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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