oops i think i spoke too soon...
so when u click on the select/deselect btns in the palette wouldnt those
update the collection that is being referred by the selected property?
(visit.user.spokenLanguages from the eg below)
i do a get on this collection and i dont see any changes to its size?
i swear my code is ditto to what rob has in his example :)
From: "Dan " <[EMAIL PROTECTED]>
Reply-To: "Tapestry users" <[email protected]>
To: [email protected]
Subject: Re: Multiple Select
Date: Thu, 14 Jul 2005 18:47:30 +0000
Ahh...i understand my mistake. thanks so much rob. ur help is invaluable!
i had my code setup exactly the same...but heres wat i wasnt paying attn
to:
i was trying to add "instances" to the selected list which were "not" part
of the model...and thus they would never appear!
rocking! its works dude! ;)
From: Robert Zeigler <[EMAIL PROTECTED]>
Reply-To: "Tapestry users" <[email protected]>
To: Tapestry users <[email protected]>
Subject: Re: Multiple Select
Date: Thu, 14 Jul 2005 13:05:38 -0500
Dan wrote:
> hmm..i dont recognize the link though, between overriding equals and
> initializing the selected List ?
> maybe i m not on the same page as u :( i assume u r referring to
> overriding equals of the objects(model) inside the list? if thats the
> case, i already ve done that. could you please elaborate more?
So, you've got your palette component...
parameter: selected, and model...
model contains the list of all possible selected values, right?
So... using the ListPropertySelectionModel, I'll put together a quick
example... something like:
public class User {
public List getSpokenLanguages() {
...
}
public void addToSpokenLanguages(Language l) {
getSpokenLanguages().add(l);
}
...
}
public class Language implements NamedListItem {
private String name;
public String getItemName() {
return name;
}
public Language(String name) {
this.name=name;
}
}
template:
...
<select jwcid="@contrib:Palette"
selected="ognl:visit.user.spokenLanguages" model="ognl:languageModel"/>
page.java:
...
IPropertySelectionModel languageModel=null;
public IPropertySelectionModel getLanguageModel() {
if (languageModel == null) {
List languages = new ArrayList();
languages.add(new Language("English"));
languages.add(new Language("French"));
languages.add(new Language("Japanese"));
}
return languageModel;
}
So... then the question is... suppose that you need to have some
languages preselected...
The first key is to have those languages in the list returned by
"getSpokenLanguages". Now, suppose that you know that every user
of your particular system at least speaks english, so, in your init
code for the user, you do something like:
this.addToSpokenLanguages(new Language("English"));
Now when you hit the palette page, "English" will NOT be in the selected
page still. Because the "English" instance in the "SpokenLanguages"
list is different than the instance in the model. So, the second
key is to make sure that equals returns true when it should.
(Or else, the second key is to ensure that the instances actually are
the same. :)
So, going back to the language class...
public class Language ... {
...
public boolean equals(Object o) {
return o!=null && o instanceof Language &&
((Language)o).getItemName().equals(this.name);
}
}
With that addition, and with the bit of init code above (add english to
the spoken language list), then when you hit the page with the palette
component, "English" will be selected.
Robert
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