Question

我想在select选项（Thymeleaf）中添加一个th：text，

<option th:each="case : ${caseCategoryList}" th:value="${case.caseCategoryId}" th:text="${case.caseCategoryName} - ${case.caseCategoryCode}"></option>

但我收到此错误

08:28:05,501 ERROR [[servlet-context]] Servlet.service() for servlet servlet-context threw exception
        org.thymeleaf.exceptions.TemplateProcessingException: Cannot execute subtraction: operands are "INPATIENT" and "IP" (memberrki/member-rki-form:124)
            at org.thymeleaf.standard.expression.SubtractionExpression.executeSubtraction(SubtractionExpression.java:91)
            at org.thymeleaf.standard.expression.ComplexExpression.executeComplex(ComplexExpression.java:58)
            at org.thymeleaf.standard.expression.Expression.execute(Expression.java:107)
            at org.thymeleaf.standard.expression.Expression.execute(Expression.java:133)
            at org.thymeleaf.standard.expression.Expression.execute(Expression.java:120)
            at org.thymeleaf.standard.processor.attr.AbstractStandardTextChildModifierAttrProcessor.getText(AbstractStandardTextChildModifierAttrProcessor.java:68)
            at org.thymeleaf.processor.attr.AbstractTextChildModifierAttrProcessor.getModifiedChildren(AbstractTextChildModifierAttrProcessor.java:59)
            at org.thymeleaf.processor.attr.AbstractChildrenModifierAttrProcessor.processAttribute(AbstractChildrenModifierAttrProcessor.java:58)
            at org.thymeleaf.processor.attr.AbstractAttrProcessor.doProcess(AbstractAttrProcessor.java:87)
            at org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:212)
            at org.thymeleaf.dom.Node.applyNextProcessor(Node.java:1016)
            at org.thymeleaf.dom.Node.processNode(Node.java:971)
             ...

你可以帮我解决这个错误，

Answer 1

Thymeleaf正在解释这个：th:text="${case.caseCategoryName} - ${case.caseCategoryCode}"，因为从caseCategoryName中减去caseCategoryCode的值，以显示结果。

并且，由于这些是String值，因此减法失败。

我怀疑你根本不想减去它们，而是想要显示用连字符分隔的两个vaues。像这样：

INPATIENT - IP

要做到这一点，你可以转义连字符，以便Thymeleaf不将它视为减法运算符：

th:text="${case.caseCategoryName} &#45; ${case.caseCategoryCode}"

Answer 2

按照glytching的建议使用&#45对我不起作用。但是，这可行：

th:text="${case.caseCategoryName} + '-' + ${case.caseCategoryCode}"

Thymeleaf无法执行减法：

2 个答案: