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)

Adding charts to the website using Chart.js

We just created a nice little registration form for our users. It's now time to work with the second section of our Event Registration app. The status page shows a chart for the number of people interested in the event based on experience, profession, and age. If you open the status page now, it should show a data loading... message with the loading indicator image. But I have built all the necessary components needed for this page in the status.html file. They are all currently hidden using Bootstrap's .hidden class.

Let's see what's present in the status.html file. Try removing the .hidden class from each of the following sections to see how they look in the web application.

First is the loading indicator section which is currently being displayed on the page:

<div id="loadingIndicator">