JSP根据条件在for循环中插入页脚 [英] JSP Insert footer based on condition in for loop

问题描述

我想循环打印记录表，基于以下条件：

如果记录数大于35，我将需要暂停循环，为下一页插入一个页脚和一个新的标题，并继续它的计数直到最后一个记录。

这里的条件是只使用jsp classic scriplet。

这是我所拥有的，并且我被困住了:(以伪代码格式）

 <％int j = 0; 
 for（int i = 0; i< list.size（）; i ++）{
 col1 = list.get（i）.getItem1（）; 
 col2 = list.get（i）.getItem2（）; 
 col3 = list.get（i）.getItem3（）; 
 j ++; 
 
 if（j == 35）{％> //停止渲染页脚和下一页的页眉
< / table> 
< table> 
 <！ - 页脚内容 - > 
< / table> 
< table> 
 <！ - 下一页的页眉 - > 
< / table> 
<％}％> <％>< t>< td><％= col1％>< / td>< td><％= col1％>< / td> COL1％GT;< / TD>< / TR> 
 
<％}％> 
  

这个模型的问题在于，如果我在这里使用break，我会停止循环，我不能从记录＃36循环到记录结束。
我该如何去做这件事？

解决方案

如果你不想使用正确的分页，那么使用JSTL如下。

  //计数器变量初始化
 < c：set var =countervalue =0scope =page/> 
< c：forEach items =$ {itemList}var =item> 
 
 //计数器增量
 < tr> 
< td> $ {item.propertyOne}< / td> 
< td> $ {item.propertyOne}< / td> 
< / tr> 
< c：if test =$ {counter％35 == 0}> 
 //在这里包含你的页脚。 
< / c：if> 
< / c：forEach> 
  

I want to loop a table of records for printing, based on the following condition:

If the number of records is more than 35, I will need to pause the loop, insert a footer, and a new header for the next page and continue its count till the last record.

The condition here is to use only jsp classic scriplet.

Here is what I have and I am stuck: (in pseudo code format)

<% int j=0;
   for(int i=0; i < list.size(); i++){
    col1 = list.get(i).getItem1();
    col2 = list.get(i).getItem2();
    col3 = list.get(i).getItem3();
    j++;

    if (j==35) {%> // stops to render footer and next page's header 
    </table>
    <table>
       <!-- footer contents -->
    </table>
    <table>
       <!-- header for next page -->
    </table>
    <%}%>
<tr><td><%=col1%></td><td><%=col1%></td><td><%=col1%></td></tr>

<%}%>

the problem with this model is that if I use a break inside this if, I'd stop the loop and I can't loop from record #36 to end of record. How do I go about doing this?

解决方案

If you don't want to use proper pagination then use JSTL as below. Easier to read than scrip-lets as well, apart from the obvious benefits.

//The counter variable initialization
<c:set var="counter" value="0" scope="page"/>
<c:forEach items="${itemList}" var="item">

  //Counter increment
  <c:set var="counter" value="${counter + 1}" scope="page"/>
  <tr>
    <td>${item.propertyOne}</td>
    <td>${item.propertyOne}</td>
  </tr>
  <c:if test="${counter % 35 == 0}">
    //Include your footer here.
  </c:if>
</c:forEach>

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