SelectItems are a pain in that they are a model that does not store selected
state. The Seam DataBinding framework was designed for binding and selecting
of model objects that do store extra selected state, like DataModel.
If you want to go the easiest route you can simply not have a DataSelector for
your SelectItems. Simply use the <h:selectOneMenu/> value attribute and couple
this to a property on your controller. Where selector is the controller and
items are the bijected SelectItems list.
| <h:selectOneListbox size="10" value="#{selector.selected}">
| <f:selectItems value="#{items}"/>
| </h:selectOneListbox>
|
| private String selected = "Mark";
|
| public String getSelected()
| {
| return selected;
| }
|
| public void setSelected(String selected)
| {
| this.selected = selected;
| }
|
| @SelectItems(valueStrategy=SelectItems.Strategy.STRING)
| public List items;
|
| @Factory("items")
| public List getItems()
| {
| items = new ArrayList();
| items.add("Jim");
| items.add("Dan");
| items.add("Mark");
| ArrayList<String> subgroup = new ArrayList<String>();
| subgroup.add("Other Developers");
| subgroup.add("Steve");
| subgroup.add("Ananda");
| items.add(subgroup);
| return items;
| }
|
To answer your question about the selector firing. Unless something is
returned from DataBinder.getSelection() your selector won't fire. And since
<h:selectOneMenu/> doesn't set the selected state on your #items, it's hard to
do anything with the getSelection() method.
I've been happy with the solution above, however if you really needed
SelectItemsSelection support like DataModelSelection, then instead of a
DataSelector, I'd write another DataBinder for your <h:selectOneMenu/> value
object.
Add a 'for' attribute to your SelectItemsSelection annotation so that you can
get to it later. Then within your SelectItemsSelectionBinder's
wrap/getWrappedData methods, do a lookup for your scoped SelectItems component
and do the translation based on whatever value strategy you're using for your
SelectItems (might need to include valueStrategy attribute in your
SelectItemsSelection annotation).
This might be a fun project for the weekend. If I get to it I'll try and post
my solution. Hope this helps.
-Jim
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