如何使用Spring和Thymeleaf在下拉列表中显示所有可能的枚举值？ [英] How to display all possible enum values in a dropdown list using Spring and Thymeleaf?

问题描述

我有一个具有枚举属性的域对象，我希望在该对象的表单中显示一个包含所有可能枚举值的下拉列表。想象一下以下对象：

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 object:

public class Ticket {

  private Long id;

  private String title;

  private State state;

  // Getters & setters

  public static enum State {
    OPEN, IN_WORK, FINISHED
  }

}

在我的控制器中，我有一个为此对象呈现表单的方法：

In my controller I have a method that renders a form for this object:

@RequestMapping("/tickets/new")
public String showNewTicketForm(@ModelAttribute Ticket ticket) {
  return "tickets/new";
}

模板如下所示：

<form th:action="@{/tickets}" method="post" th:object="${ticket}">
  <input type="text" th:field="*{title}" />
  <select></select>
</form>

稍后应将其转换为以下内容：

Later it should be transformed to something like this:

<form action="/tickets" method="post">
  <input type="text" name="title" />
  <select name="state">
    <option>OPEN</option>
    <option>IN_WORK</option>
    <option>FINISHED</option>
  </select>
</form>

如何创建选择标记？所选值也应自动映射到票证，以便我可以在控制器中执行以下操作：

How can I create the select tag? The selected value should also be mapped to the ticket automatically so that I can do something like this in the controller:

@RequestMapping(value = "/tickets", method = RequestMethod.POST)
public String createTicket(@Valid Ticket ticket) {
  service.createTicket(ticket);

  return "redirect:/tickets";
}

推荐答案

你可以做：

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

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