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Learn Chart.js

You're reading from Learn Chart.js Create interactive visualizations for the Web with Chart.js 2

Product type Paperback

Published in Feb 2019

Publisher

ISBN-13 9781789342482

Length 284 pages

Edition 1st Edition

Languages

JavaScript

Tools

Canvas

Concepts

Data Visualization

Author (1):

Helder da Rocha

View More author details

Table of Contents (9) Chapters

Preface

1. Introduction

2. Technology Fundamentals FREE CHAPTER

3. Chart.js - Quick Start

4. Creating Charts

5. Scales and Grid Configuration

6. Configuring Styles and Interactivity

7. Advanced Chart.js

8. Other Books You May Enjoy

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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 Chart.defaults.global.tooltips. The properties of these objects that you can configure are listed in the following table:

Object	Value	Description
`titleSpacing`	Number	Space before and after each title line. Default is `2`.
`bodySpacing`	Number	Space before and after each tooltip item. Default is `2`.
`footerSpacing`	Number	Space before...

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Authors (1)

Helder da Rocha

Helder da Rocha

Helder teaches, writes and develops applications with Java and Web technologies since 1995. In 1996 he wrote one of the first books in Portuguese about HTML and JavaScript, and since then he created hundreds of presentations, tutorials, and course materials on Java, Java EE, programming tools, patterns, techniques, methodologies, HTML, CSS, JavaScript, SVG, XML and related technologies, data visualization, Arduino and Internet of Things. He holds a masters degree in Computer Science. He also has a background in the visual arts and design and has some of his artwork in permanent museum exhibits. He lives in Brazil, where he works as an independent consultant, developer and instructor and a frequent speaker at technological events.

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