如何使用百里香和春天用列表填充下拉列表

Question

我需要使用字符串列表中的所有值填充下拉列表。

控制器类

@RequestMapping(value = "/generateIds", method = RequestMethod.GET)
public String launchPage(Model model) {
    List<Municipality> municipalities = rCountryService.finaAllMunicipalities();
    //assume the list is populated with values
    List<String> countryName = new ArrayList<String>();
    for(int i=0; i<municipalities.size(); i++) {
        countryName.add(municipalities.get(i).getCountry().toString());
    }
    model.addAttribute("countryName ", countryName );

    return "generateIds";
}

我不知道从何处开始HTML，所以我从这里开始

<select th:field="*{countryName }">
    <option value="default">Select a country</option>
    <option th:each="${countryName }" th:value="${countryName }"th:text="${countryName }"/>
</select>

我的html / controller应该如何将列表的所有元素添加为下拉选项？

提前致谢！

Answer 1

这就是我填充下拉列表的方式。我认为这可能有助于您有所了解。

控制者

List<Operator> operators =  operatorService.getAllOperaors()
model.addAttribute("operators", operators);

模型

  @Entity
  @Table(name = "operator")
  public class Operator {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    @JsonIgnore
    private Long id;

    @NotBlank(message="operator Name cannot be empty")
    @Column(name = "operator_name", nullable = false)
    private String operatorName;

    getters and setters ...

}

视图

<div class="form-group blu-margin">
    <select class="form-control" th:field="${operator.opeId}"  id="dropOperator">
    <option value="0">select operator</option>
    <option th:each="operator : ${operators}" th:value="${operator.id}" th:text="${operator.operatorName}"></option>
    </select>
</div>