html - 如果登录为真，如何隐藏另一个 html 按钮？

Question

这里有两个按钮选项卡: 如何表达

1:

<% if logged_in? %>然后隐藏 b 按钮标签

2:

<% if studentlogged_in? %>然后隐藏A按钮标签

两种方法 <% if logged_in? %> , <% if studentlogged_in? %>有效

 <% if logged_in? %>  <<==#A button tab
   <li><%= link_to "Users", users_path %></li>
   <li class="dropdown">
     <a href="#" class="dropdown-toggle" data-toggle="dropdown">
       Account <b class="caret"></b>
     </a>
     <ul class="dropdown-menu">
       <li><%= link_to "Profile", current_user %></li>
       <li><%= link_to "Settings", edit_user_path(current_user) %></li>
       <li class="divider"></li>
       <li>
         <%= link_to "Log out", logout_path, method: "delete" %>
       </li>
     </ul>
   </li>
 <% else %>
   <li><%= link_to "Tutor Center",  login_path %></li>
 <% end %>



 <% if studentlogged_in? %>  <<==#B button tab
   <li><%= link_to "StudentUsers", student_users_path %></li>
   <li class="dropdown">
     <a href="#" class="dropdown-toggle" data-toggle="dropdown">
       Account <b class="caret"></b>
     </a>
     <ul class="dropdown-menu">
       <li><%= link_to "Profile", studentcurrent_user %></li>
       <li>
         <%= link_to "Settings", edit_user_path(studentcurrent_user) %>
       </li>
       <li class="divider"></li>
       <li>
         <%= link_to "Log out", studentlogout_path, method: "delete" %>
       </li>
     </ul>
   </li>
 <% else %>
   <li><%= link_to "Student Center",  studentlogin_path %></li>
 <% end %>

Answer 1

也许你的意思是这个结构:

<% if studentlogged_in? %>
   ...
<% elsif logged_in? %>
   ...
<% end %>

哪里显示学生版、普通版或什么都不显示，但绝不会同时显示两者。