如何将此Struts2转换为displaytag（日期比较）

Question

I had Struts2 code to show a button based on the result of a date comparison like this (note that this is a simplified example of what I actually have):

<s:iterator value="myList">
    <s:if test="%{getDate().compareTo(getNow()) > 0}">
        // Show the item
    </s:if>
</s:iterator>

I have since converted the display of the result set to use displaytag. How would I do the above using display tag. This is what I've tried.

<display:table name="myList" pagesize="50" id="row">
    <display:column title="Item">
        <s:if test="%{#attr.row.endDt.compareTo(#attr.row.now()) > 0}"><%--does NOT work--%>
    </display:column>
</display:table>

What is the correct syntax of the <s:if> statement?
Or can this not be done using displaytag + Struts2?

Answer 1

Using the #attr.row as index to reference the element in the list should work:

<display:table name="myList" pagesize="50" id="row">
    <display:column title="Item">
        <s:if test="myList[%{#attr.row_rowNum - 1}].endDt.compareTo(myList[%{#attr.row_rowNum - 1}].now()) > 0}">
           <span>Let's rock</span>
        </s:if>
    </display:column>
</display:table>

Note: is getNow() a function coming from the iterated object ?

This seems strange to me, shouldn't it be a common function, from the baseAction from example ?

Answer 2

Another way would be use a displaytag decorator.

 public String getLink()
 {
    YourObject yourObject = (YourObject) getCurrentRowObject();
    //Do your checks....
    return "<a href="#">your link</a>";

 }

Answer 3

There are likely multiple solutions but, this ended up working for me:

<display:table name="myList" pagesize="50" id="row">
    <display:column title="Item">
        <s:set name="endDt" value="#attr.row.endDt"/>
        <s:set name="now" value="now" />
        <s:if test="%{#endDt.compareTo(#now) > 0}">
           <span>w00 h00!</span>
        </s:if>
    </display:column>
</display:table>