My experience has been that you can't really do what you want based on a value
that varies row-by-row. The <column> tag is more "global" than that, because it
defines the columns the table will have for ALL rows.
In several of my JSPs, I have conditional logic inside the BODY of the <column>
tag to determine what, if anything, to display for a specific row. For example
(assuming you use EL):
<display:table id="row_rec" ...>
...
<display:column title="COL1" sortable="true"> <===== NOTE: No 'property'
attribute
<core:choose>
<core:when test="${row_rec.show_col1}">
<core:out value="${row_rec.col1}" />
</core:when>
<core:otherwise>
</core:otherwise>
</core:choose>
</display:column>
...
</display:table>
On the other hand...if you want to conditionally display the column based on
the value of a scoped attribute (i.e., NOT part of the row data), you CAN put
the <column> tag inside JSP logic tags. For example:
<display:table id="row_rec" ...>
...
<core:if test="${displayColumn1}">
<display:column property="col1" title="COL1" sortable="true" />
</core:if>
...
</display:table>
I hope this helps.
--John D.
John J. DiLeo, D.Sc.
USDA TAAF Development Lead
Echota Technologies Corp.
Office: (816) 823-5395
Mobile: (816) 803-2678
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-----Original Message-----
From: Emi Lu [mailto:em...@encs.concordia.ca]
Sent: Friday, January 21, 2011 2:32 PM
To: displaytag-user@lists.sourceforge.net
Subject: [displaytag-user] If logic to dynamic decide whether to display a
column
Good afternoon,
Need help about using "if logic" to determine whether to display a
column under display:table
For example:
<display:table id="row_rec"
name="alist_paging_bean"
export="true"
class="simple"
cellspacing="0"
cellpadding="5"
requestURI="ProcessAction"
keepStatus="true"
pagesize="<%=bean_display.getPageSize() %>"
partialList="true"
size="<%=bean_display.getTotalRecNum() %>"
defaultorder="ascending"
defaultsort="1"
>
Need sth like:
======================
if %{#attr.row_rec.show_col1}
<display:column property="col1" title="COL1" sortable="true" />
Otherwise, do not display "col1".
What is the grammer of "if %{#attr.row_rec.show_col1}" in jsp please?
In the Bean.java,
private boolean show_rec1;
Thanks a lot!
--
Lu Ying
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