英文:
Don't process the each case when if case is true in thymeleaf
问题
以下是翻译好的内容：
我正在开发一个 Spring Boot 应用程序。我有以下 Thymeleaf 块：
<Produkt th:if="${visibility}" th:each="user: ${userList.myList}">
<Name th:text="${user.name}"/>
</Produkt>
我有以下 Java 代码：
@Test
public void myTest() {
Context context = new Context();
Map<String, List<Map<String, String>>> userValuesList = new HashMap<>();
boolean visibility = getVisibility();
if (visibility) {
List<Map<String, String>> vv = new ArrayList<>();
Map<String, String> map = new HashMap<>();
map.put("name", "filip");
vv.add(map);
Map<String, String> map2 = new HashMap<>();
map2.put("name", "test");
vv.add(map2);
userValuesList.put("myList", vv);
}
context.setVariable("visibility", visibility);
context.setVariable("userList", userValuesList);
springTemplateEngine.process("test.xml", context);
}
因为我只在 visibility 为 true 时添加这个 myList，我得到了以下错误：
**在评估 SpringEL 表达式时出现异常："userList.myList"**
我的问题是，是否可能仅在 visibility 为 true 时由 springTemplateEngine 处理这个 userList.myList？
我想要实现的最终结果是：
<Produkt>
<Name>filip</Name>
</Produkt>
<Produkt>
<Name>test</Name>
</Produkt>
如果 visibility 为 false，在这种情况下，整个 Produkt 标签都会消失。
英文:
I am working on a spring boot application. I have the following thymeleaf block:
<Produkt th:if="${visibility}" th:each="user: ${userList.myList}">
<Name th:text="${user.name}"/>
</Produkt>
I have the following java code:
@Test
public void myTest() {
Context context = new Context();
Map<String, List<Map<String, String>>> userValuesList = new HashMap<>();
boolean visibility = getVisibility();
if (visibility) {
List<Map<String, String>> vv = new ArrayList<>();
Map<String, String> map = new HashMap<>();
map.put("name", "filip");
vv.add(map);
Map<String, String> map2 = new HashMap<>();
map2.put("name", "test");
vv.add(map2);
userValuesList.put("myList", vv);
}
context.setVariable("visibility", visibility);
context.setVariable("userList", userValuesList);
springTemplateEngine.process("test.xml", context);
}
Since I am adding this myList only when visibility is true, I am getting the following error:
Exception evaluating SpringEL expression: "userList.myList"
My question is is it possible for this userList.myList to be processed by the springTemplateEngine only if visibility is true ?
The end result that I want to achieve is:
<Produkt>
<Name>filip</Name>
</Produkt>
<Produkt>
<Name>test</Name>
</Produkt>
and in case if visbility is false, this whole Produkt tag to be gone.
答案1
得分: 1
Thymeleaf的`th:each`属性的优先级高于`th:if`属性。所有Thymeleaf属性都定义了一个数值优先级，该优先级确定了它们在标签中执行的顺序。要实现您的要求，只需在其自己的标签中使用`th:if`属性，该标签将作为包含`th:each`属性的标记的容器...
<div th:if="${visibility}">
<Produkt th:each="user: ${userList.myList}">
<Name th:text="${user.name}"/>
</Produkt>
</div>
<details>
<summary>英文:</summary>
Thymeleaf `th:each` attribute has higher [precedence][1] than `th:if` attribute. All Thymeleaf attributes define a numeric precedence, which establishes the order in which they are executed in the tag. To achieve your requirements just use `th:if` attribute in it's own tag which will be a container to the tag with `th:each` attribute ...
<div th:if="${visibility}">
<Produkt th:each="user: ${userList.myList}">
<Name th:text="${user.name}"/>
</Produkt>
</div>
[1]: https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#attribute-precedence
</details>
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