Question

我尝试在DataGrid中显示数据，但它不起作用。

以下是我的代码片段：

public DataGridAffiche2() {        
    super(true);

    AbsolutePanel absolutePanel = new AbsolutePanel();
    setWidget(absolutePanel);
    absolutePanel.setSize("1002px", "404px");
    Label lblJaiAjoutAu = new Label("j'ai ajoutÃ© au dessous de cette ligne");
    absolutePanel.add(lblJaiAjoutAu, 10, 20);
    System.out.println("ttt");
    final DataGrid<Employe> grid=new DataGrid<Employe>();
    System.out.println("ttt1");
    final List<Employe> values=new ArrayList<Employe>();

    System.out.println("ttt2");

    Employe p=new Employe();
    System.out.println("ttt3");    

    rpc.afficheEmploye(new AsyncCallback<List<Employe>>() {
        @Override
        public void onSuccess(List<Employe> result) {
            System.out.println("ttt4");
            List<Employe> values=new ArrayList<Employe>();
            System.out.println("ttt5");
            System.out.println("datagridaffich2 avant values");
            System.out.print(values);
            System.out.println("ttt6");

            for(Employe p:result ){
                System.out.println("ttt7");
                values.add(p);
                System.out.println("values hadek est "+p);
                System.out.println("firstName du client est ");
                System.out.println("firstName du client est "+values);
                System.out.println("hada howa p "+result);
            }                  
        }

        @Override
        public void onFailure(Throwable caught) {
            System.out.println("ttt8");
        }
    });

    System.out.println("ttt9");
    grid.setAutoHeaderRefreshDisabled(true);
    grid.setAutoFooterRefreshDisabled(true);
    ListHandler<Employe> sortHandler = new ListHandler<Employe>(values);
    grid.addColumnSortHandler(sortHandler);
    grid.setRowData(values);
    grid.setVisible(true);
    grid.setSize("839px", "323px");

    grid.setEmptyTableWidget(new Label("Message afficher test"));
    System.out.println("ttt10");
    Column<Employe, String> nameColumn = new Column<Employe, String>(new EditTextCell()) {
        @Override
        public String getValue(Employe object) {
            return object.getFirstname();
        }
    };

    abstract class PendingChange<T> {
        private final Employe Employe;
        private final T value;

        public PendingChange(Employe Employe, T value) {
            this.Employe = Employe;
            this.value = value;
        }

        public void commit() {
            doCommit(Employe, value);
        }

        protected abstract void doCommit(Employe Employe, T value);
    }


    final String[] FirstNameData = new String[] {
        "Hollie", "Emerson", "Healy", "Brigitte", "Elba", "Claudio",
        "Dena", "Christina", "Gail", "Orville", "Rae", "Mildred",
        "Candice", "Louise", "Emilio", "Geneva", "Heriberto", "Bulrush", 
        "Abigail", "Chad", "Terry", "Bell"
    };

    class BirthdayChange extends PendingChange<Date> {
        public BirthdayChange(Employe Employe, Date value) {
            super(Employe, value);
        }

        protected void doCommit(Employe Employe, Date value) {
            Employe e=new Employe();
            e.setDate_nais(value);
        }
    }

    Column<Employe, Date> datepeckercolumn1 = new Column<Employe, Date>(new DatePickerCell()) {
        @Override
        public Date getValue(Employe object) {
            return object.getDate_nais();
        }
    };

    datepeckercolumn1.setSortable(true);
    grid.addColumn(datepeckercolumn1, "datepeckerDJ");

    List<Employe> items = grid.getVisibleItems();
    if (items.size() != 0) {
        int totalAge = 0;
        for (Employe item : items) {
            totalAge ++;
        }
        countnom="nombre d'Employe : " + totalAge;
    }
    grid.addColumn(nameColumn,"Nom",countnom);

    Column<Employe, String> prenomColumn = new Column<Employe, String>(new EditTextCell()) {
        @Override
        public String getValue(Employe object) {
            return object.getLastname();
        }
    };

    prenomColumn.setSortable(true);
    sortHandler.setComparator(prenomColumn, new Comparator<Employe>() {
        @Override
        public int compare(Employe o1, Employe o2) {
            return o1.getLastname().compareTo(o2.getLastname());
        }
    });

    grid.addColumn(prenomColumn,"Prenom");
    Column<Employe, String> adresseColumn = new Column<Employe, String>(new EditTextCell()) {
        @Override
        public String getValue(Employe object) {
            return object.getEmailaddress();
        }
    };        

    grid.addColumn(adresseColumn,"Adresse");

    absolutePanel.add(grid, 10, 50);

    Column<Employe, Date> datepeckercolumn = new Column<Employe, Date>(new DatePickerCell()) {
        @Override
        public Date getValue(Employe object) {
            return (Date) null;
        }
    };

    datepeckercolumn.setSortable(true);
    grid.addColumn(datepeckercolumn, "datepeckerDJ");

    Column<Employe, String> btn = new Column<Employe, String>(new ButtonCell()) {
        @Override
        public String getValue(Employe object) {
            return (String) null;
        }
    };


    grid.addColumn(btn, "Buttun");

    ListBox lb = new ListBox();
    lb.addItem("foo");
    lb.addItem("bar");
    lb.addItem("baz");
    lb.addItem("toto");
    lb.addItem("tintin");


    lb.setVisibleItemCount(5);
    Column<Employe, String> Combobox = new Column<Employe, String >(new SelectionCell(new ArrayList<String>())) {
        @Override
        public String getValue(Employe object) {
            return (String) null;
        }
    };

    grid.addColumn(Combobox, "ComboBox");

    Button btnQuiter = new Button("Quiter");
    btnQuiter.addClickHandler(new ClickHandler() {
        public void onClick(ClickEvent event) {
            DataGridAffiche2.this.hide();
        }
    });

    CellBrowser cellBrowser = new CellBrowser(
        new TreeViewModel() {
            final AbstractDataProvider<String> dataProvider = new ListDataProvider<String>();
            final AbstractSelectionModel<String> selectionModel = new NoSelectionModel<String>();
            @Override
            public <T> NodeInfo<?> getNodeInfo(T value) {
                return new DefaultNodeInfo<String>(dataProvider, new TextCell(), selectionModel, null);
            }
            @Override
            public boolean isLeaf(Object value) {
                return true;
            }
        }, null);
    absolutePanel.add(cellBrowser);
    absolutePanel.add(btnQuiter, 919, 316);

    Button btnAfficheDatagrid = new Button("Affiche datagrid");
    btnAfficheDatagrid.addClickHandler(new ClickHandler() {
        public void onClick(ClickEvent event) {

        }
    });
    absolutePanel.add(btnAfficheDatagrid, 863, 267);
}

public List<Employe> afficheEmploye() {
    DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();

    List<Employe> lp = new ArrayList<Employe>();

    Query q = new Query("Employe");

    List<Entity> results = datastore.prepare(q).asList(FetchOptions.Builder.withDefaults());
    for(Entity employe :results ){
        Employe p = new Employe();
        datastore.put(employe);
        PreparedQuery pq = datastore.prepare(q);

        for (Entity result : pq.asIterable()) {
            String firstName = (String) result.getProperty("firstName");
            String lastName = (String) result.getProperty("lastName");
            System.out.println(firstName + " " + lastName + ",  inches tall  jdid");
        }
        lp.add(p);
    }
    return lp;
}

Answer 1

在您的rpc调用的成功方法中，您正在创建新的本地列表并将数据添加到名为值的本地列表中，该列表永远不会传递到您的数据网格。

这有两个解决方案

1）使用

 dataGrid.setRowData(values); 
 dataGrid.redraw();

成功方法。

2）或使用ListDataProvider。

gwt datagrid数据存储区，未查看datagrid

1 个答案: