如何在嵌套<jt:forEach>中使用<jt:span />标签？解析报错咨询

Hey there! To cut straight to the point: yes, <jt:span /> works perfectly fine inside nested <jt:forEach> loops. That parse error you're seeing is almost definitely a syntax mistake in how you're structuring your tags, not a restriction of these JSTL-style components.

Let's walk through the most common pitfalls that cause this error, plus a working example to get you back on track:

Common Syntax Issues Triggering Parse Errors #

• Unclosed or mismatched tags
  This is the #1 culprit. Make sure every tag is properly closed—especially self-closing tags like <jt:span /> (don't forget the trailing /). For example, this broken code will throw a parse error:

  <jt:forEach var="outer" items="${outerList}">
      <jt:forEach var="inner" items="${outer.innerList}">
          <!-- Missing closing / here -->
          <jt:span value="${inner.data}"
      </jt:forEach>
  </jt:forEach>
  

  Fix it by ensuring the span is self-closed: <jt:span value="${inner.data}" />

• Invalid attribute formatting
  Always wrap attribute values in quotes, and double-check that your EL expressions (${}) are properly formatted. This broken line will fail:

  <jt:span value=${inner.data} /> <!-- Missing quotes around the value -->
  

  Correct version: <jt:span value="${inner.data}" />

• Typos in tag names
  A tiny typo like <jt:foreach> (lowercase 'f') instead of <jt:forEach> can also trigger parse errors—case matters here!

Working Example #

Here's a clean, valid snippet that uses nested loops with <jt:span /> without any issues:

<!-- Nested loops with jt:span - no parse errors! -->
<jt:forEach var="department" items="${company.departments}">
    <h4>${department.name}</h4>
    <jt:forEach var="employee" items="${department.employees}">
        <jt:span value="${employee.firstName}" />
        <jt:span value=" ${employee.lastName}" />
        <jt:span value=" | ${employee.role}" />
        <br/>
    </jt:forEach>
</jt:forEach>

If you're still hitting the error after fixing these points, double-check your template for stray characters, unescaped special characters in attribute values (like <, >, or &—use <, >, & if needed), or conflicting variable names between the outer and inner loops (though that would cause a runtime error, not a parse error).

内容的提问来源于stack exchange，提问作者Tuong Luong