Book Image

Learn Chart.js

By : Helder da Rocha
Book Image

Learn Chart.js

By: Helder da Rocha

Overview of this book

Chart.js is a free, open-source data visualization library, maintained by an active community of developers in GitHub, where it rates as the second most popular data visualization library. If you want to quickly create responsive Web-based data visualizations for the Web, Chart.js is a great choice. This book guides the reader through dozens of practical examples, complete with code you can run and modify as you wish. It is a practical hands-on introduction to Chart.js. If you have basic knowledge of HTML, CSS and JavaScript you can learn to create beautiful interactive Web Canvas-based visualizations for your data using Chart.js. This book will help you set up Chart.js in a Web page and show how to create each one of the eight Chart.js chart types. You will also learn how to configure most properties that override Chart’s default styles and behaviors. Practical applications of Chart.js are exemplified using real data files obtained from public data portals. You will learn how to load, parse, filter and select the data you wish to display from those files. You will also learn how to create visualizations that reveal patterns in the data. This book is based on Chart.js version 2.7.3 and ES2015 JavaScript. By the end of the book, you will be able to create beautiful, efficient and interactive data visualizations for the Web using Chart.js.
Table of Contents (14 chapters)
Title Page
Copyright and Credits
About Packt

Tooltip configuration

Tooltips are the main feature used by Chart.js to reveal quantitative details about data. While some context comes from the grid, the only way to natively display data right next to the data point is using a tooltip. Of course, you can label the value points as we saw in the previous chapter, but that requires extensions or plugins, and may clutter your chart if used in excess. Chart.js visualizations rely on interactivity to show details. In this section, we will learn how to configure the way these details are displayed.

Tooltips can be configured for each chart using the tooltips key in the options object. They can also be configured for all charts using The properties of these objects that you can configure are listed in the following table:






Space before and after each title line. Default is 2.



Space before and after each tooltip item. Default is 2.



Space before...