Question

I am rendering my main top navigation in a loop in Rails 3:

<ul>
<% Placement.all.each do |placement| %>
  <li><%= link_to placement.placementname, placement_path(placement.id)%> </li>
<%end%>
</ul>

How can I highlight the background of the current placement based on the id in the url? the url looks like this:
localhost:3000/placements/1
localhost:3000/placements/2
…

Once the user clicks on one of those tabs a second navigation bar will appear on the left side. This is how I am rendering it:

<% @placement.ads.all.each do |ad| %>
    <li><%= link_to ad.adname, placement_ad_path(@placement, ad) %> </li>
<%end%>

How can I highlight the background of the current ad based on the id in the url? the url looks like this: localhost:3000/placements/1/ads/1
localhost:3000/placements/2/ads/3
…

Answer 1

<ul>
 <% Placement.all.each do |placement| %>
   <li class=<%= "highlighted" if placement.id==params[:id].to_i %>>
       <%= link_to placement.placementname, placement_path(placement.id)%> </li>
 <%end%>
</ul>

and

<% @placement.ads.all.each do |ad| %>
  <li class=<%= "highlighted" if ad.id==params[:id].to_i %>>
    <%= link_to ad.adname, placement_ad_path(@placement, ad) %> </li>
<%end%>