This article describes how to add the Ajax in-progress indicators to Ruby on Rails application.
When the user clicks the "Get Results" link she has no idea that the page is communicating with the server. While the communication doesn't go on forever, an impatient user might click the link multiple times.
So, we need a way of letting the user know that something is happening and that they ought to wait a bit. Today, the standard seems to be an animated spinning icon. This means we're waiting for a return back from the server. 
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