Joris Wijlens wrote:
Hi,
I have this multi row update form implemented with a datable. The
updates are in the collection that was bound to the datatable. So far so
good. But now I want to which rows got changed because I don't want to
submit all the rows of the collection to the database.
How can i do this?
I do this by attaching a ValueChangeListener to every updatable
component in the table. The listener just stores away a reference to the
current rowData object in a list of "changed" objects. When the "update"
action executes, it then iterates over the list of "changed" objects.
The valueChangeListener tag only takes a classname, unfortunately, so
there are a few hoops to jump through in order to be able to access the
rowData object and access the list into which it should be stored. I
can't remember the exact details for now, but it's not too hard; I think
from memory I used a VariableResolver to evaluate an EL expression to
get access to the necessary object.
Regards,
Simon
