While I am on the topic...
On Jan 3, 2006, at 3:52 AM, Miguel Arroz wrote:
I'm building an WO application to manage the participant of a
conference. One of the features is a public form where people may
register themselves on the conference, and the registration will
later be approved by someone from the organization team.
To do that, I have a main page, that links to a "subscription"
page with a form. When the user submits a form with no errors, a
confirmation page is shown, basically with a message that tells the
user he will receive an email shortly with the confirmation.
On the form page, I create a new user and context, and bind the
user fields with the form fields.
I would do this immediately after the save and before showing the
confirm page. That way, if the user backtracks, they will get a
fresh, blank form.
The problem is... if the user is in the confirmation page, and
goes "back" in the browser, he will see the form again. If he
changes data and submits again, he will effectively change his data.
This is a common problem in web apps, compounded in WO by the fact
that it normally maintains state. Pierre Bernard has an article and
code on this on his website. There are a few different ways of
handling this.
I may think of a number of solutions for this (not binding
directly to the user, but to temporary variables; having some king
of "alreadySubmited" flag; etc). What I would like is to have your
opinion to know what is the more "WOish" solution, the best
practise. I'm sure you all had this problem before, and I'm sure
you all solved it! :)
In this case, I would probably go with the alreadySubmitted flag and
if it is set, then don't save and just return the confirmation page.
Chuck
--
Coming in 2006 - an introduction to web applications using WebObjects
and Xcode http://www.global-village.net/wointro
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems. http://www.global-village.net/products/practical_webobjects
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