An example for using Errai Security to hide @datafields based on a user's login-status and roles.

NavBar.html

<div>
  <a id="admin">Admin Only Link</a>
  <a id="logout">Logout Link</a>
</div>

NavBar.java

@Templated
public class NavBar extends Composite {
  
  @Inject @DataField
  @RestrictedAccess(roles = "admin")
  private Anchor admin;
  
  @Inject @DataField
  @RestrictedAccess
  private Anchor logout;
}

style.css

#admin, #logout.errai-restricted-access-style {
  visibility: visible;
}
#admin.errai-restricted-access-style, #logout {
  visibility: hidden;
}