How to display all possible enum values in a dropdown list using Spring and Thymeleaf?

Question

I have a domain object that has an enum property and I want to display a dropdown list with all possible enum values in the form for this object. Imagine the following objec

Answer 1

You could do:

<select>
    <option th:each="state : ${T(com.mypackage.Ticket.State).values()}"
            th:value="${state}"
            th:text="${state}">
    </option>
</select>

Answer 2

this worked for me:

Java:

public enum RoleEnum {
    SUPER_ADMIN("SUPER_ADMIN"),
    RESTAURANTE_ADMIN("RESTAURANTE_ADMIN");

    private final String roleCode;

    private RoleEnum(String roleCode) {
        this.roleCode = roleCode;
    }
}

Thymeleaf:

<select class="form-control" id="val-skill" name="role_id">
    <option th:each="role : ${T(com.users.enumeration.RoleEnum).values()}" th:value="${role}" th:text="${role}"></option>
</select>

Answer 3

In addition, if you want to separate the enum ordinal name from the string displayed in the GUI, add additional properties, for example a displayName:

public static enum State {

    OPEN("open"),
    IN_WORK("in work"),
    FINISHED("finished");

    private final String displayName;

    State(String displayName) {
        this.displayName = displayName;
    }

    public String getDisplayName() {
        return displayName;
    }
}

And in the html file:

<select>
  <option th:each="state : ${T(com.mypackage.Ticket.State).values()}" th:value="${state}" th:text="${state.displayName}"></option>
</select>

This will present the displayName to the user and allows you to silently change this strings later without refactoring the code. You may add more properties like th:title this way.