For stateless pages it would create a new one each time (add the DebugBar to
your pages and see if your page is stateless or not and also see what the
model is per component).
For when Wicket serializes your page, you don't want a PropertyModel alone,
you want a detachable model (see section 9.6 of the Wicket Free Guide or go
over chapter 9 again "Wicket models and forms"). You need to wrap a
Detachable model inside a Property model like so:
add(new TextField("url", new PropertyModel<MorphiaCnavUrl>(new
LoadableDetachableModel<MorphiaCnavUrl>(cnavUrl), "URL"))
.setRequired(true)
.add(new UrlValidator()));
Is best to use a CompoundPropertyModel for the entire form and get to your
POJO that feeds the entire form (or panel) via a detachable model.
The LoadableDetachableModel is desined to only serialize the record ID for
which you can later retrieve the entire object from your persistence layer.
~ Thank you,
Paul Bors
-----Original Message-----
From: Daniel Watrous [mailto:dwmaill...@gmail.com]
Sent: Friday, July 19, 2013 11:24 AM
To: users@wicket.apache.org
Subject: Re: Form questions
Paul,
Thanks. I get that and understand how the Model happens. As you can see, the
instance of the model object is created in the constructor. So the first
question I had is whether a new instance is created for every request or if
there's one instance that's serialized. I suspect it's the second, knowing
how Wicket treats sessions. In that case, I need some way on a per request
basis to load the model from the database.
The other question I had is how to create a link that sends the ID to the
page that renders the form. I need to create a link to that page, include an
ID value with the request and then access that ID within the form for my
query to load that object from the DB.
Daniel
On Thu, Jul 18, 2013 at 5:14 PM, Paul Bors <p...@bors.ws> wrote:
> Okay let's pre-populate this field:
>
> add(new TextField("url", new PropertyModel(cnavUrl, "URL"))
> .setRequired(true)
> .add(new UrlValidator()));
>
> Its mode is a new PropertyModel(cnavUrl, "URL"), which is the "CnavUrl
> cnavUrl = new MorphiaCnavUrl();".
> So it's the cnavUrl.getUrl() value.
>
> What do you get when you call new MorphiaCnavUrl().getUrl()?
> That's what should appear in the TextField when you first load the
> page (normally read form the DB).
>
> ~ Thank you,
> Paul Bors
>
> -----Original Message-----
> From: Daniel Watrous [mailto:dwmaill...@gmail.com]
> Sent: Thursday, July 18, 2013 6:03 PM
> To: users@wicket.apache.org
> Subject: Re: Form questions
>
> I've made a lot of progress and been through chapters 9 and 10 of
> Wicket Free Guide, but I'm still stumped on point #2, pre-populating the
form.
> Here's what I have right now:
>
> public class CnavForm extends Form {
>
> @Inject private CnavUrlDAO cnavUrlDAO;
>
> public CnavForm(String id) {
> super(id);
> CnavUrl cnavUrl = new MorphiaCnavUrl();
> setModel(new Model((Serializable) cnavUrl));
>
> add(new TextField("url", new PropertyModel(cnavUrl, "URL"))
> .setRequired(true)
> .add(new UrlValidator()));
> add(new HiddenField("objectid", new PropertyModel(cnavUrl,
> "id")));
>
> add(new Button("publish") {
> @Override
> public void onSubmit() {
> CnavUrl cnavUrl = (CnavUrl)
CnavForm.this.getModelObject();
> // check for existing record to know if this is a
> create or update
> if (((MorphiaCnavUrlModel)cnavUrl).getId() == null) {
> // create
> cnavUrlDAO.save(cnavUrl);
> } else {
> // update
> cnavUrlDAO.save(cnavUrl);
> }
> }
> });
> }
> }
>
> I need to know how to do two things.
> 1) how to link to the page that displays the form, and pass it the ID
> for the record I want to edit
> 2) load the object from the database and have it replace the model I
> create in the constructor
>
> Obviously I can make a database call and get the object. Is the
> constructor called every time the page is requested, so that I could
> check for an ID and either create the model or load it from the
> database? If so, then I just need help with #1.
>
> Thanks,
> Daniel
>
>
> On Wed, Jul 17, 2013 at 10:19 AM, Daniel Watrous
> <dwmaill...@gmail.com>wrote:
>
> > I think I'm getting it now. The Form needs to be embedded in a panel
> > for the type of inclusion that I'm interested in.
> >
> > I created a CnavFormPanel.java and changed CnavForm.html to
> > CnavFormPanel.html. I left CnavForm.java alone.
> >
> > In CnavModify.java I removed this
> >
> > Form form = new CnavForm("cnavFormArea");
> > add(form);
> >
> > And added this
> >
> > add(new CnavFormPanel("cnavFormArea"));
> >
> > That works. Thanks for your help.
> >
> > Daniel
> >
> >
> > On Wed, Jul 17, 2013 at 10:07 AM, Daniel Watrous
> <dwmaill...@gmail.com>wrote:
> >
> >> I can make it work if I put the markup from CnavForm.html directly
> >> into CnavModify, but the form is not as reusable then. I would have
> >> to duplicate the markup for other pages that use the same form...
> >>
> >> Dnaiel
> >>
> >>
> >> On Wed, Jul 17, 2013 at 9:55 AM, Daniel Watrous
> <dwmaill...@gmail.com>wrote:
> >>
> >>> That's what I tried to do. I created CnavForm.java and
> >>> CnavForm.html. In the latter file I have this
> >>> <wicket:panel>
> >>> <form wicket:id="cnavForm"...>
> >>> // form details
> >>> </form>
> >>> </wicket:panel>
> >>>
> >>> Then I have CnavModify.java and CnavModify.html. You already see
> >>> what I have in CnavModify.java from my last email. My
> >>> CnavModify.html
> has this.
> >>> <wicket:extend>
> >>> <span wicket:id="cnavFormArea">Here's the form</span>
> >>> </wicket:extend>
> >>>
> >>> Rather than render I'm getting this error:
> >>> Last cause: Component [cnavFormArea] (path = [0:cnavFormArea])
> >>> must be applied to a tag of type [form], not: '<span
> wicket:id="cnavFormArea"
> >>> id="cnavFormArea3">' (line 0, column 0)
> >>>
> >>> I'll keep trying and report back when I figure it out.
> >>>
> >>> Daniel
> >>>
> >>>
> >>> On Tue, Jul 16, 2013 at 10:50 PM, Paul Bors <p...@bors.ws> wrote:
> >>>
> >>>> Wicket is a MVC component driven framework similar to Swing.
> >>>> In short, what you want to do is create your own Panel with that
> >>>> form file of yours and add it to another Panel as a child.
> >>>>
> >>>> See chapter 4 "Keeping control over HTML" of the Wicket Free Guide
at:
> >>>> http://code.google.com/p/wicket-guide/
> >>>>
> >>>> Also available from under the Learn section as the Books link on
> >>>> the right side navigation section on Wicket's home page at:
> >>>> http://wicket.apache.org/learn/books/
> >>>>
> >>>> ~ Thank you,
> >>>> Paul Bors
> >>>>
> >>>> -----Original Message-----
> >>>> From: Daniel Watrous [mailto:dwmaill...@gmail.com]
> >>>> Sent: Tuesday, July 16, 2013 7:13 PM
> >>>> To: users@wicket.apache.org
> >>>> Subject: Re: Form questions
> >>>>
> >>>> Thanks Paul and Sven. I got the form to work and available in the
> >>>> onSubmit handler.
> >>>>
> >>>> Now I'm interested in splitting the form out into it's one file.
> >>>> So I created a class that has nothing more than the form, but I'm
> >>>> not sure how to include this into a page.
> >>>>
> >>>> In my class I do this:
> >>>>
> >>>> public class CnavModify extends ConsoleBasePage {
> >>>>
> >>>> public CnavModify(PageParameters parameters) {
> >>>> super(parameters);
> >>>>
> >>>> Form form = new CnavForm("cnavFormArea");
> >>>> add(form);
> >>>> }
> >>>> }
> >>>>
> >>>> My CnavModify obviously extends a base page. What do I put inside
> >>>> the <wicket:extend> tag to have the form render?
> >>>>
> >>>> Daniel
> >>>>
> >>>>
> >>>> On Tue, Jul 16, 2013 at 12:00 AM, Sven Meier <s...@meiers.net> wrote:
> >>>>
> >>>> > Hi,
> >>>> >
> >>>> >
> >>>> > Some problems I can't figure out. The code to create the
> >>>> > button complains
> >>>> >> that it requires a CnavUrl but gets back a String.
> >>>> >>
> >>>> >> add(new Button("publish", model) {
> >>>> >> @Override
> >>>> >> public void onSubmit() {
> >>>> >> CnavUrl cnavUrl = (CnavUrl) getModelObject();
> >>>> >> System.out.println("publish");
> >>>> >> }
> >>>> >> });
> >>>> >>
> >>>> >
> >>>> > a Button always has a IModel<String> to fill the value attribute.
> >>>> > Note that in #onSubmit() you're getting the model object of the
> >>>> > button, not of your form.
> >>>> > You can write:
> >>>> >
> >>>> > add(new Button("publish", model) {
> >>>> >> @Override
> >>>> >> public void onSubmit() {
> >>>> >> CnavUrl cnavUrl = (CnavUrl)
> >>>> MyForm.this.getModelObject();
> >>>> >> System.out.println("publish");
> >>>> >> }
> >>>> >> });
> >>>> >>
> >>>> >
> >>>> > Using generic types in your code should help you.
> >>>> >
> >>>> > Sven
> >>>> >
> >>>> >
> >>>> >
> >>>> > On 07/15/2013 11:41 PM, Daniel Watrous wrote:
> >>>> >
> >>>> >> Hello,
> >>>> >>
> >>>> >> I'm interested in creating a single Form that will accommodate
> >>>> >> the following use cases
> >>>> >> 1) display blank for creating new records
> >>>> >> 2) pre-populate for editing existing records
> >>>> >> 3) map submitted values on to an existing domain object
> >>>> >> 4) accommodate two actions, Save Draft -or- Publish
> >>>> >>
> >>>> >> I'm following Wicket in Action and within my Form constructor
> >>>> >> I create my model, like this
> >>>> >>
> >>>> >> CnavUrl cnavUrl = new BasicCnavUrl();
> >>>> >> IModel model = new Model((Serializable) cnavUrl);
> >>>> >> setModel(model);
> >>>> >>
> >>>> >> I then use PropertyModel
> >>>> >>
> >>>> >> add(new TextField("url", new PropertyModel(cnavUrl,
> >>>> >> "url")));
> >>>> >>
> >>>> >> For the two actions, I'm creating the Button objects like this
> >>>> >>
> >>>> >> add(new Button("publish", model) {
> >>>> >> @Override
> >>>> >> public void onSubmit() {
> >>>> >> CnavUrl cnavUrl = (CnavUrl) getModelObject();
> >>>> >> System.out.println("publish");
> >>>> >> }
> >>>> >> });
> >>>> >>
> >>>> >> Some problems I can't figure out. The code to create the
> >>>> >> button complains that it requires a CnavUrl but gets back a
String.
> >>>> >>
> >>>> >> It seems that a new BasicCnavUrl is created once with the Form.
> >>>> >> What happens on subsequent calls? Can I always expect my model
> >>>> >> to have the data from the current form submission?
> >>>> >>
> >>>> >> Is there a best way to incorporate the idea of an edit, where
> >>>> >> the model is pre-populated from a data source and pre-fills
> >>>> >> the Form
> >>>> fields?
> >>>> >>
> >>>> >> Thanks,
> >>>> >> Daniel
> >>>> >>
> >>>> >>
> >>>> >
> >>>> > ------------------------------**------------------------------*
> >>>> > *-
> >>>> > -----
> >>>> > --- To unsubscribe, e-mail:
> >>>> > users-unsubscribe@wicket.**apache.org
> >>>> <users-unsubscribe@wicket.apache.
> >>>> > org> For additional commands, e-mail:
> >>>> > org> users-h...@wicket.apache.org
> >>>> >
> >>>> >
> >>>>
> >>>>
> >>>> -----------------------------------------------------------------
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> >>>> For additional commands, e-mail: users-h...@wicket.apache.org
> >>>>
> >>>>
> >>>
> >>
> >
>
>
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