Thymeleaf和#fields.hasErrors [英] Thymeleaf and #fields.hasErrors

问题描述

我正在为学校工作.使用SpringMVC，Hibernate JPA和Thymeleaf.下面的代码包含一个称为"stringGrade"的特定属性.我想使用Hibernate Validator验证该字段中的输入.我似乎无法让Thymeleaf读取该表达.在视图中循环的arrayList的名称属性为"deliveryables [0] .stringGrade"，依存在的数量而定.我尝试使用"deliveryables [ $ {stat.index} ].name"，这导致Thymeleaf失败，并显示以下错误:

I have this assignment I am working on for school. Using SpringMVC, Hibernate JPA, and Thymeleaf. The following code below involves a specific attribute called " stringGrade ". I want to validate the input in that field using Hibernate Validator. I cannot seem to get Thymeleaf to read the expression. The arrayList that is looped in the view has a name attribute of " deliverables[0].stringGrade " and so on depending on how many there are. I have tried using " deliverables[${stat.index}].name " and this causes Thymeleaf to fail with this error:

HTTP状态500-请求处理失败；嵌套的异常是org.thymeleaf.exceptions.TemplateProcessingException:评估SpringEL表达式的异常:#fields.hasErrors('deliverables [0] .stringGrade')"(menuItems/inputGrades:33)

HTTP Status 500 - Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#fields.hasErrors('deliverables[0].stringGrade')" (menuItems/inputGrades:33)

我要做的就是让Thymeleaf能够使用#fields.HasErrors和#fields.error读取值.以下是相关的代码:

All I want to do is have Thymeleaf be able to read the value using #fields.HasErrors and #fields.error. Below is the code that is relevant:

GradeCalculator模型:

GradeCalculator Model:

public class GradeCalculator {

private ArrayList<Deliverable> deliverables;

交付模型:

@Entity
@Table(name="Deliverables")
public class Deliverable implements Serializable {


@NotEmpty(message = "Required")
@Size(min = 1, max = 100, message = "Must be between 1 and 100")
@Digits(integer = 3, fraction = 0, message = "Must be a numeric value")
private String stringGrade; // String version of the grade ( Used for view input fields )

百里香叶视图:

<form th:object="${gradeCalculator}" action="#" th:action="@{/process/inputGrades}" method="POST" class="form-horizontal" role="form">

    <div th:each="deliverable,stat : ${grades.deliverables}">
        <div class="form-group">
            <p>Deliverable Name<span th:text="${grades.deliverables[__${stat.index}__].name}" name="name" id="name" class="badge tab-space"></span></p>
            <p>Deliverable Weight<span th:text="${grades.deliverables[__${stat.index}__].weight}" name="weight" id="weight" class="badge tab-space"></span></p>

            <h3><span class="label">Grade:</span></h3>

            <input type="text" th:field="${grades.deliverables[__${stat.index}__].stringGrade}" class="form-control" />
            <ul class="help-inline" th:if="${#fields.hasErrors('deliverables[__${stat.index}__].stringGrade')}">
                <li class="error" th:each="err : ${#fields.errors('deliverables[__${stat.index}__].stringGrade')}" th:text="${err}">Input is incorrect</li>
            </ul>
        </div>
    </div>

    <div class="form-group">
        <div class="text-center col-sm-10 col-sm-offset-2 col-md-4 col-md-offset-4">
                <button type="submit" class="btn btn-primary">Submit</button>
        </div>
    </div>

</form>

推荐答案

找到了答案.我没有使用Thymeleaf变量表达式正确处理"deliveryables [ $ {stat.index} ].stringGrade".我应该一直在这样做:

Found the answer. I was not processing " deliverables[${stat.index}].stringGrade " correctly by using the Thymeleaf variable expression. I should have been doing this:

<ul class="help-inline" th:if="${#fields.hasErrors('${grades.deliverables[__${row.index}__].stringGrade}')}">
    <li
      class="error"
      th:each="err : ${#fields.errors('${grades.deliverables[__${row.index}__].stringGrade}')}" 
      th:text="${err}">
        Input is incorrect
    </li>
</ul>

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