Specify controller and action for jQuery load event.

application.html.haml

!!!
%html
  %head

  %body{:class => params[:controller], :id => params[:action]}
    = yield

index.js

(function($) {
  $.start('lists#index', function() {
    console.log('lists controller - index action');
  });
})(jQuery);

jquery.start.js

(function($) {
  $.start = function(selector, callback) {
    var output = $(function() {
      if ($('body.'+selector).length) {
        callback();
      }
    });
    return output;
  };
})(jQuery);

lists.js

(function($) {
  $.start('lists', function() {
    console.log('lists controller');
  });
})(jQuery);