Senthilrajan VS wrote the following on 7/13/2005 10:53 AM:
Hi All,
I'm using html:iterate to display the set of records in the table. Is
there any way to put the alternate color using CSS classes in tag libraries
Since you will probably need this functionality in several places in
your application, I suggest you make tag to do it, vs doing the
conditional logic everywhere within the application. Using JSP2.0 I made
this simple tag file that I'll list below.
In order to use it you simply replace your standard tr with something like:
<c:forEach items="${associates}" var="associate" varStatus="status">
<tags:AltRowColor status="${status.index}"/>
<td>.....</td>
You mentioned you were using logic:iterate, which in that case replace
${status.index} with whatever your current count var is (forgot the
logic:iterate syntax).
The tag file takes some optional parameters. If you provide nothing like
I did above (other than status) it will create class="odd" and
class="even" so you'll need to have an odd and even classes definined in
a style sheet somewhere. However, if you don't like those terms 'odd'
and 'even', you can pass in your own class names (ie odd="myOddClass").
It also lets you pass in an optional class name in case you already have
one defined that handles the rest of the row format. (The only thing you
might want to add to the tag is the option to take a 'style' definition
that would be the custom hardcoded style - I don't like that practice
though since typically I like to define classes that have my styles,
since it's easier to maintain).
Also, assuming you put this tag file below in a directory under WEB-INF
called "tags," don't forgot the import on the top of the pages you want
to use like this:
<%@ taglib prefix="tags" tagdir= "/WEB-INF/tags" %>
Here's the simple tag file:
//AltRowColor.tag
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"; %>
<%@ attribute name="status" %>
<%@ attribute name="odd" %>
<%@ attribute name="even" %>
<%@ attribute name="styleClass" %>
<%-- if user doesn't provide an odd or even value it uses odd and even
as class names --%>
<c:if test='${even == null || even == "" }'>
<c:set var="even" value="even"/>
</c:if>
<c:if test='${odd == null || odd == "" }'>
<c:set var="odd" value="odd"/>
</c:if>
<c:choose>
<c:when test="${(status +1) % 2 != 0 }">
<tr class="${odd} ${styleClass}">
</c:when>
<c:otherwise>
<tr class="${even} ${styleClass}">
</c:otherwise>
</c:choose>
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