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控制ClassChoice继承CheckBoxMultipleChoice。这是在多个页面上使用的通用控件，其中会话中保留了选择。可用选项从数据库中获得。当有多个数据项时，添加“全部”复选框。在某些页面上，选择更改会导致页面被新数据刷新。在其他页面上，选择应该更改而不刷新。如何更新CheckBoxMultipleChoice的模型？
我的问题是，当其他复选框更改时，我需要控制“所有”复选框，并在“全部”复选框更改时更改所有复选框。
我试图拨打updateModel()强制更改，但没有奏效。如何在不刷新页面的情况下更改选择（model参数）？
此编辑的代码不显示页面刷新。
public class ClassChoice<T> extends CheckBoxMultipleChoice
{
private static final long serialVersionUID = 1L;
@SpringBean
private ClassService classService;
List<EntityClassModel> selection;
EntityClassModel ecmAll;
static List<EntityClassModel> availableClasses;
public ClassChoice(..)
{
super("classcheckboxes");
setSuffix(" "); // sets checkbox separator and ensures inline display
ecmAll = (EntityClassModel) modelFactory.getNewClassModel();
ecmAll.setClassname("All");
// List of all classes associated with user
availableClasses = classService.getListOfClasses(..);
setClassChoices();
add(new AjaxFormChoiceComponentUpdatingBehavior()
{
private static final long serialVersionUID = 1L;
@Override
protected void onUpdate(AjaxRequestTarget target)
{
List<Integer> previousIDs = UserSession.get().getSelectedClassIDs();
if ((previousIDs.size() > 0) && ((previousIDs.size() + 1) >= availableClasses.size()))
{
// Was previously Select All
if (selection.get(selection.size() - 1) == ecmAll)
{
// Select All still selected, remove it
selection.remove(selection.size() - 1);
}
else
{
// Remove all selections
selection.clear();
}
}
else if (selection.size() > 0)
{
// Was none or some selected
if (selection.get(selection.size() - 1) == ecmAll)
{
// Select All, select all available
selection.clear();
selection.addAll(availableClasses);
}
else if ((selection.size() + 1) >= availableClasses.size())
{
// Is now full, add Select All
selection.add(ecmAll);
}
// else change but no special handling required
}
// else none are currently selected
UserSession.get().setSelectedClasses(selection);
// Generate a list of selected class IDs, excluding All
List<Integer> selectedIDs = new ArrayList<Integer>();
int copysize = selection.size();
if ((copysize > 0) && (selection.get(copysize - 1) == ecmAll))
{
copysize--;
}
for (int index = 0; index < copysize; index++)
{
selectedIDs.add(selection.get(index).getId());
}
UserSession.get().setSelectedClassIDs(selectedIDs);
// Update the selections on the page
updateModel();
}
});
Initialize();
}
@SuppressWarnings("unchecked")
protected void Initialize()
{
// Grabs already selected classes from UserSession
List<Integer> selectedIDs = UserSession.get().getSelectedClassIDs();
selection = classService.getClassesByClassIDs(selectedIDs);
if (selectedIDs.size() > 1)
{
if ((selectedIDs.size() + 1) >= availableClasses.size())
{
selection.add(ecmAll);
}
}
setModel(Model.ofList(selection));
// Configure the data and display
setChoiceRenderer(new ChoiceRenderer<EntityClassModel>("classname", "id"));
setOutputMarkupId(true);
}
@SuppressWarnings("unchecked")
public void setClassChoices()
{
// Adds 'All' option when there is more than one class
if (availableClasses.size() > 1)
{
availableClasses.add(ecmAll);
}
setChoices(availableClasses);
}
public List<EntityClassModel> getSelection()
{
return selection;
}
}