create analytics tracking behavior

[steveoh]

on basemap layer switching

[steveoh]

This article seems like a good reference for trying to use the window global if it is available.

Things I would like to be able to do:

1. If analytics object is already in page use that analytic user id.
   • Gain insight on different types of users using things differently.
   • See all analytics for a widget event.
     • Will this require two tracking requests?
2. Turn on and off event tracking
   • This could be a nested require with a boolean property we could edit.
   • This could be an api call that we manage with a database.
   • I'm open to other ideas.

Events I would like to capture with this widget

1. Expanding the layer widget
   • This will tell us % of people who found the widget with their mouse based on total visits.
   • When a baselayer is changed.
     • Send new baselayer name.

Do we care about?

• When an overlay is turned on by the user
  • Send active baselayer name.
    • We can find out if people like the overlay tiles on other services.