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From: bob fuller <bobfuller30004@hotmail.com>
To: <user@struts.apache.org>
Subject: Struts 2 - Repopulate controls when validation fails
Date: Thu, 26 Jun 2008 02:14:28 +0000
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I'm following the "How do we repopulate controls when validation fails" FAQ=
 located at...

http://struts.apache.org/2.x/docs/how-do-we-repopulate-controls-when-valida=
tion-fails.html

Of the two methods it suggests I am trying to use the 'action tag' method. =
Using the simple example from the FAQ works fine, but once I move beyond th=
e simple and try to drop my "Languages" control inside the  tag of another =
action I have problems.

Here's my pseudo JSP (note MyAction)...


MyAction implements validateable and I am validating foo0 and foo1 inside t=
he validate() method. Here's my validate() code...

public void validate() {
if (foo0 =3D=3D null || foo0.length() =3D=3D 0)
  addFieldError("foo0", "Foo0 is required");
else
  foo0 =3D foo0 + " VALIDATED";

if (foo1 =3D=3D null || foo1.length() =3D=3D 0)
  addFieldError("foo1", "Foo1 is required");
else
  foo1 =3D foo1 + " VALIDATED";	=09
}

The important thing to note about my validation code is that when the valid=
ation succeeds the data entered by the user is updated with the word "VALID=
ATED". This may seem like an odd thing to do, but it's part of the requirem=
ents of the project I'm working on.

Visiting http://localhost/MyAction/myAction_input.action works great. The p=
age draws, foo0 is empty, the languages control has languages to choose fro=
m, foo1 is empty, the submit button appears. Submitting the form is when I =
get into problems. Here are three submit paths and their results...

1. foo0 is empty, foo1 is empty. click submit. RESULT - foo0 is empty. foo1=
 is empty. SUCCESS!
2. foo0 =3D 'A', foo1 is empty. click submit. RESULT - page redraws. foo0 =
=3D 'A VALIDATED'. foo1 is empty. SUCCESS!
3. foo0 is empty, foo1 =3D 'A'. click submit. RESULT - page redraws. foo0 i=
s empty. foo1 =3D 'A'. FAIL! - foo1 should say 'A VALIDATED'

For some reason MyAction.setFoo1() is being invoked *again* after I set foo=
1 to 'A VALIDATED' in my validate() code. Why is that happening? I know it =
has something to do with the Languages control that appears before the foo1=
 text field, because when I remove the Languages control everything works a=
s expected.

Anyone have any ideas about what the Languages control is doing that is cau=
sing my foo1 field to get reset to the original submit value? I'd really li=
ke to be able to use the 'action tags' approach for repopulating controls, =
but 'dropping wherever', as suggested in the FAQ (see link above), does not=
 seem to be as easy as it sounds.

Thanks.


=20

_________________________________________________________________
The other season of giving begins 6/24/08. Check out the i=92m Talkathon.
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