anchor.diff:      </tr>
    </table>
   <% end %>
  +
  +
  +<script>
  +  $(document).on("change", "#navigation_url", function(){
  +    if ($(this).val() == "other"){
  +        $("#other_url").show();
  +        $("#other_url").prop("disabled", false);
  +    }
  +    else{
  +        $("#other_url").hide();
  +        $("#other_url").prop("disabled", true);
  +    }
  +});
  +</script>
  
positive.code: 			<%= f.text_field :name %>
  		</td>
  	</tr>
  	<tr class="no=border">
  		<td class="no-border">
  			<%= f.label :url %>
  		</td>
  		<td class="no-border">
  			<%= f.select :url, Spree::Navigation.all.collect{|p| [p.url, p.url]}, include_blank: "None" %>
  		</td>
  	</tr>
  	 <tr>
      	<td class="no_border"></td>
  
negative.code: <%navigation = Spree::Navigation.all.collect{|p| [p.url, p.url]}%>
  <%navigation << ["other"]%>
  <%= form_for [:admin, @navigation] do |f| %>
  <%= select_tag "lang", options_for_select(["en", "pl"])%>
  <table class="no-border">
  