On Friday, 30 March 2007 08:07 am, Andrew Moore escreveu:
> I've got a simple option class (as i've seen in examples)<p/>
>
>
> public class Option {
> String key;
> String value;
>
> public String getKey() {
> return key;
> }
>
> public void setKey(String key) {
> this.key = key;
> }
>
> public String getValue() {
> return value;
> }
>
> public void setValue(String value) {
> this.value = value;
> }
>
> public Option(String key, String value) {
> this.key = key;
> this.value = value;
> }
> }
>
>
> I then populate an ArrayList (called imageList) with several entries of the
> Option class.<p/>
>
> Then I add a dropdownchoice component to my form using:
> ChoiceRenderer choiceRenderer = new ChoiceRenderer("value", "key");
> form.add(dropDownChoice = new DropDownChoice("imageCollectionId",
> imageList, choiceRenderer));
>
> This works fine to display the key and value bits correctly in the html,
> but then how do I get out the key and value properties.
>
> The only way I've found so far is to have the imageCollectionId attribute
> in my POJO business object of type Option, whereas I only want it to be of
> type String - where it should just hold the 'key' value of the Option
> class.
>
> All I want is to get at the 'key' value, but display the 'value' on the
> screen.
>
> Hope that makes some sense, it's been puzzling me all day, and I thought it
> would be so simple.
> Cheers
What I've found useful is to use a converter. I use 1.2.5 and an
IConverter. I don't fully understand a type converter, as it seems to only
go one way. So I have an Area object and an ITypeConverter would only take
an Area and return a string, but I couldn't figure out how to have a string
and get an Area. So I use an IConverter. And I create my drop down
choice this way:
new DropDownChoice( ... )
{
public IConverter getConverter()
{
return new AreaConverter( _areaDao );
}
};
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