Wicket數據表擴展

Question

我們可以在另一個DataTable中擴展DataTable嗎？

我的情況是我想建立一個名爲DataTable其中BaseTable包含三列：id，name，color。我想要建立另一個名爲Table1的表格，它擴展了BaseTable並且有另一列：size;和Table2其中也延伸BaseTable和另一個複選框列。

是否有可能做到這樣的事情？如果可能的話，你能給我一些例子或指導方針嗎？

更新

謝謝您的幫助！這似乎是我想要的答案，但我沒有你說的到底是什麼，但我最終得到這個錯誤：

WicketMessage: The component(s) below failed to render. A common problem is that you have added a component in code but forgot to reference it in the markup (thus the component will never be rendered). 

1. [MarkupContainer [Component id = dt_basecontract_list]] 
2. [MarkupContainer [Component id = body]] 
3. [MarkupContainer [Component id = rows]] 
4. [MarkupContainer [Component id = 1]] 
5. [MarkupContainer [Component id = cells]] 
6. [MarkupContainer [Component id = 1]] 
7. [Component id = cell] 
8. [MarkupContainer [Component id = 2]] 
9. [Component id = cell] 
10. [MarkupContainer [Component id = 3]] 
11. [MarkupContainer [Component id = cell]] 
12. [MarkupContainer [Component id = detail]] 
13. [MarkupContainer [Component id = delete]] 

情況下你需要有信息..

基類：ContractBasePanel

// A Base Contract DataTable Panel 
public class ContractBasePanel extends Panel { 

    // Inject the ApplicationFacade 
    @EJB(name="applicationFacade") 
    private ApplicationFacadeLocal applicationFacade; 

    public ContractBasePanel(String id, ApplicationFacadeLocal applicationFacade) { 
     super(id); 
     add(new DefaultDataTable<Contract>("dt_basecontract_list", getColumns(), new ContractProvider(applicationFacade), 10)); 
    } 

    protected List<IColumn<Contract>> getColumns(){ 
     List<IColumn<Contract>> columns = new ArrayList<IColumn<Contract>>(); 
     columns.add(new PropertyColumn<Contract>(new Model<String>("ContractIdentifier"), "contractIdentifier")); 
     columns.add(new PropertyColumn<Contract>(new Model<String>("Assigned To"), "customer.name")); 
     return columns; 
    } 
} 

Inherited Class : ContractModelRootPanel 

// A Panel which displays a DataTable of contract 
public class ContractModelRootPanel extends ContractBasePanel { 

    // Inject the ApplicationFacade 
    @EJB(name="applicationFacade") 
    private ApplicationFacadeLocal applicationFacade; 

    // Represent the Contract Object selected by clicking "detail" or "delete" link 
    private Contract contractSelected; 

    public ContractModelRootPanel(String id, ApplicationFacadeLocal applicationFacade) { 
     super(id, applicationFacade); 
     add(new DefaultDataTable<Contract>("dt_contract_list", getColumns(), new ContractProvider(applicationFacade), 10)); 
    } 

    class ActionPanel extends Panel 
    { 
     public ActionPanel(String id, IModel<Contract> model) 
     { 
      super(id, model); 
      add(new Link("detail") 
      { 
       @Override 
       public void onClick() 
       { 
        // get Contract object which contains only contract identifier 
        contractSelected = (Contract)getParent().getDefaultModelObject(); 
        PageParameters pageParameters = new PageParameters(); 
        pageParameters.add("contractIdentifier", contractSelected.getContractIdentifier()); 

        // handle the displays message if the contract has no owner 
        if(contractSelected.getCustomer() != null) { 
         pageParameters.add("customerName", contractSelected.getCustomer().getName()); 
        } 
        else { 
         pageParameters.add("customerName", "-Not Bound to Any Customer-"); 
        } 
        setResponsePage(ContractDetail.class, pageParameters); 
       } 
      }); 

      add(new Link("delete") 
      { 
       @Override 
       public void onClick() 
       { 
        // get Contract object which contains only contract identifier 
        contractSelected = (Contract)getParent().getDefaultModelObject(); 
        applicationFacade.deleteContract(contractSelected.getContractIdentifier()); 
        RequestCycle rc = RequestCycle.get(); 
        rc.setResponsePage(HomePage.class); 
       } 
      }); 
     } 
    } 

    @Override 
    protected List<IColumn<Contract>> getColumns() { 
     List<IColumn<Contract>> columns = super.getColumns(); 
     // column for "detail" and "delete" link 
     columns.add(new AbstractColumn<Contract>(new Model<String>("Edits")) 
       { 
        public void populateItem(Item<ICellPopulator<Contract>> cellItem, String componentId, 
         IModel<Contract> model) 
        { 
         cellItem.add(new ActionPanel(componentId, model)); 
        } 
       }); 
     return columns; 
    } 
} 

除了檢票ID爲dt_basecontract_list和dt_contract_list以外，兩個類別的HTML都是相同的。

這個錯誤來自哪裏？

Answer 1

下面是一個例子爲您：

BaseDataTable.java：

private DataTable<T> table; 
private SortableDataProvider<T> provider; 

public BaseDataTable(String id, IModel model){ 
super(id, model); 
provider = new ....; 
table = new DataTable<T>("datatable", getColumns(), provider, rowsPerPage); 
add(table); 
} 

protected IColumn<T>[] getColumns(){ 
return new IColumn[]{ 
new PropertyColumn<Account>(new StringResourceModel("id", 
         null), null, "id"), 
new PropertyColumn<Account>(new StringResourceModel("name", 
         null), null, "name"), 
new PropertyColumn<Account>(new StringResourceModel("color", 
         null), null, "color") 
} 
} 

的其它表，延伸BaseDataTable，必須重寫getColumns（）方法和調用super。 getColumns（）在重寫的方法的第一行。

希望我幫了忙！