th:each的作用域问题

Question

一个table表格，在第一个td里面通过下标访问有语法提示且运行正常，在第二个td里面访问虽然有语法提示但是运行报错，报错
运行正常代码:
<table width="100%">

    <tr th:each="goods1,goodsIndex:${goods}" th:if="${goodsIndex.index}%2==0">

        <td width="50%">

            <table width="100%"><tr><td><img th:src="${goods[goodsIndex.index].getImg_src()}" /> <img th:src="${goods[goodsIndex.index].getImg_src()}" /></td></td></tr></table>

        </td>

        <td width="50%">

            <table width="100%"><tr><td></td></td></tr></table>

        </td>
        
    </tr>

</table>

运行错误代码：

<table width="100%">
    <tr th:each="goods1,goodsIndex:${goods}" th:if="${goodsIndex.index}%2==0">

        <td width="50%">

            <table width="100%"><tr><td><img th:src="${goods[goodsIndex.index].getImg_src()}" /></td></td></tr></table>

        </td>

        <td width="50%">

            <table width="100%"><tr><td> <img th:src="${goods[goodsIndex.index].getImg_src()}" /></td></td></tr></table>

        </td>

    </tr>

</table>

报错信息：

org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "goods[goodsIndex.index].getImg_src()" (template: "section" - line 27, col 47)

2021-03-02 11:10:59.980 ERROR 1332 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "goods[goodsIndex.index].getImg_src()" (template: "section" - line 27, col 47)] with root cause

Answer 1

th:each放在需要便利的容器的父容器中，然后子容器用其中的数据遍历。

实际用法可参考：https://www.cnblogs.com/SeaWxx/p/10276171.html