Shane, exactly what I was looking for and unable to find. Thanks!
JR
-Original Message-
From: Shane Mingins [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 18, 2003 10:26 PM
To: 'Struts Users Mailing List'
Subject: RE: Refreshing Form Submission and Duplicates
I noticed this the other day at http://husted.com/struts/catalog.html
Use the Action Token methods to prevent duplicate submits
There are methods built into the Struts action to generate one-use
tokens.
A
token is placed in the session when a form is populated and also into
the
HTML form as a hidden property. When the form is returned, the token
is
validated. If validation fails, then the form has already been
submitted,
and the user can be apprised.
- saveToken(request)
- on the return trip,
isTokenValid(request)
resetToken(request)
I am not sure if that is of any help as I have yet to use it ...
although
I
have just this minute found a case in my own application to do so ;-
Shane
-Original Message-
From: John Reynolds [mailto:[EMAIL PROTECTED]
Sent: Friday, 19 September 2003 2:16 p.m.
To: [EMAIL PROTECTED]
Subject: Refreshing Form Submission and Duplicates
Hi,
I have a question about a bug in my application using a Struts Form.
This happens in multiple areas of my site, but the one example I
will
use is a Message Board feature. The problem is that when a user goes
to
a list of messages, fills out the form to post a message and ends up
back on the list page, the message will be submitted twice if they
refresh the page following the form submission. this has caused
duplicate messages throughout the message board, as it is the nature
of
message boards to refresh the list of messages often to check for
new
ones. Keep in mind, my app strictly follows the approach of the
O'Reilly
book.
I'll try to make this easy to follow:
1. the user goes to a message board with a list of messages from
other
users. this page is /messagelist.do the action looks like this:
action
path=/messagelist
name=messageListForm
type=myapp.framework.actions.MessageListAction
scope=request
forward name=Success
path=/templates/messagelist.jsp/
/action
(the messageListForm is a struts form bean with a List of message
objects)
2. at the bottom of the page is a form to post your own message 3.
the
user enters their Name, Subject and Message Body and submit the form
4.
the form is processed by a Struts Action. the action tag in
struts-config.xml looks like this:
action
path=/messageinsert
name=messageDetailForm
type=myapp.framework.actions.MessageInsertAction
scope=request
validate=false
forward name=Success path=/messagelist.do/
/action
- From the naming convention, you can see that the Action inserts
the
message into storage (database) and upon success the user is
forwarded
to the same /messagelist.do action
Now, when the form is submitted and this is displayed, the URL in
the
browser says:
http://myapp.com/myapp/messageinsert.do
I expect that this is correct because the HTML form itself was form
action=/messageinsert.do method=POST.
The user's submitted message will be found on the list of messages.
HOWEVER, IF THEY REFRESH THE SCREEN, THE MESSAGE WILL BE SUBMITTED
AGAIN. This should not happen. If i'm the customer, i've already
submitted the form, and now i'm seeing a list of messages.
refreshing
should have no effect on the form that i just submitted.
Does anyone have a suggested fix?
Thanks all,
JR
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