Imagine you have a single ActionForm with a firstName field. Now
imagine you have two wizard pages that are used in sequence, and you
want to use the same ActionForm for both.
Assume the form is stored in session, as you would expect in a wizard.
Now, imagine there is a firstName field on both HTML forms of both
wizard pages... you might argue this isn't a good wizard design, and I
would tend to agree, but it's something that can happen in some cases.
Now, assume a prototypical Struts app, no Struts Dialogs extensions or
anything...
What happens when the first page submits? The firstName field is
populated in the ActionForm. Now what about when the second form is
submitted? The value of the firstName field in the ActionForm now has
the value from the second form submission, effectively overwriting the
value the user entered on the first page, so if the user were to go back
to the first wizard page, they would incorrectly see the data from the
second page in effect. Easily to explain, but to the user it's a data
corruption issue.
This is the scenario I was referring to. Does your Dialogs stuff
overcome that? If so, how? Whether it does or not, a "normal" Struts
app will certainly have this problem, hence my comment about making sure
the field names are different... in this case, it might be as simple as
making two fields in the ActionForm, one named firstNamePage1 and
firstNamePage2.
Frank
Michael Jouravlev wrote:
On 11/16/05, Frank W. Zammetti <[EMAIL PROTECTED]> wrote:
The one thing to keep in mind if you go [one ActionForm] route is
to be sure you don't have a field on one page
with the same name as another. I had one junior developer make that
mistake and it drove him nuts trying to figure out what was wrong
(obvious in retrospect, but one of those "tricky at the time" problems
to solve).
I don't see right away how does this matter if you have separate
submits from a browser each time. Also would not matter if you
redirect between pages and don't intentionally stuff values into
redirected request. Redirected request comes clean, so same fields or
not - does not matter. This is why my two-phase request processing
works: POST comes with input data, form is populated, then I redirect
to the same action again, GET comes clean, form is not updated because
request contains no data.
Forwarded request brings all input data with it, and Struts applies
this data to another form. Been there ;)
Michael.
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Omnytex Technologies
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