Just FYI, SimpleConverterAdapter was added to Wicket a while ago to
make writing specific two-way converters a bit easier. Don't forget to
read the Javadocs though.
After the recent converter backport in 1.3, they are not as relevant.
Eelco
On 4/2/07, Thomas R. Corbin <[EMAIL PROTECTED]> wrote:
> 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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