Maybe the description was to long, and it's hard to follow... I'll try to
make it shorter:
Using DropDownChoice component this way inside the populate method of the
gridView:
DropDownChoice selYear = new DropDownChoice("year",
new PropertyModel(item.getModel(), "year"), modelChoices);
makes the PropertyModel behave different, depending on modelChoices
implementation... If modelChoices model is constructed in a static way,
everything works ok, otherwise - it does not work. Do you have any idea why
it happens?
Thank you!
Alex Objelean wrote:
>
> First of all, the functional description:
> I have a screen with the table which contains on each line a column with
> description, a dropDownChoice (DDC) with a list of configurations and
> another column with DDC with a list of years. When user changes a
> configuration , the list of years updates depending on selected
> configuration (using ajax).
>
> Below you can find the code.
>
> /**
> * @see RefreshingView#populateItem(Item)
> */
> protected void populateItem(final Item item) {
> //get the configuration list
> List configurationList = ...//call a service to get the list
> DropDownChoice selConfig = new DropDownChoice("configuration",
> new PropertyModel(item.getModel(), "configuration"),
> configurationList, new ChoiceRenderer(
> "description", "id"));
> item.add(selConfig);
>
> IModel modelChoices = new Model() {
> public Object getObject(final Component component) {
> List rValue = Collections.EMPTY_LIST;
> ReportTemplateUI report = (ReportTemplateUI) item.getModelObject();
> Configuration config = report.getConfiguration();
> if (config == null) {
> return rValue;
> }
> rValue = getExtractionResultService().getAvailableYears(
> config.getId());
> return rValue;
> }
> };
> DropDownChoice selYear = new DropDownChoice("year",
> new PropertyModel(item.getModel(), "year"), modelChoices);
> item.add(selYear);
> //...
> }
>
>
> The modelObject of the Item looks like this:
>
> ReportTemplateUI implements Serializable{
> private Integer year;
> private Configuration configuration;
> //other properties + getters & setters
> }
>
> As you can see, the DDC is constructed this way: it uses a PropertyModel
> for setting the "year" property on the item model; the modelChoices (used
> to populate the DDC component) based on the Item current configuration,
> calls a service and returns a list of years associated with the selected
> configuration.
>
> Now the problem is that the PropertyModel does not set the year property
> on the Item objectModel - the year property always have the NULL value.
> Somehow I found that the problem is caused by calling item.getModelObject,
> but it does not make sens for me (!?!).. If instead of this I return a
> static list, everything seems to work fine... (@see below)
>
> IModel modelChoices = new Model() {
> public Object getObject(final Component component) {
> List rValue = Collections.EMPTY_LIST;
>
> // THE PROBLEM IS HERE - CALLING Item.getModleObject() method. !!!
> ReportTemplateUI report = (ReportTemplateUI) item.getModelObject();
>
> Configuration config = report.getConfiguration();
> if (config == null) {
> return rValue;
> }
> rValue = getExtractionResultService().getAvailableYears(
> config.getId());
>
> //IF INSTEAD OF ABOVE CODE I RETURN A STATIC LIST - EVERYTHING WORKS
> FINE
>
> return rValue;
> }
> };
> DropDownChoice selYear = new DropDownChoice("year",
> new PropertyModel(item.getModel(), "year"), modelChoices);
>
> I found a workaround for this but it is a temporary solution until I find
> the answer to this mysterious issue.
> Is it a known issue, a bug, or this is not a correct approach to solve the
> problem? Can you help me?
>
> Thank you!
>
> PS: if you have any question regarding the code or anything else is not
> clear, please don't hesitate to ask! Thank you again!
>
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