In this chapter we will cover:
- Setting up a simple D3 development environment
- Setting up an NPM-based development environment
- Understanding D3-style JavaScript
This chapter is designed to get you up and running with D3.js, covering fundamental aspects, such as what D3.js is, and how to set up a typical D3.js data visualization environment. One particular section is also devoted in covering some lesser known areas of JavaScript that D3.js relies heavily on.
What is D3? D3 refers to Data-Driven Documents, and according to the official D3 Wiki:
D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS. D3's emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework, combining powerful visualization components and a data-driven approach to DOM manipulation.
D3 Wiki (2013, August)
In a sense, D3 is a specialized JavaScript library that allows you to create amazing data visualizations using a simpler (data driven) approach by leveraging existing web standards. D3.js was created by Mike Bostock (http://bost.ocks.org/mike/) and superseded his previous work on a different JavaScript data visualization library called Protovis. For more information on how D3 was created and on the theory that influenced both Protovis and D3.js, please check out links in the following information box. Here in this book we will focus more on how to use D3.js to power your visualization. Initially, some aspects of D3 may be a bit confusing due to its different approach to data visualization using JavaScript. I hope that over the course of this book, a large number of topics, both basic and advanced, will make you comfortable and effective with D3. Once properly understood, D3 can improve your productivity and expressiveness with data visualizations by orders of magnitude.
Note
For more formal introduction to the idea behind D3 see the Declarative Language Design for Interactive Visualization paper published by Mike Bostock on IEEE InfoVis 2010 http://vis.stanford.edu/papers/protovis-design.
If you are interested to know how D3 came about, I recommend you to check out the D3: Data-Driven Document paper published by Mike Bostock on IEEE InfoVis 2011 at http://vis.stanford.edu/papers/d3.
Protovis, the predecessor of D3.js, also created by Mike Bostock and Jeff Heer of the Stanford Visualization Group can be found at http://mbostock.github.io/protovis/.