Raajkumar wrote:
> I was trying to find the solution for the problem I had, but could not find
> it ... So I am posting it...
>
> I have List of beans say
>
> product
> - String name
> - int id
> - List years (which is a list of beans year)
>
> year
> - String name
> - long amount
>
> The problem is, the list years is different for different product...
>
This seems to be the problem of the month. What you are wanting is to
pivot your data from three dimensions into two dimensions and really I
don't think displaytag can do this for you.
What you can do is create a List and store in it a Map of values:
So this:
Product:
name = boat
id = 5
List year
2007, 5
2009, 8
2010, 2
2154, 1
becomes
Map:
name = boat
id = 5
2007 = 5
2009 = 8
2010 = 2
2154 = 1
Now displaytag can handle your data. Also while you're transforming your
data you can keep a track of the years that any of your products contain
which you can use to generate <display:column> tags:
<display:table name="mylistofmaps">
<display:column property="name"/>
<display:column property="id"/>
<c:forEach items="${years}" var="year">
<display:column property="${year}"/>
</c:forEach>
</display:table>
As I've said before it's called DISPLAYtag. It is excellent at
displaying data and tries its best at other things but it is not some
panacea that can magically transform your arbitrary data into a table
without you doing some work.
Hope I've helped.
Ed!
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