If you find an error during the validate() and fordward to the action, the
validate() method will be called again before the execution of the
perform(), because the action will try to validate the form is receiving,
and you'll be in a loop.
I 'm experiencing that problem.
I appreciate if you could help me.
Re: Validation of errors and re-population of request
* From: Bill Clinton
* Subject: Re: Validation of errors and re-population of request
* Date: Fri, 03 Aug 2001 21:37:20 -0700
Tim,
I'm not sure this will work for you, but if it does, it may be the
easiest solution. I am assuming that you have a failure forward in
the Delete action that sends the user back to the list page. Instead of
mapping this forward to the list page, map it to the list action. That
way, the action errors (or non-struts error message) that you save in
the request object will still be there, and it will pick up the vector
in the list action before it dispatches to the list page.
Bill
Tim Trentham wrote:
I'm wondering if there is a best practice or standard Struts way of
handling repopulation of request attributes needed for a page after an
error.
For instance, I have a list of contacts with a checkbox next to each
one.
The list is generated by the logic:iterate and multibox tags using a
vector
that is placed in the request by the action that forwards to the page
that
displays the list. The user can select contacts from the list and delete
them.
If the user clicks the delete button and there are no users checked, my
validate method throws them back to the page telling them that they need
to
pick something. Of course, the vector is no longer in the request for
display, so you see the error message, but no users.
I did find a two things in past posts, but nothing really promising...
1)
repopulation occurs in the reset method
http://www.mail-archive.com/struts-user@jakarta.apache.org/msg05423.html
but this means that you are re-populating the request with the dropdown
list
even if there aren't any errors, which seems like a waste of resources.
also, you still have to populate the first time from somewhere else as
the
forms reset() method isn't called until after the first time the page is
displayed.
2)
repopulation occurs in validate method
http://www.mail-archive.com/struts-user@jakarta.apache.org/msg11305.html
this is what i'm looking at doing, but once again, i have to do it in
two
places: the original action that generates the list in the jsp page and
then
in the validate method of the form if there is an error.
I also have the additional problem of keeping track of which vector to
re-generate. I display the contacts in blocks of 25, so if you are on
the
second block of 25 and you click delete with no contacts checked, I need
to
know that I need to re-generate the second block and not the first.
I'm wondering if others have come up with a good way of handling this
before
I go off and reinvent the wheel.
Thanks.
Tim
Tim Trentham
Platform Development
@hand Corporation
[EMAIL PROTECTED]
Oscar Guindzberg
EDS - Interbanking
Arias 1851
Capital Federal (1429)
* 4704-3527
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