Re: Forms and Listview questions..?

Nino Saturnino Martinez Vazquez Wael Tue, 20 Nov 2007 04:54:07 -0800


Gwyn Evans wrote:

On 20/11/2007, Nino Saturnino Martinez Vazquez Wael
<[EMAIL PROTECTED]> wrote:

Bump for replies..? Does my mail make sense? Do I need to specify
anything further?

Nino Saturnino Martinez Vazquez Wael wrote:

Hi

I've been "playing" with both forms and listviews. And I wanted to
extend a form creating my own form that has captcha validation as
standard, I cant just seem to find where to place the markup when
extending Form?


Well, off-hand, I'd expect that the easiest way would be to do it
using markup inheritance -
http://wicket.apache.org/examplemarkupinheritance.html.

Hm the link you gave talks about inheritance for a page. However thiswould mean that I had to put the <wicket:child> into the form in orderto add stuff to the form right? What about inheritance for a panel, thatway I could use it as a form. However I got some strange errors whentrying todo this. Heres some pseduo



panel.html

<wicket:panel>

<img wicket:id="myCaptchaimg"></img>

<form wicket:id="form">

<input wicket:id="captchamatchingtext" />
<wicket:child>
</form>
</wicket:panel>

panel.java

private final Form form

panel(String id)
{
super(id);
form=new Form("form");
add(form);

form.add(new textfield..)
add(new captcha...);
}

public addToForm(Component child){
form.add(child);
}

Then the extending panels can add more stuff to the form.. Is thissupposed to work?

I then tried doing it with a panel but also ran into
sometroubles.

Also I've been noticing that if you use a compound model with a
listview forexample my page has a  compound model called article I add
the listview new listview("comments"). I would expect my item in the
populate implementation to get fed a comment compoundmodel, but it
does only get the compound model for the page, I then have to call
item.getModelObject and set the compundmodel manually. Is this
something that has been overseen, or am I missing the bigger picture?


I think so...  Compare this...

HTML:
        <ul wicket:id="comments">
                <li wicket:id="comment">Dummy comment</li>
        </ul>

Java: (compressed for vertical size!)

  class Article {
    private List comments = Arrays.asList(new String[]{"Comment One",
"Comment Two", "Comment Three"});
    public List getComments() { return comments; }
  }

and

  public MyPage(final PageParameters parameters) {
    setModel(new CompoundPropertyModel(new Article()));
    ListView listView = new ListView("comments") {
      protected void populateItem(ListItem item) {
        item.add(new Label("comment", (String)item.getModelObject()));
      }
    };
  }
  add(listView);

gives the following output:

    * Comment One
    * Comment Two
    * Comment Three


/Gwyn

This is what I meant extending your example a but, it feels odd to makean extra compoundpropertymodel:


class Article {
   private List<comment> comments=new arraylist<comments>...
   public List getComments() { return comments; }
 }
class Comment{
        private String text...
        private String author
        ....trival getters and setters...
}

public MyPage(final PageParameters parameters) {
   setModel(new CompoundPropertyModel(new Article()));
   ListView listView = new ListView("comments") {
     protected void populateItem(ListItem item) {
        setModel(new *CompundPropertyModel*(item.getModelObject()
))
       item.add(new Label("comment"));
       item.add(new Label("author"));

     }
   };
 }
 add(listView);





--
Nino Martinez Wael
Java Specialist @ Jayway DK
http://www.jayway.dk
+45 2936 7684


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