title: How can we create an onclick event for a d3 data map?
body: <p>I am building a d3 data map:
  <a href="http://datamaps.github.io/" rel="nofollow">http://datamaps.github.io/</a></p>
  
  <p>When I click on a country, I want the border to change color. How do I assign an onclick event to a d3 path using datamaps? The svg paths seem to lack a CSS ID as well as any identifying hook.</p>