How to compare the enum constants in Thymeleaf

January 04, 2020 No comments Thymeleaf Enum Compare QA

1. Introduction

In this article, we are going to show how to compare the enum constants in Thymeleaf. We will use special T syntax available in Spring Expression Language (Sp EL) to access a class-level field or method.

If you need more information about how to use conditions in Thymeleaf, follow below links:
Conditions in Thymeleaf
Using Enums in Thymeleaf
Display enums in Thymeleaf

2. Comparing enum constants

Let's consider we have the following enum structure that contains days of the week:

package com.frontbackend.thymeleaf.enums.model;

public enum DayOfTheWeek {

We can use T() syntax to get the static fields from enum object. The following template will render <span>Weekend</span> tag if the expression under ${day} will evaluate to SATURDAY or SUNDAY:

<span th:if="${day == T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).SATURDAY or day == T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).SUNDAY}" th:text="Weekend"></span>

The below example shows how to use enum values in th:switch-th:case statements:

<th:block th:switch="${day}">
    <span th:case="${T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).MONDAY}">work</span>
    <span th:case="${T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).TUESDAY}">work</span>
    <span th:case="${T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).WEDNESDAY}">work</span>
    <span th:case="${T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).THURSDAY}">work</span>
    <span th:case="${T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).FRIDAY}">work</span>
    <span th:case="${T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).SATURDAY}">weekend</span>
    <span th:case="${T(com.frontbackend.thymeleaf.enums.model.DayOfTheWeek).SUNDAY}">weekend</span>

3. Conclusion

In this short article, we presented the methods to compare enum constant values in Thymeleaf templates. We used the special T syntax available in Spring EL. It can be used to retrieve any static field or method from the Java objects.

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