app/views/case_types/show.js.erb
<% if @case_type.requires_trial_dates? %>
$('#trial-details').slideDown();
<% else %>
$('#trial-details').hide();
<% end %>
<% if @case_type.requires_retrial_dates? %>
$('#retrial-details').slideDown();
<% else %>
$('#retrial-details').hide();
<% end %>