I have this page class. When submitting the form via the AjaxButton I get a
null pointer exception.
It passes the instanceof in onSubmit but all data is null. I dont get this.
In the LoadableDetachable model I do new CartItem and when displaying the
page the first time I see the drop down choice correctly.
public class ItemPage extends RootPage {
Long itemId;
Item item;
WebPage backPage;
public ItemPage(){
throw new RestartResponseAtInterceptPageException(Base.class);
}
public ItemPage( PageParameters parameters ){
this( parameters , null );
}
public ItemPage( PageParameters parameters, WebPage backPage ){
this.backPage = backPage;
try{
itemId = new Long( parameters.getString( "ItemId", "" )
);
}catch( NumberFormatException nex ){
throw new
RestartResponseAtInterceptPageException(Base.class);
}
item = getItemDao().getItem( itemId );
if( item == null )throw new
RestartResponseAtInterceptPageException(Base.class);
IModel cartItemsModel = new LoadableDetachableModel(){
private static final long serialVersionUID = 1L;
@Override
protected Object load() {
List<SubItem> subItems =
getItemDao().getSubItems(item);
List<CartItem> cartItems = new
LinkedList<CartItem>();
for( SubItem subItem : subItems ){
if( subItem.getBalance() > 0 ){
StringBuffer buf = new
StringBuffer();
for( Attribute attribute :
subItem.getAttributes() ){
buf.append(
attribute.getData() + " : " );
}
if( buf.length() > 0 ){
buf.delete(buf.length()
- 3, buf.length() );
}
CartItem item = new CartItem();
item.setAmount( 1 );
item.setSubItem(subItem);
item.setAttributes(
buf.toString() );
cartItems.add( item );
}
}
return cartItems;
}
};
final DropDownChoice choice = new DropDownChoice( "subItems",
new Model(),
cartItemsModel, new ChoiceRenderer( "attributes", "subItem.id" ) );
choice.setNullValid( true );
Form itemForm = new Form( "itemForm" );
AjaxButton addToCart = new AjaxButton( "addToCart" , itemForm ){
private static final long serialVersionUID = 1L;
@Override
protected void onSubmit(AjaxRequestTarget target, Form
form ) {
target.addComponent( this );
if( choice.getModelObject() instanceof CartItem
){
System.out.println(
choice.getModelObject() );
Cart cart = getCart();
CartItem item = (CartItem) getModel();
System.out.println(
item.getAttributes() );
//cart.addCartItem( (CartItem)
getModelObject() );
//updateCart();
}
}
};
addToCart.setOutputMarkupId( true );
itemForm.add( addToCart );
itemForm.add( choice );
add( itemForm );
Link back = new Link( "backLink" ){
private static final long serialVersionUID = 1L;
@Override
public void onClick() {
setResponsePage( getBackPage() );
}
};
if( getBackPage() == null ) back.setVisible( false );
add( back );
}
public WebPage getBackPage() {
return backPage;
}
}
public class CartItem implements Serializable{
private static final long serialVersionUID = 1L;
private int amount;
private SubItem subItem;
private String attributes;
public int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
public SubItem getSubItem() {
return subItem;
}
public void setSubItem(SubItem subItem) {
this.subItem = subItem;
}
public String getAttributes() {
return attributes;
}
public void setAttributes(String attributes) {
this.attributes = attributes;
}
}
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