在JSP EL中连接字符串？ [英] Concatenate strings in JSP EL?

问题描述

我有一个bean列表，每个bean都有一个属性，它本身就是一个电子邮件地址列表。

I have a List of beans, each of which has a property which itself is a List of email addresses.

<c:forEach items="${upcomingSchedule}" var="conf">
    <div class='scheduled' title="${conf.subject}" id="scheduled<c:out value="${conf.id}"/>">
    ...
    </div>
</c:forEach>

这会产生一个< div> 每个列表中的bean。

This renders one <div> per bean in the List.

对于子列表，我希望能够连接列表中的每个条目以形成单个String，显示为< div> 的标题属性的一部分。为什么？因为我们使用javascript库（mootools）将此< div> 转换为浮动工具提示，并且库转为标题进入工具提示的文本。

For the sublist, what I'd like to be able to do is to concatenate each of the entries in the list to form a single String, to be displayed as a part of the <div>'s title attribute. Why? Because we are using a javascript library (mootools) to turn this <div> into a floating tool tip, and the library turns the title into the text of the tooltip.

因此，如果 $ {conf.subject} 是主题，最终我希望< div> 的标题为主题：blah @ blah.com，blah2 @ blah2.com等，包含子列表的所有电子邮件地址。

So, if ${conf.subject} was "Subject", ultimately I'd like the title of the <div> to be "Subject: [e-mail], [e-mail], etc.", containing all of the email addresses of the sub-list.

如何使用JSP EL执行此操作？我试图远离在jsp文件中放置scriptlet块。

How can I do this using JSP EL? I'm trying to stay away from putting scriptlet blocks in the jsp file.

推荐答案

想出一个有点脏的方法来做这个：

Figured out a somewhat dirty way to do this:

<c:forEach items="${upcomingSchedule}" var="conf">
    <c:set var="title" value="${conf.subject}: "/>
    <c:forEach items="${conf.invitees}" var="invitee">
        <c:set var="title" value="${title} ${invitee}, "/>
    </c:forEach>
    <div class='scheduled' title="${title}" id="scheduled<c:out value="${conf.id}"/>">
    ...
    </div>
</c:forEach>

我只使用< c：set> 重复，引用它自己的值，追加/连接字符串。

I just use <c:set> repeatedly, referencing it's own value, to append/concatenate the strings.

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