jsf - EL 表达式中的 OR 条件如何？

Question

我想在这个菜单中做一个 OR 条件:

<li class="#{facesContext.viewRoot.viewId == ('/company/team.xhtml' or '/company/partnerships.xhtml' ) ? 'active' : '' }"><a class="item" href="company/company.xhtml">Company</a>
    <ul>
        <li><a href="company/team.xhtml">Team</a></li>
        <li><a href="company/partnerships.xhtml">Partnerships</a></li>
    </ul>
</li>

如果 team.xthml或 partnerships.xhtml页面由用户选择，“事件”值将在 <li> 中设置标签。

Answer 1

这是正确的语法:

<li class="#{facesContext.viewRoot.viewId == '/company/team.xhtml' or facesContext.viewRoot.viewId == '/company/partnerships.xhtml' ? 'active' : '' }">

为了让它更短一点，你可以使用 #{view}而不是 #{facesContext.viewRoot} :

<li class="#{view.viewId == '/company/team.xhtml' or view.viewId == '/company/partnerships.xhtml' ? 'active' : '' }">

为了让它更短，你可以给 #{view.viewId} 取别名。与 <c:set> :

<c:set var="viewId" value="#{view.viewId}" scope="request" />
...
<li class="#{viewId == '/company/team.xhtml' or viewId == '/company/partnerships.xhtml' ? 'active' : '' }">