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.

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Table of Contents (14 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
About Packt
About Packt
Contributors
Contributors
Preface
Preface
Free Chapter
1
Introduction
Introduction
Data visualization
Why use a data visualization library?
How to use this book
Summary
References
2
Technology Fundamentals
Technology Fundamentals
Essential JavaScript for Chart.js
Other technologies
Data formats
Loading and parsing external data files  
Extracting and transforming data
Summary
3
Chart.js - Quick Start
Chart.js - Quick Start
Introduction to Chart.js
Creating a simple bar chart
Creating a bar chart
Configuring colors, fonts, and responsiveness
Options configuration
Global defaults
Transitions, interactions, and tooltips
Updating charts
Working with larger and multiple datasets
Horizontal bar chart
Stacking bars
Summary 
References
4
Creating Charts
Creating Charts
Line and area charts
Stacked area charts
Radar charts
Pie and doughnut charts
Polar area charts
Scatter and bubble charts
Summary
References
5
Scales and Grid Configuration
Scales and Grid Configuration
Configuring scales
Cartesian configuration options
Cartesian axes, ticks, and grid lines
Numeric Cartesian scales
Category scales
Time scales
Radial scales
Configuring advanced scales
Summary
References
6
Configuring Styles and Interactivity
Configuring Styles and Interactivity
Default configuration
Fonts
Colors, gradients, patterns, and shadows
Gradients
Patterns
Shadows and bevels
Adding text elements and labels
Titles
Events
Summary
References
7
Advanced Chart.js
Advanced Chart.js
Tooltip configuration
Hovering interactions
Scriptable properties
Custom HTML tooltips
HTML legends
Displaying multiple charts
Mixed charts
Extending Chart.js
Creating plugins
Chart.js extensions
Summary
References
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Index
Index

Radial scales

Two Chart.js chart types use radial scales: radar and polarArea. Radial charts that have a single scale are configured with the properties listed here. Some properties are similar to the properties used in Cartesian scales, but they have fewer configuration options:

Property

Value

Description

pointLabels

Object

Configure point labels

ticks

Object

Configure chart ticks

angleLines

Object

Configures radial grid lines

gridLines

Object

Configure concentric grid lines

Configuration objects for radial scales

These properties are used directly inside the options.scale object. For example:

options: {
     scale: {
         ticks: {…},
         angleLines: {…},
         gridLines: {…},
         pointLabels: {…}
     }
 }

Configuring point labels

Point labels are the labels that are displayed around the radial chart, at each angle line. Tick labels are placed inside the chart over the first angle line and have a backdrop. Point labels are configured with the scale.pointLabels property, which is an object...

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