Let’s work through some examples that will demonstrate some of the capabilities of D3, and enable you to begin solving some real-world problems immediately—if only by adapting the examples. The first two examples in this chapter will show you how to create standard scatter and xy-plots, complete with axes, from data files. The plots won’t be pretty, but will be fully functional, and it should be easy to tidy up their looks and to apply the concepts to other data sets. The third example is less complete. It is mostly a demo to convince you how easy it is to include event handling and animation in your documents.
To begin our exploration of D3, consider the small, straightforward data set in Example 2-1. Plotting this simple data set using D3 will already bring us in contact with many essential concepts.
x y 100 50 200 100 300 150 400 200 500 250
An HTML file or document, containing a DOM tree
Frequently, a file or other resource, containing the data set
Example 2-2 shows the HTML file in its entirety.