aliens have landed on Earth!" You might think, "Yeah, whatever"; some other listeners might think "They come in peace"; and some might think, "We're all gonna die!". Similarly, the browser broadcasts events, and your code can be notified should it decide to tune in and listen to the events as they happen. Some example events are as follows:

  • The user clicks a button

  • The user types a character in a form field

  • The page finishes loading

You can attach a JavaScript function called event listener or event handler to a specific event and the browser will invoke your function as soon as the event occurs. Let's see how this is done.

Inline HTML attributes

Adding specific attributes to a tag is the laziest but the least maintainable way; take the following line of code as an example:

    <div onclick="alert('Ouch!')">click</div> 

In this case, when the user clicks on <div>, the click event fires...