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
Contributors
Preface
Index

Titles


The default in Chart.js is to have the title turned off, since you can also create your title with greater flexibility in HTML. If you still want to have a title in your chart, you need to set at least set two properties: display (with the value true) and text (with the text of your title). Other properties you might want to configure are listed as follows:

Property

Value

Description

display

true or false

Displays the title. The default is false.

text

String or String[]

A string containing the text of the title or an array of strings, for a multi-line title.

fontStyle,fontFamily, fontSize, fontColor

String and Number

Font attributes. The default fontStyle is bold, but the others are inherited.

lineHeight

Number

The default line height is 1.2.

padding

Number

The default padding is 10.

position

'top', 'bottom', 'left' or 'right'

This is where the title should be placed. The default is 'top'. The titles' places on the sides will be rotated 90 degrees counterclockwise.

Main properties of the options.title...