Thymeleaf不能执行减法：

Question

我想在select option (Thymeleaf)中添加一个th:text，

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

但是我得到了这个错误

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)
             ...

你能帮我修复这个错误吗？

Answer 1

使用glytching建议的&#45对我不起作用。然而，这是可行的：

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

Answer 2

百里香解释说：th:text="${case.caseCategoryName} - ${case.caseCategoryCode}" as从caseCategoryName中减去caseCategoryCode的值来显示结果。

而且，因为这些是字符串值，所以减法会失败。

我怀疑您根本不想减去它们，而是希望显示由连字符分隔的两个值。如下所示：

INPATIENT - IP

为此，您可以转义连字符，以便Thymeleaf不会将其视为减法运算符：

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