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D3.js Quick Start Guide

You're reading from   D3.js Quick Start Guide Create amazing, interactive visualizations in the browser with JavaScript

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789342383
Length 180 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Matthew Huntington Matthew Huntington
Author Profile Icon Matthew Huntington
Matthew Huntington
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Toc

Table of Contents (10) Chapters Close

Preface 1. Getting Started with D3.js 2. Using SVG to Create Images Using Code FREE CHAPTER 3. Building an Interactive Scatter Plot 4. Making a Basic Scatter Plot Interactive 5. Creating a Bar Graph Using a Data File 6. Animating SVG Elements to Create an Interactive Pie Chart 7. Using Physics to Create a Force-Directed Graph 8. Mapping 9. Other Books You May Enjoy

Create data/configuration variables

At the bottom of the <body> tag, we're referencing an app.js file. Let's create that file and add the following code to it:

var WIDTH = 360;
var HEIGHT = 360;
var radius = Math.min(WIDTH, HEIGHT) / 2;

var dataset = [
    { label: 'Bob', count: 10 },
    { label: 'Sally', count: 20 },
    { label: 'Matt', count: 30 },
    { label: 'Jane', count: 40 }
];
console.log(dataset);

To be sure that it's working and linked up properly, we've added console.log(dataset) to the bottom. Let's open index.html in Chrome and view the developer console, to make sure that everything is hooked up the way it should be:

Once we're sure that it's working, we can remove console.log(dataset);, as follows:

var WIDTH = 360;
var HEIGHT = 360;
var radius = Math.min(WIDTH, HEIGHT) / 2;
...
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