Javascript if condition for RoR

I am trying to use Javascript in my RoR4 app.

The problem I have is that when there are 2 if-conditions, the second one always get executed even it shouldn't be.

Here is my code:

$(document).ready(function() {
if (document.body.contains('individual'))
{
    alert('first');    
} else if (document.body.contains('main'))
  {
    <% if current_user.activated%>
        alert('not activated');
    <% else %>
        alert('activated');
    <% end %>
  }
})