1 : no
2 : no
Struts allows to forward from an action to another action!!!
(should be documented in the mailing-list-archive and the dtd,...)
This way each page is a single problem (action to init, display,
action to evaluate). Struts-config.xml will tie them together.
Whether you use 1 or 2 actions for a page (earlier posts in the thread)
does not matter. I prefer 1 action and control the "flow" using the
parameter-attribute in the action-definition in struts-config.xml
In the action I just have a
if ("init".equals(mapping.getParameter()))...
else if ("eval".equals(mapping.getParameter()))...
hope this helps
Alexander Jesse
-----Original Message-----
From: Ian Beaumont [mailto:[EMAIL PROTECTED]]
Sent: Mittwoch, 20. Februar 2002 17:52
To: 'Struts Users Mailing List'
Subject: RE: ActionForm and default values
This means that in the action for the "select item" I need to get hold of
the form bean for the next page I'm going to so I can populate it.
Two problems with this:
1. How do I get hold of the form bean? Do I create it myself?
2. This all relies on me knowing the mappings of what page I'm going to go
to next so I can populate the form bean. This defeats the object of having
the struts-XML file.
Below is the text from a previous email I sent. The only reply I got was
the example didn't show 'best practises'. In which case, what is the best
practise.
I've been through the struts-example again. What I want to achieve is
something similar to the 'Edit user registration details'. This
pre-populates the form with existing details. Now the way the example does
this is to create the RegistrationForm in the action and then populate it.
>From "EditRegistrationAction.java"
// Populate the user registration form
if (form == null) {
if (servlet.getDebug() >= 1)
servlet.log(" Creating new RegistrationForm bean under key "
+ mapping.getAttribute());
form = new RegistrationForm();
if ("request".equals(mapping.getScope()))
request.setAttribute(mapping.getAttribute(), form);
else
session.setAttribute(mapping.getAttribute(), form);
}
This seems really nasty as you are now hard-coding the name of the form
class that will be used for validation on the next page. Any changes in
future to the "struts-config" file may well break the system. It doesn't
feel right to have to create these forms ourselves.
Wouldn't it be more sensible to have a pre-creation method on the action of
a form that allowed allowed a the action to populate the form fields before
the page was displayed.
-----Original Message-----
From: Jim Crossley [mailto:[EMAIL PROTECTED]]
Sent: 20 February 2002 16:38
To: Struts Users Mailing List
Subject: Re: ActionForm and default values
Ian Beaumont <[EMAIL PROTECTED]> writes:
> Ok - I want to select an item on one page which will take me to
> another page where I can edit the selected item.
Sounds common enough.
> How do I pre-populate the form for the edit page in the action for
> the selected item as the form won't exist at this point?
As long as you have the "name" attribute set correctly for the
appropriate <action> element of struts-config, the formbean will
always exist! The controller servlet creates it for you.
-- Jim
> -----Original Message-----
> From: Jim Crossley [mailto:[EMAIL PROTECTED]]
> Sent: 20 February 2002 16:06
> To: Struts Users Mailing List
> Subject: Re: ActionForm and default values
>
>
> It's pretty simple, I think.
>
> 1) The formbean is passed to the action's perform method by the Struts
> controller.
>
> 2) The action populates the formbean (ReportDataForm) from the value
> object (ReportData).
>
> 3) The action returns the appropriate ActionForm to render the view.
>
> 4) The view (ReportData.jsp) need look no more complicated than this:
>
> <html:form action="/reportAction">
> <html:text property="reportName"/>
> </html:form>
>
> -- Jim
>
> Ian Beaumont <[EMAIL PROTECTED]> writes:
>
> > This question seems to be going around and around this mailing list
> and
> > no
> > one has produced an answer.
> >
> > -----Original Message-----
> > From: Dua, Amit [mailto:[EMAIL PROTECTED]]
> > Sent: 20 February 2002 15:46
> > To: 'Struts Users Mailing List'
> > Cc: '[EMAIL PROTECTED]'
> > Subject: RE: ActionForm and default values
> >
> >
> > But then how will I set the default values
> >
> > amit
> >
> > -----Original Message-----
> > From: Keith [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, February 20, 2002 10:36 AM
> > To: Struts Users Mailing List
> > Subject: Re: ActionForm and default values
> >
> >
> > try removing the value= attribute from your <html: text.
> > hope that helps.
> >
> > --- "Dua, Amit" <[EMAIL PROTECTED]> wrote:
> > > Hi
> > >
> > > I want to populate my page with default value
> > >
> > > So, in order to do that
> > > I have a value object (ReportData), ReportDataForm (Form Bean)
> > >
> > > I populate the Value object through one of the Action classes and
> then
> > do
> > a
> > > Action Forward to one of the Jsp namely ReportData.jsp
> > >
> > > In the ReportData.jsp I do following
> > >
> > > ReportData reoportData =
> > (ReportData)request.getAttribute("reportdata");
> > > <html:form action="reportAction.do">
> > > <html:text property="reportName"
> > value="<%=reportData.getReportName()%>"/>
> > > ..................
> > > ..............
> > >
> > >
> > > I do all the validation In ReportAction class which is mapped to
> > > reportAction.do
> > >
> > > But when there is an error In the field , I am not able to get the
> > value
> > > populated for the text field.
> > >
> > >
> > > Is there something wrong I am doing.
> > > Or is there any other better way of doing this thing..
> > >
> > >
> > > Amit
> > >
> > >
> > > --
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> >
> >
> > =====
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Search the archive:-
> > http://www.mail-archive.com/struts-user%40jakarta.apache.org/
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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> >
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