I have this remote js code

<% if @error_message.present? %>
$('#message').html('<div class="text-danger"><%= j @error_message %></div>');
<% elsif @success_message.present? %>
location.search += "&coupon_id=<%= @coupon.id %>";
localStorage.setItem('success_message', "<%= @success_message %>");
localStorage.setItem('coupon_code', "<%= @coupon.code %>");
setTimeout(function(){
  localStorage.removeItem('coupon_code');
  localStorage.removeItem('success_message');
}, 300 * 1000);
<% end %>

some tip why setTimeout is not working?