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Learn Chart.js

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

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Product type Paperback
Published in Feb 2019
Publisher
ISBN-13 9781789342482
Length 284 pages
Edition 1st Edition
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Author (1):
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Helder da Rocha Helder da Rocha
Author Profile Icon Helder da Rocha
Helder da Rocha
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Table of Contents (9) Chapters Close

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

Time scales


You can use simple string categories to represent dates and temporal information, but by using an axis of the time type, you can parse, format, and generate temporal data. This allows greater flexibility and interactivity.

The time scale requires the moment.js library (momentjs.com). To use the time scale, you can either import the moment.js library or include the Chart.bundle.js library in your page. It's best to import moment.js since you might want to use other date and time functions. You can do that including by it in your page via CDN:

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.js">
 </script>

The data is usually configured using the point structure, where the x property is a Date and the y property is some quantitative value. You can also use the t property instead of x. Many standard date formats are parsed automatically. These are some valid data points for time:

{x: new Date(), y: 1} // now
{t: ‘20190224’, y: 2} // 2019-02-24...
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