aaah...thats a gotcha! i had a listner on a submit in the form that checked
for size...movie the checking to listner of the form and voila! ... yes the
rewind..i keep forgettin it ..grrr .. thx again rob
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 16:43:51 -0500
yeah, so, if you move the stuff around like they should be moved around
and then submit the form, then /after/ the palette component has been
rendered in the "rewind" stage of the submission, your collection should
be updated; where are you checking the collection size?
Robert
Dan wrote:
> 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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>>>
>>
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