java - <C :if/Choose/When> condition to be made as one 的多个实例-6ren

java - condition to be made as one 的多个实例

转载作者：太空宇宙更新时间：2023-11-04 08:43:35

1:我有一个包含多个 html“TR”的 JSP

  <tr>'s

我的页面

  <% ...%>
  <html>
  ...
  <body>
  <table>
  <tr class="1"> This is first line</tr>
  <br/>
  <tr class="2"> This is Second line</tr>
  <br/>
  <tr class="3"> This is Third line</tr>
  <br/>
  <tr class="4"> This is Fourth line</tr>
  <br/>
  <tr class="5"> This is Fifth line</tr>
  <br/>
  ...
  </html>

2:现在我正在获取用户 session (如果已登录)。注意>>:使用Liferay主题显示在此处

  <%String userEmail=themeDisplay.getUser().getEmailAddress();%>
  <c:set var="userEmail" value="<%=userEmail%>"></c:set>

3:我检查了其是否是访客或注册/登录用户。

然后，第一个和最后一个“TR”的显示将更改为登录用户。

  <% ...%>
  <html>
  ...
  <body>
  <table>
  <c:if test="${not empty userEmail}">      
  <tr class="1"> This is first line for registered user</tr>
  <c:if test="${empty userEmail}">      
  <tr class="1"> This is first line</tr>
  <br/>
  <tr class="2"> This is Second line</tr>
  <br/>
  <tr class="3"> This is Third line</tr>
  <br/>
  <tr class="4"> This is Fourth line</tr>
  <br/>
  <c:if test="${not empty userEmail}">      
  <tr class="5"> This is Fifth line for registered user</tr>
  <c:if test="${empty userEmail}">      
  <tr class="5"> This is Fifth line</tr>
  <br/>
  ...
  </html>

这工作正常!!

我的问题>>>>>如果我想将此检查作为某种常量，这不会在 JSP/HTML 页面上重复多次。该怎么办？？？

  <c:if> //to be declared only once. And called which ever <TR> needs a check??

最佳答案

一些替代方案:

使用 c:set 在页面上设置注册变量，用于 c:choose。


    <c:set var="registered" value="${not empty userEmail}"/>
    <c:choose>
    <c:when test="${registered}">
    <tr class="1"> This is first line for registered user</tr>
    </c:when>
    <c:otherwise>
    <tr class="1"> This is first line</tr>
    </c:otherwise>
    </c:choose>

Write the first and last lines as blank table rows, then use a c:choose to run javascript to insert the data you want.


    <table>
    <tr id="firstRow"></tr>
    ...
    <tr id="lastRow"></tr>
    </table>

    <c:choose>
    <c:when test="${not empty userEmail}">
    <script>
    document.getElementById('firstRow').innerHTML = 'This is first line for registered user';
    document.getElementById('lastRow').innerHTML = 'This is Fifth line for registered user';
    </script>
    </c:when>
    <c:otherwise>
    <script>
    document.getElementById('firstRow').innerHTML = 'This is first line';
    document.getElementById('lastRow').innerHTML = 'This is Fifth line';
    </script>
    </c:otherwise>
    </c:choose>

关于java - <C :if/Choose/When> condition to be made as one 的多个实例，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4794195/

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java - condition to be made as one 的多个实例