On Wednesday 05 July 2006 01:28 pm, Rick Herrick wrote:
<snip>
> As far as displaytag goes, though, it has no inherent ability to do this.
> Its job is to display the list, not manage the list through a user
> session.
I understand this philosophy but it seems really limit the usefulness
of the library. The philosophy works if you can say that I'm going to
display data that is an island unto itself. But once you place it into
a working site where users expect interaction between pages, not
knowing the last state of things as seen by displaytag case be
problematic. In this case (and I've run into a similar situation) having
to mimic the UI's paging & sorting mitigates the benefits that drew
me to using the tag library in the first place. In other words, if I have
to sort and page the data so I know the list that the user last saw, for
processing on another page (in this case an update page...which
must be somewhat common item since it's the same issue I've run
into), then I've lost some of the benefit of using displaytag.
As I was rewriting and editing that last paragraph it hit me that maybe
the best way to deal with this situation is to write a table decorator that
"records" into the session the list of items currently displayed.
table decorator:
constructor():
clear/create session array/list variable with the required
number
of entries per row. Looks like that can be obtained via
tableModel -> getProperties() -> getPagingGroupSize()
startRow():
use getViewIndex() to know the row and getCurrentRowObject()
to get the data for that row. save in the list saved in the
session.
a list of hashCode's should be workable I should think. The same technique
may also be useful in tracking sorting/paging.
Thoughts any/everyone?
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