Need to Understand CheckGroup and Check

[Fang Lin <Fa...@u.washington.edu>]

The examples at
http://wicketstuff.org/wicket13/compref/;jsessionid=2AF2BC5B8195BE6BA0EFADE26E35292F?wicket:bookmarkablePage=:org.apache.wicket.examples.compref.CheckGroupPage
and http://cwiki.apache.org/WICKET/listview-with-checkboxes.html provided some help, but don't have enough details, such as how to pre-set the Checkbox to be checked. The CheckGroup is not covered in Wicket books.

Could someone who has used CheckGroup verify if this is the right way to use CheckGroup and Check?

CheckGroup itemGroup = new CheckGroup ("group",  selection);
   // the selection is a List<Item> representing the possible choices

    form.add (itemGroup);
itemGroup.add ( new CheckGroupSelector ("groupselector",  itemGroup));
// for (un)check all

   // the listOfSelected is a List<Item> representing the items currently checked
    ListView itemList = new ListView("item_list", listOfSelected) {

                protected void populateItem(ListItem item) {

                  Item t = (Item)item.getModelObject();

                  item.add (new Check ("ckbox_item",
                                                                  item.getModel(),
                                                                  itemGroup));

                  item.add (new Label("item_title", t.getName()));
                }
      };
    itemGroup.setReuseItems(true);
    itemGroup.add(itemList);

Re: Need to Understand CheckGroup and Check

["Mathias P.W Nilsson" <ma...@snyltarna.se>]

The selection variable is a collection or a wicket model with an object of
collection. You can preselect you values by using the same classes there.

Consider this

Form<String> form = new Form<String>( "form" );
		
String[] someStrings = new String[]{ "Wicket" , "Hibernate", "Maven",
"Spring" };
String[] other = new String[]{ "Wicket" , "Hibernate", "Maven", "Spring",
"C#", "NHibernate" };
CheckGroup<String> group = new CheckGroup<String>( "group", Arrays.asList(
someStrings ) );
ListView<String> stringView = new ListView<String>( "stringView" ,
Arrays.asList( other ) ){
  private static final long serialVersionUID = 1L;
  @Override
  protected void populateItem(ListItem<String> item) {
    item.add( new Check<String>( "item", item.getModel() ));
  }
			
};
		
group.add( stringView );
form.add( group );
add( form );



Here the someStrings will be checked, that is ( "Wicket" , "Hibernate",
"Maven", "Spring" ). NHibernate and C# will not be checked.
Hope this helps.

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