tracks/app/views/login/login.html.erb

<% auth_schemes = Tracks::Config.auth_schemes
   show_database_form = auth_schemes.include?('database') || auth_schemes.include?('ldap')
   show_openid_form = auth_schemes.include?('open_id')
   show_cas_form = auth_schemes.include?('cas')
-%>

<div title="Account login" id="loginform" class="form">

  <%= render_flash %>

  <h3>Please log in to use Tracks:</h3>
<% if show_database_form %>
  <div id="database_auth_form" style="display:<%=(@prefered_auth.eql?('database')) ? "block" : "none"%>">
      <% form_tag :action=> 'login' do %>
        <table>
          <tr>
            <td><label for="user_login">Login:</label></td>
            <td><input type="text" name="user_login" id="user_login" value="" class="login_text" /></td>
          </tr>
          <tr> 
            <td><label for="user_password">Password:</label></td>
            <td><input type="password" name="user_password" id="user_password" class="login_text" /></td>
          </tr>
         <tr> 
            <td><label for="user_noexpiry">Stay logged in:</label></td>
            <td><input type="checkbox" name="user_noexpiry" id="user_noexpiry" checked  /></td>
          </tr>
          <tr> 
            <td></td>
            <td><input type="submit" name="login" value="Sign In &#187;" class="primary" /></td>
          </tr>
        </table>
      <% end %>
  </div>
<% end %>

<% if show_openid_form %>
  <div id="openid_auth_form" style="display:<%=(@prefered_auth.eql?('openid')) ? "block" : "none"%>">
    <% form_tag :action=> 'login' do %>
      <table>
        <tr>
          <td><label for="openid_url">Identity URL:</label></td>
          <td><input type="text" name="openid_url" id="openid_url" value="<%= @openid_url %>" class="login_text open_id" /></td>
        </tr>
       <tr> 
          <td><label for="user_noexpiry">Stay logged in:</label></td>
          <td><input type="checkbox" name="user_noexpiry" id="user_noexpiry" checked  /></td>
        </tr>
        <tr> 
          <td></td>
          <td><input type="submit" name="login" value="Sign In &#187;" class="primary" /></td>
        </tr>
      </table>
    <% end %>
  </div>
 <% end %>

<% if show_cas_form %>
  <div id="cas_auth_form" style="display:<%=(@prefered_auth.eql?('cas')) ? "block" : "none"%>">
      <table>
        <tr>
          <td>	
			<% if @username && @user%>
			  <p>Hello, <%= @username %>! You are authenticated.</p>
			<% elsif @username %>
			  <p>Hello, <%= @username %>! You do not have an account on Tracks.
                <%if SITE_CONFIG['open_signups']%>
                   If you like to request on please go here to <%= link_to "Request Account" , signup_url %>
                <%end%>
              </p>
			<% else %>
			  <p><%= link_to("CAS Login", login_cas_url) %>  </p>
			<% end %>
			</td>
        </tr>
      </table>
  </div>
 <% end %>
 
</div>
<% if show_openid_form %><p id="alternate_auth_openid" class="alternate_auth">or, <a href="#" onclick="Login.showOpenid();return false;">login with an OpenId</a></p><% end %>
<% if show_database_form %><p id="alternate_auth_database" class="alternate_auth">or, <a href="#" onclick="Login.showDatabase();return false;">go back to the standard login</a></p><% end %>
<% if show_cas_form %><p id="alternate_auth_cas" class="alternate_auth">or, <a href="#" onclick="Login.showCAS();return false;">go to the CAS</a></p><% end %>

<script type="text/javascript">
function showPreferredAuth() {
  var preferredAuth = $.cookie('preferred_auth');
  var casEnabled = <%= show_cas_form ? 'true' : 'false' %>;
  var databaseEnabled = <%= show_database_form ? 'true' : 'false' %>;
  var openidEnabled = <%= show_openid_form ? 'true' : 'false' %>;
	if (preferredAuth && preferredAuth == 'openid' && openidEnabled) {
	  Login.showOpenid();
	}
	else if (preferredAuth && preferredAuth == 'database' && databaseEnabled)  {
	  Login.showDatabase();
	}
	else if (preferredAuth && preferredAuth == 'cas' && casEnabled)  {
	  Login.showCAS();
	}
}
$(document).ready(showPreferredAuth);

var Login = {
    showOpenid: function() {
        $('#database_auth_form').hide();
        $('#openid_auth_form').show();
        $('#alternate_auth_openid').hide();
        $('#alternate_auth_database').show();  ;
        $('#alternate_auth_cas').show();
        $('#openid_url').focus();
        $('#openid_url').select();
        $.cookie('preferred_auth', 'openid');
    },

    showDatabase: function(container) {
        $('#openid_auth_form').hide();
        $('#database_auth_form').show();
        $('#alternate_auth_database').hide();
        $('#alternate_auth_openid').show();
        $('#alternate_auth_cas').show();
        $('#user_login').focus();
        $('#user_login').select();
        $.cookie('preferred_auth', 'database');
    },
    showCAS: function(container) {
        $('#database_auth_form').hide();
        $('#openid_auth_form').hide();
        $('#cas_auth_form').show();
        $('#alternate_auth_cas').hide();
        $('#alternate_auth_openid').show();
        $('#alternate_auth_database').show();
        $.cookie('preferred_auth', 'cas');
    }

}

</script>