Question

我的下拉列表中有类似的问题没有显示任何值。喜欢解决方案：使用Thymeleaf和SpringBoot的下拉列表没有数据显示在下拉列表中。如果我查看IE调试器，我可以看到我的列表下拉列表，但下拉列表不会显示我的列表以供选择。 HTML代码段位于：

<div class="col-lg-3 selectContainer">
    <div class="input-group">
         <span class="input-group-addon"><i
         class="glyphicon glyphicon-list"></i></span> 
         <select th:field="*{savings_type}" name="savings_type_id" 
            id="savings_type_id" class="form-control selectpicker">
            <option value="">Select Savings Type</option>
            <option th:each="dropDownItem : ${leanTypesList}"
                    th:value="${dropDownItem.lt_id}"
                    th:text="${dropDownItem.lt_name}">
            </option>
        </select>
    </div>
</div>

此处的代码：我的模型leanDeatil.java - 填充Savings_Type字段的数据这也是值得的。

@Entity

@Table(name="lean_detail")

public class LeanDetail implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    //@Column (name="LEANDETAIL_ID")
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;

    @Column (name="SAVINGS_TYPE")
    private int savings_type;   

    @Column (name="SAVING_AMOUNT")
    private BigDecimal saving_amount;

    @Column (name="TITLE")
    private String title;

    @Column (nullable=true, name="IMPROVEMENT_DESC")
    private String improvement_desc;

    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "SAVINGS_TYPE", referencedColumnName = "lt_id",
    insertable = false, updatable = false)
    private LeanTypes leanTypes;

    public LeanDetail(){}

    public LeanDetail(String title,int savings_type, BigDecimal saving_amount,
        String improvement_desc {
     super();

     this.title = title;
     this.savings_type = savings_type;
     this.saving_amount = saving_amount;
     this.improvement_desc = improvement_desc;

  }
  getters and setters....

我的模型leanTypes.java数据来自

@Entity
@Table(name="lean_types")
public class LeanTypes {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column (name="LT_ID")
    private int lt_id;

    @Column (name="LT_NAME")
    private String lt_name;

    @Column (name="LT_DESC")
    private String lt_desc;

    @Column(nullable=false, name="LT_ACTV")
    private boolean lt_actv;

    @OneToMany(mappedBy="leanTypes", fetch=FetchType.EAGER)
    @Fetch(value = FetchMode.SUBSELECT)
    private List<LeanDetail> leanDetail = new ArrayList<LeanDetail>();

    public LeanTypes(){}

    public LeanTypes(int lt_id, String lt_name, String lt_desc, Boolean lt_actv) {
        super();
        this.lt_id = lt_id;
        this.lt_name = lt_name;
        this.lt_desc = lt_desc;
        this.lt_actv = lt_actv;
    }

    getters and setters....
}

来自我的Controller LeanDetail.java

@GetMapping("/update-leanDetail")
public String updateLeanDetail(@RequestParam int id, HttpServletRequest
     request){  
   request.setAttribute("leanTypesList", leanTypesService.findAll());
   request.setAttribute("leanDetail", leanDetailService.findLeanDetail
     (id));
   request.setAttribute("mode", "MODE_UPDATE");
   return "leanDetail";
}

Thymeleaf和SpringBoot的下拉列表中没有值

0 个答案: