What is the equivalent code in dojo for this snippet of jQuery?
$(".box").change(function() { }
Dojo uses Qt based connect/disconnect event handling.
dojo.query(".box").connect("onchange", function(){});
or more familiar to jQuery
dojo.query(".box").onchange(function(){});
see the section "events" in http://dojotoolkit.org/documentation/tutorials/1.6/using_query/