In the previous chapter, we explored how to create graphs in order to publish in print or online by creating PNGs. Of course, the Internet can do a lot more than publish static images. Much of the power of the Internet lies in the fact that it's interactive. Adding rich data visualizations to the web's interactions makes a powerful environment in which you can explore and gain insights into the questions you're researching. In this chapter, we'll explore how to create a full web application using Clojure, including interactive graphs.

First, we'll set up a web application with Ring (https://github.com/ring-clojure/ring) and Compojure (http://compojure.org). Ring is an interface between web servers and web applications. Compojure is a small web framework that provides a convenient way to define and handle routes (the associations between URLs and functions to provide data for them).

Next, we'll see how to use Hiccup (https://github.com/weavejester/hiccup) in order to generate HTML...