Thanks. I'll give your examples/suggestions a try.
Peter
igor.vaynberg wrote:
>
> dropdownchoice works like this:
>
> DropDownChoice<T>(String id, IModel<T> model, IModel<List<T>> choices,
> IChoiceRenderer<T>)
>
> but from your description i see you are using it like this:
>
> DropDownChoice<String>(String id, IModel<String>,
> IModel<List<DateChoice>>,
> IChoiceRenderer<DateChoice>)
>
> i take it studentSince is a String?
>
> DropDownChoice works with objects, not their id values. so it is one of
> the
> objects you pass in as choices that gets put into the model. looks like
> you
> are putting in DateChoice objects into the choices, but your model prefers
> a
> string.
>
> it probably works the first time because DateChoice.toString() returns the
> id?
>
> what you want is something like this:
>
> final Map<String,String> codeToText=new LinkedHashMap();
> codeToText.put("20041", "2004,Fall");
> ...
> List<String> keys=new ArrayList<STring>();
> keys.addall(codeToText.keyset());
> IChoiceRenderer renderer=new IChoiceRenderer() {
> getid(Obect o) { return o.toString(); }
> getValue(Object o) { return codeToText.get(o.toString()); }
> }
>
> new DropDownChoice("foo", new PropertyModel(...), keys, renderer);
>
> another approach would be to write a model that does the translation
> between
> string and datechoice. use whatever route appeals to you more.
>
> -igor
>
>
> On 1/13/07, pboyd <[EMAIL PROTECTED]> wrote:
>>
>>
>> Hi,
>>
>> I'm having some trouble getting a DropDownChoice component to bind the
>> value
>> I want to the supplied model and could use some help. More specifically,
>> I've created a custom dropdown by extending DropDownChoice (see below)
>> because I need to use a custom value for the hidden value attribute in
>> the
>> HTML option tag and a more readable version of that value for display.
>> The
>> hidden value needs to be bound to the model, not the display value.
>> Everything renders and binds to the model properly the first time the
>> user
>> fills out and submits the form. The problem appears when the user returns
>> to
>> the form (which will display his/her previous choices) and tries to
>> update
>> the selection in the dropdown. For some reason unknown to me the when the
>> user updates the form, the value from the dropdown that is passed to the
>> model is the (undesired) display value instead of the (desired) hidden
>> value
>> attribute data that is passed to it the first time the form is submitted.
>>
>> Thoughts?
>>
>> Thanks,
>> Peter
>>
>>
>>
>> Package…
>> Import…
>>
>> public class DateDropDownChoice extends DropDownChoice implements
>> Serializable {
>> // values to go into the hidden value attribute in the HTML option
>> tag
>> // AND to go into the model/database
>> final static private String[] ids =
>> {"20031","20032","20033","20034","20041",…};
>>
>> // values to be displayed in the dropdown
>> final static private String[] values ={"2003, Fall","2003,
>> Winter","2003, Spring","2003, Summer","2004, Fall",…};
>>
>> public DateDropDownChoice(String id, IModel iModel) {
>> super(id, iModel);
>> ArrayList choices = new ArrayList();
>>
>> int i = 0;
>> for(;i<ids.length;i++)
>> // choices.add(new DateChoice(ids[i],values[i]));
>> choices.add(values[i]);
>>
>> this.setChoices(choices);
>> this.setChoiceRenderer(new CustomChoiceRenderer());
>> }
>>
>>
>>
>> class CustomChoiceRenderer implements IChoiceRenderer{
>>
>>
>> public Object getDisplayValue(Object obj) {
>> return obj.toString();
>> }
>>
>> public String getIdValue(Object obj, int i) {
>>
>> /**
>> * An "i" of -1 is passed when a previous selection
>> * has been made and is stored, so just return the obj string
>> value
>> * because it is a properly stored value such as "20063" from
>> the previous submission
>> *
>> * An "i" > 0 means that I need to look up the
>> appropriate/corresponding
>> * value from the ids array.
>> *
>> */
>>
>> String returnVal = i<0?obj.toString():ids[i];
>> System.out.println("returnVal: "+returnVal+" :: ID:: "+i);
>> return returnVal;
>> }
>> }
>> }
>>
>> And then in my form I set up the custom dropdown.
>>
>> //…
>>
>> DateDropDownChoice studentSince =
>> new DateDropDownChoice("studentSince",new
>> PropertyModel(iModel,"studentSince"));
>> add(studentSince);
>>
>> //…
>>
>> --
>> View this message in context:
>> http://www.nabble.com/DropDownChoice-inconsistent-value-returned-tf2971300.html#a8314245
>> Sent from the Wicket - User mailing list archive at Nabble.com.
>>
>>
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