There are few issues with your ValueEncoder:
1) It should transform a Student into a String and vice versa.
2) It should be stateless, so don't pass any parameters to the constructor.
Better is to fetch the Student by id from any storage like db.
Furthermore you don't need to implement your own SelectModel. Just pass the
list of Students to the model parameter, Tapestry will do the rest.
On Sat, Feb 19, 2011 at 7:24 AM, dwi ardi irawan <penyihirke...@gmail.com>wrote:
> I'm trying to make a palette using list of bean. And I can't find solution
> how to do this. Especially with the encoder thing.
> can anyone help me? sorry for posting this long source code, just to make
> sure what is wrong with my code.
> Error:
> Render queue error in SetupRender[palette/UsingBean:palette]:
> org.makeasoup.tapestryboard.beans.Student cannot be cast to java.util.List
>
> *PaletteUsingBean.tml
>
> *<div>
> <form t:type="form">
> <span t:type="palette" encoder="studentEncoder"
> model="studentModel" selected="selectedStudentList"/>
> <input type="submit" value="Submit"/>
> </form>
> </div>
>
> *PaletteUsingBean.java*
>
> public class PaletteUsingBean {
> @Persist(PersistenceConstants.FLASH)
> @Property
> private Student student;
>
> @Property
> @Persist(PersistenceConstants.FLASH)
> private List<Student> selectedStudentList;
>
> private List<Student> studentList;
>
> public List<Student> getStudentList() {
> if(studentList==null){
> studentList = new ArrayList<Student>();
> studentList.add(new Student("Dwi Ardi Irawan", (new
> GregorianCalendar(8, Calendar.APRIL, 1984)).getTime(), "5106100506"));
> studentList.add(new Student("Tri Aditya Sasongko", (new
> GregorianCalendar(11, Calendar.NOVEMBER, 1988)).getTime(), "5106100507"));
> studentList.add(new Student("No Name", (new GregorianCalendar(1,
> Calendar.JANUARY, 2011)).getTime(), "5106100508"));
> }
> return studentList;
> }
>
> public SelectModel getStudentModel(){
> return new StudentSelectionModel(getStudentList());
> }
>
> public StudentValueEncoder getStudentEncoder(){
> return new StudentValueEncoder(getStudentList());
> }
> }
>
> *StudentSelectionModel.java*
>
> public class StudentSelectionModel implements SelectModel {
> private List<Student> studentList;
>
> public StudentSelectionModel(List<Student> studentList) {
> this.studentList = studentList;
> }
>
> public List<OptionGroupModel> getOptionGroups() {
> return getSelectModel().getOptionGroups();
> }
>
> public List<OptionModel> getOptions() {
> return getSelectModel().getOptions();
> }
>
> public void visit(SelectModelVisitor visitor) {
>
> for (OptionGroupModel optionGroupModel :
> getSelectModel().getOptionGroups()) {
> visitor.beginOptionGroup(optionGroupModel);
> for (OptionModel optionModel : optionGroupModel.getOptions()) {
> visitor.option(optionModel);
> }
> visitor.endOptionGroup(optionGroupModel);
> }
>
> }
>
> public SelectModel getSelectModel(){
> List<OptionModel> optionModelList = new ArrayList<OptionModel>();
>
> for (Student student : studentList) {
> optionModelList.add(new OptionModelImpl(student.getName(),
> student));
>
> }
> return new SelectModelImpl(new OptionGroupModelImpl(null, false,
> optionModelList));
> }
>
> }
>
> *StudentValueEncoder.java*
>
> public class StudentValueEncoder implements ValueEncoder<List<Student>>{
> private List<Student> studentList;
>
> public StudentValueEncoder(List<Student> studentList) {
> this.studentList = studentList;
> }
>
> public String toClient(List<Student> studentList) {
> return null;
> }
>
> public List<Student> toValue(String value) {
> List<Student> selectedStudentList = new ArrayList<Student>();
> for(Student student : studentList) {
> if(student.getNrp().equals(value)) {
> selectedStudentList.add(student);
> }
> }
> return selectedStudentList;
> }
>
> }
>
--
Best regards,
Igor Drobiazko
http://tapestry5.de
