Book Image

JavaScript by Example

By : Dani Akash S
Book Image

JavaScript by Example

By: Dani Akash S

Overview of this book

JavaScript is the programming language that all web developers need to learn. The first item on our JavaScript to-do list is building g a To-do list app, which you'll have done by the end of the first chapter. You'll explore DOM manipulation with JavaScript and work with event listeners. You'll work with images and text to build a Meme creator. You will also learn about ES (ECMAScript) classes, and will be introduced to layouts using the CSS3 Flexbox. You'll also develop a responsive Event Registration form that allows users to register for your upcoming event and use charts and graphics to display registration data. You will then build a weather application, which will show you different ways perform AJAX requests and work with dynamic, external data. WebRTC enables real-time communication in a web browser; you'll learn how to use it when you build a real-time video-call and chat application later in the book. Towards the end of the book, you will meet React, Facebook's JavaScript library for building user interfaces. You'll throw together a blog with React, and get a feel for why this kind of JavaScript framework is used to build large-scale applications. To make your blog more maintainable and scalable, you'll use Redux to manage data across React components.
Table of Contents (8 chapters)

Can you build a Weather Widget?

So, your project has around 40 developers working in different parts of the web application and a new requirement just popped up. They need to show a Weather Widget in some areas of the website. The Weather Widget needs to be responsive so that it can squeeze into any available space in any section of the web application.

We can surely build a Weather Widget but there is a problem. We have no idea about the rest of the web application! For example, what are the class and ID used in its HTML, since the styles created by CSS are always global? If we were to accidentally use a class that is already being used in some other part of the HTML in the web application, our widget will inherit the style of that DOM element, which we really need to avoid!

Another problem is will be that we would have created <div>. For example:

<div class="weather...