Book Image

Learn D3.js

By : Helder da Rocha
2 (1)
Book Image

Learn D3.js

2 (1)
By: Helder da Rocha

Overview of this book

This book is a practical hands-on introduction to D3 (Data-driven Documents): the most popular open-source JavaScript library for creating interactive web-based data visualizations. Based entirely on open web standards, D3 provides an integrated collection of tools for efficiently binding data to graphical elements. If you have basic knowledge of HTML, CSS and JavaScript you can use D3.js to create beautiful interactive web-based data visualizations. D3 is not a charting library. It doesn’t contain any pre-defined chart types, but can be used to create whatever visual representations of data you can imagine. The goal of this book is to introduce D3 and provide a learning path so that you obtain a solid understanding of its fundamental concepts, learn to use most of its modules and functions, and gain enough experience to create your own D3 visualizations. You will learn how to create bar, line, pie and scatter charts, trees, dendograms, treemaps, circle packs, chord/ribbon diagrams, sankey diagrams, animated network diagrams, and maps using different geographical projections. Fundamental concepts are explained in each chapter and then applied to a larger example in step-by-step tutorials, complete with full code, from hundreds of examples you can download and run. This book covers D3 version 5 and is based on ES2015 JavaScript.
Table of Contents (13 chapters)

Creating a scatterplot

In this final section, you will use the features that you learned about in this chapter to create a scatterplot and compared the Gross Domestic Product (GDP) per capital and the Human Development Index (HDI) of several countries. This is a step-by-step tutorial. We will start with a simple chart and add axes, labels, and interactive features. You can code as you go or download the files that are available from the StepByStep/ folder, in the GitHub repository for this chapter.

The CSV data file that's used for this visualization (Data/un_regions_gdp.csv) contains data that was obtained from several sources, such as the United Nations and the World Bank. Both the HDI and GDP are from 2017, so they can be compared. The following is a fragment of this file, showing the headers and some rows of data:

Country,Continent,Area_km2,Pop_2016,HDI_2017,Code,GDP_2017...