Thymeleaf 中的 If-Else:each 语句 [英] If-Else in a th:each statement in Thymeleaf

问题描述

我想要的是 Thymeleaf 中 th:each 语句中的 if-else.

如果currentSkill != null，则显示包含内容的表格，否则'您没有任何技能'

这是没有 if/else 的代码:

<表格><tr><td th:text="${skill.name}"/></tr>

解决方案

<表格><tr th:each="skill : ${currentSkills}"><td th:text="${skill.name}"/></tr>
<div th:if="${currentSkills == null}">你没有任何技能

如果 currentSkills 是一个列表，您可以像这样使用 #lists 实用程序(这比上面的代码更正确，因为它还考虑了以下可能性对象不为空而是为空):

 
<表格><tr th:each="skill : ${currentSkills}"><td th:text="${skill.name}"/></tr>
<div th:if="${#lists.isEmpty(currentSkills)}">你没有任何技能

如果 currentSkills 是一个数组，你也可以这样做，只需将 #lists 替换为 #arrays.

请注意，在这两种情况下，isEmpty() 都会返回 true，无论对象为 null 还是具有零个项目.

What I want is an if-else in a th:each statement in Thymeleaf.

If currentSkill != null, then show table with content, else 'You don't have any skills'

This is the code without the if/else:

<div th:each="skill : ${currentSkills}">
    <table>
         <tr><td th:text="${skill.name}"/></tr>
    </table>
</div>

解决方案

<div  th:if="${currentSkills != null}">
    <table>
         <tr th:each="skill : ${currentSkills}"><td th:text="${skill.name}"/></tr>
    </table>
</div>
<div th:if="${currentSkills == null}">
   You don't have any skills
</div>

If currentSkills is a list, you can use the #lists utility like so (which is more correct than the above code since it also takes into account the possibility where the object is not null but is empty):

 <div  th:if="!${#lists.isEmpty(currentSkills)}">
    <table>
         <tr th:each="skill : ${currentSkills}"><td th:text="${skill.name}"/></tr>
    </table>
</div>
<div th:if="${#lists.isEmpty(currentSkills)}">
   You don't have any skills
</div>

You could do the same if currentSkills is an array by just replacing #lists with #arrays.

Note that in both cases isEmpty() returns true whether the object is null or has zero items.

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