to quickly do it right in your example:
you should do it in reverse.
so this:
for(;i<ids.length;i++)
choices.add(values[i]);
should be
for(;i<ids.length;i++)
choices.add(ids[i]);
so the id's are the valules/choices not the display values. Thats done in
the choicerenderer:
public Object getDisplayValue(Object obj) {
// obj == id, lookup id in id array then return value out of
value array.
}
public String getIdValue(Object obj, int i) {
return obj; // obj == the id
}
hopefully this will make it also more clear to other people, because this
question does popup again and again. :(
To many people come from the Swing world, with its Cell renderers :(
johan
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;
}
}
}
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