如何在 JSTL EL 测试中测试枚举值？

发布于 2024-12-02 01:55:47 字数 754 浏览 0 评论 0原文

我的 JSP 中有以下块，它将 ENUM 值 {CREATE, CREATE_FROM_CAMPAIGN, OPEN} 转换为漂亮、可读的状态文本。

由于某种原因，针对 'CREATE' 的第一个测试有效，但针对 'CREATE_FROM_CAMPAIGN' 的测试却不起作用。

<c:choose>
    <c:when test="${entry.activity eq 'CREATE'}">
        <td>was created</td>
    </c:when>
    <c:when test="$(entry.activity eq 'CREATE_FROM_CAMPAIGN'}">
        <td>was created from campaign</td>
    </c:when>
    <c:otherwise>
        <td>was opened (${entry.activity}) </td>
    </c:otherwise>
</c:choose>

该输出的一项输出如下：

已打开 (CREATE_FROM_CAMPAIGN)
已打开（OPEN）

为什么第二个测试不起作用？

原文

I have the following block in my JSP, which converts from ENUM values {CREATE, CREATE_FROM_CAMPAIGN, OPEN} into nice, readable status texts.

For some reason the first test against 'CREATE' works, but the test against the 'CREATE_FROM_CAMPAIGN' does not.

<c:choose>
    <c:when test="${entry.activity eq 'CREATE'}">
        <td>was created</td>
    </c:when>
    <c:when test="$(entry.activity eq 'CREATE_FROM_CAMPAIGN'}">
        <td>was created from campaign</td>
    </c:when>
    <c:otherwise>
        <td>was opened (${entry.activity}) </td>
    </c:otherwise>
</c:choose>

One output from this one is as follows:

was opened (CREATE_FROM_CAMPAIGN)
was opened (OPEN)

Why does the second test not work?

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风苍溪 2024-12-09 01:55:47

它不起作用，因为您使用 $( 而不是 ${ 来启动表达式。

相应地修复它：

<c:choose>
    <c:when test="${entry.activity eq 'CREATE'}">
        <td>was created</td>
    </c:when>
    <c:when test="${entry.activity eq 'CREATE_FROM_CAMPAIGN'}">
        <td>was created from campaign</td>
    </c:when>
    <c:otherwise>
        <td>was opened (${entry.activity}) </td>
    </c:otherwise>
</c:choose>

It does not work because you used $( instead of ${ to start the expression.

Fix it accordingly:

<c:choose>
    <c:when test="${entry.activity eq 'CREATE'}">
        <td>was created</td>
    </c:when>
    <c:when test="${entry.activity eq 'CREATE_FROM_CAMPAIGN'}">
        <td>was created from campaign</td>
    </c:when>
    <c:otherwise>
        <td>was opened (${entry.activity}) </td>
    </c:otherwise>
</c:choose>

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