Re: Re-populating form after validate fails

[Paul Barry]

If validate fails, your action won't even be processed.  You can't use any of the forwards that you may set up for your 
action, because your action never executes, you can't do a mapping.findForward("failure").  Once validate fails, it 
forwards to the input.  The struts example has validate=false (it uses the default) for the LogonAction.  It uses the 
validator to validate the form, so that is a different example.

I found the answer to my extra credit question, you can use input="forwardName" in your action if you have inputForward 
set to true in your controller config.  I have this set up, but it doesn't change any thing.  Here is the log of what 
happens when I fill in a username and no password:

Processing a 'POST' for path '/myaccount/loginAction'
Storing ActionForm bean instance in scope 'request' under attribute key 'LoginForm'
Populating bean properties from this request
Validating input form properties
Validation failed, returning to 'myaccount/login'
processForwardConfig(ForwardConfig[name=myaccount/login,path=/myaccount/login.do,redirect=false,contextRelative=false])
Processing a 'POST' for path '/myaccount/login'
Storing ActionForm bean instance in scope 'request' under attribute key 'LoginForm'
Populating bean properties from this request
Looking for Action instance for class myapp.struts.actions.ForwardAction
Returning existing Action instance
From toString in my ForwardAction -> 
Path=[/WEB-INF/jsp/myaccount/login.jsp],Form=[Username=sdfdsf,Password=]
processForwardConfig(ForwardConfig[name=null,path=/WEB-INF/jsp/myaccount/login.jsp,redirect=false,contextRelative=true])
I have removed all the info from these messages to make it easier to read.  All of these messages are DEBUG messages 
that come from the RequestProcessor, except the toString that I am printing out near the end.  This all looks like 
exactly what I would want to happen.  The original POST goes to loginAction, the validate method is called and fails, so 
it forwards to myaccount/login.  The form is stored in the request scope.  When I call the toString method after the 
form has been populated, you can see the username property is populated.  This makes sense.  The request was forwarded 
from the original action to this action.  The request parameters are still the same as the original request, so when the 
form is populated, the username field is populated.

What doesn't make sense to me is that when I look at my form on the HTML page (which is /WEB-INF/jsp/myaccount/login.jsp 
in this case), the username property is not populated.  This doesn't make sense to me.  The html:form tag should see 
that the form property for username is populated, so therefore the 'html:test property="username"' field should be 
populated with that value.  What am I missing here?


Subject:
Re: Re-populating form after validate fails
From:
[EMAIL PROTECTED]
Date:
Wed, 4 Feb 2004 12:50:17 +1100
To:
"Struts Users Mailing List" <[EMAIL PROTECTED]>
oops, you could be right. I left that out when I was genericising my 
action tag... just trying to make it more generic.

However, my point is still that when validate fails then the errors will 
not be empty... that is where your action tells struts to forward as:


 forward = mapping.findForward("failure");


and in your struts entry you can see (in my example) that "failure" is 
defined as the same form (but it could be anything)

an example of this is in the sample struts project in the struts tutorial 
where the login screen forwards to "welcome" if login was okay, or back to 
"login" if it failed.

so I'm not sure if the input parameter is responsible for the forward... 
it could be the default? 

Cheers,
Heya Gosper
CSC Australia
212 Northbourne Ave, Braddon ACT 2612
Ph: +61 (0) 2 6246 8155  Fax: +61 (0) 2 62468100
MOB: 0401 611779


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