How to do if-else in Thymeleaf?

Thymeleaf has an equivalent to <c:choose> and <c:when>: the th:switch and th:case attributes introduced in Thymeleaf 2.0.

They work as you'd expect, using * for the default case:

<div th:switch="${user.role}">   <p th:case="'admin'">User is an administrator</p>  <p th:case="#{roles.manager}">User is a manager</p>  <p th:case="*">User is some other thing</p> </div>

See this for a quick explanation of syntax (or the Thymeleaf tutorials).

Disclaimer: As required by StackOverflow rules, I'm the author of Thymeleaf.

I tried this code to find out if a customer is logged in or anonymous. I did using the th:if and th:unless conditional expressions. Pretty simple way to do it.

<!-- IF CUSTOMER IS ANONYMOUS --><div th:if="${customer.anonymous}">   <div>Welcome, Guest</div></div><!-- ELSE --><div th:unless="${customer.anonymous}">   <div th:text=" 'Hi,' + ${customer.name}">Hi, User</div></div>

I'd like to share my example related to security in addition to Daniel Fernández.

<div th:switch="${#authentication}? ${#authorization.expression('isAuthenticated()')} : ${false}">    <span th:case="${false}">User is not logged in</span>    <span th:case="${true}">Logged in user</span>    <span th:case="*">Should never happen, but who knows...</span></div>

Here is complex expression with mixed 'authentication' and 'authorization' utility objects which produces 'true/false' result for thymeleaf template code.

The 'authentication' and 'authorization' utility objects came from thymeleaf extras springsecurity3 library.When 'authentication' object is not available OR authorization.expression('isAuthenticated()') evaluates to 'false', expression returns ${false}, otherwise ${true}.