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Date: Fri, 13 Jul 2007 08:52:08 -0600
From: "Andrew Robinson" <andrew.rw.robinson@gmail.com>
To: "MyFaces Discussion" <users@myfaces.apache.org>
Subject: Re: Detecting whether or not the user changed anything on a form
In-Reply-To: 
 <E510A8B7AFE800438FA26ABFA5BEB14C05549DE7@C3EXCHANGE.corp.premierinc.com>
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References: 
 <E510A8B7AFE800438FA26ABFA5BEB14C05549DE7@C3EXCHANGE.corp.premierinc.com>

If at least one ValueChangeEvent is queued (by a UIInput component)
during the validation pahse, then something has changed.

On 7/13/07, Hannum, Daniel <Daniel_Hannum@premierinc.com> wrote:
>
>
>
>
> Hi,
>
>
>
> I have a form for editing a business entity. The form is prepopulated wit=
h
> the current values and the user can change everything and hit the submit
> button when their done. Fairly simple. What's tricky is that I'd like to
> only show a confirmation ("Changes saved") message if they actually chang=
ed
> something instead of just submitting the same values as before.
>
>
>
> The na=EFve way is to check each backing bean field against the field in =
the
> business entity, but that's unmaintainable when the object starts changin=
g.
> Is there a framework-based way to detect this? I want to avoid having to
> enumerate every field when I check. I want to know that _at least one_ of
> the fields on the page has a submitted value different from the model val=
ue.
> (I think I got the terminology right)
>
>
>
> Maybe the answer lies in a phase listener that would somehow do that chec=
k,
> my experience with that is limited. Please let me know if this is possibl=
e
> or not.
>
>
>
> And I'm using MyFaces and Trinidad so hopefully it would only use mechani=
sms
> include in those projects.
>
>
>
> Thanks
>
> Dan
>
>
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