Question

我有一个对象包含一组另一个对象Roles的用户。我创建了一个新面板ListPanel，用于保存用户角色的列表视图。所有这些都包含在DataTable中。我希望能够过滤掉那个角色列表，这就是我被困住的地方。当我尝试过滤DataTable上的角色时，我收到以下错误：“无法转换值：管理员输入：java.util.Set。无法找到兼容的转换器。”管理员是我从下拉列表中获得的价值。

我迷失了从哪里开始。从我读过的内容来看，你不能使用带有DropDownChoice的转换器，所以我研究了创建一个渲染器，但是传递给渲染器的值是一个String而不是Role对象。我认为渲染器是正确的选择，但有些东西需要在其他地方改变以使其发挥作用。

实体

public class User {
     private String id;
     private String name;
     private Set<Role> roles;
     ......properties/getters/setters.......
}

public class Role {
     private String role;
     private int active;
     ......properties/getters/setters.......
}

搜索面板

public class UserSearchPanel extends BreadCrumbPanel {
    private static final int ROWS_PER_PAGE = 20;

    @Inject
    private UserDao userDao;

    @Inject
    private RoleDao roleDao;    

    private final UserDataTable dataTable;

    public UserSearchPanel( final String id, final IBreadCrumbModel breadCrumbModel ) {
        super( id, breadCrumbModel );
        NotificationPanel feedback = new NotificationPanel( "feedback" );
        feedback.setOutputMarkupId( true );
        add( feedback );

        UserDataProvider dataProvider = new UserDataProvider( userDao );
        dataProvider.setFilterState( loadFilterState() );

        // create the form used to contain all filter components
        final FilterForm<User> form = new FilterForm<User>( "userSearchForm", dataProvider ) {

            @Override
            protected void onSubmit() {
                dataTable.setCurrentPage( 0 );
            }

        };

        dataTable = new UserDataTable( "dataTable", createColumns(), dataProvider, ROWS_PER_PAGE, this );

        dataTable.addTopToolbar( new FilterToolbar( dataTable, form, dataProvider ) );
        form.add( dataTable );
        add( form );
    }

    /**
     * The columns shown on the page.
     */
    private List<IColumn<User, String>> createColumns() {

        List<IColumn<User, String>> columns = new ArrayList<IColumn<User, String>>();
        List<String> choices = new ArrayList<String>();
        try {
            choices = roleDao.getAvailableRoles();
        } catch ( Exception e ) {
            e.printStackTrace();
        }

        if ( choices.size() > 1 ) {
            IModel<List<? extends String>> filterChoices = Model.ofList( choices );
            columns.add( createChoiceColumn( "datatable.roles.label", "roles", "roles", filterChoices ) );
        }
        return columns;
    }

    private ChoiceFilteredPropertyColumn<User, String, String> createChoiceColumn( final String key, final String sortProperty, final String propertyExpression, final IModel<List<? extends String>> filterChoices ) {

        IModel<String> label = getLabel();

        return new ChoiceFilteredPropertyColumn<User, String, String>( label, sortProperty, propertyExpression, filterChoices ) {

            @Override
            protected boolean enableAutoSubmit() {
                return false;
            }

            @Override
            public void populateItem( Item<ICellPopulator<User>> cellItem, String componentId, IModel<User> rowModel ) {
                cellItem.add( new ListPanel( componentId, rowModel ) );
            }
        };
    }

    private class ListPanel extends Panel {

        public ListPanel( String id, IModel<User> model ) {
            super( id );
            User user = (User) model.getObject();
            addList( user );
        }

        private void addList( User user ) {
            Set<Role> rolesSet = user.getRoles();
            List<Role> roles = new ArrayList<>();
            for ( Role role : rolesSet ) {
                roles.add( role );
            }

            ListView<Role> view = new ListView<Role>( "list", roles ) {
                @Override
                protected void populateItem( ListItem<Role> item ) {
                    final Role role = (Role) item.getModelObject();
                    item.add( new Label( "roles", role.getRole() ) );
                }
            };
            add( view );
        }
    }
}

Answer 1

我建议您创建一个类来代表您在User中过滤并对这些值做出反应的内容，而不是使用您的IDataProvider对象。

目前发生的情况是您使用User对象代表您的FilterState并且wicket尝试设置String＆＃34; ADMIN＆＃34;到Set<Role>个User对象的class FilterState implements Serializable { private String roles; public String getRoles() { return roles; } public void setRoles(String roles) { this.roles = roles; } } class UserDataProvider implements IDataProvider<User>, IFilterStateLocator<FilterState> { private FilterState state; private UserDao userDao; public UserDataProvider() { state = new FilterState(); } .... @Override public Iterator<? extends User> iterator(long first, long count) { //just some example filter logic, handled by the dao if (state == null || state.getRoles() == null) { return userDao.getUserList(first, count).iterator(); } else { return userDao.getUserListByRoleName(state.getRoles(), first, count).iterator(); } } @Override public FilterState getFilterState() { return state; } @Override public void setFilterState(FilterState state) { this.state = state; } }。

只需在单独的Object中声明不同的过滤器选项。

像：

Sub SetFilesReadOnly(Optional location As Folder)
    Dim fso As Scripting.FileSystemObject
    Set fso = New Scripting.FileSystemObject

    If location Is Nothing Then
        Set location = fso.GetFolder("C:\Temp")
    End If

    Dim target As File
    For Each target In location.Files
        target.Attributes = target.Attributes + ReadOnly
    Next target

    Dim directory As Folder
    For Each directory In location.SubFolders
        SetFilesReadOnly directory
    Next directory
End Sub

无法过滤Wicket中的下拉列表选项

1 个答案: