Java 数据提供程序修改后冻结了带有SimplePage的GWT数据表
在GWT2.7.0中,Java 数据提供程序修改后冻结了带有SimplePage的GWT数据表,java,gwt,datatable,dataprovider,simplepager,Java,Gwt,Datatable,Dataprovider,Simplepager,在GWT2.7.0中,DataTable的simplepage有一个奇怪的问题 我以这种方式在视图中创建了一个DataTable: private void initCellTable() { pecMessageCellTable = new CellTable<>(); dataProvider = new ListDataProvider<>(); dataProvider.addDataDisplay(pecMessageCell
DataTable
的simplepage
有一个奇怪的问题
我以这种方式在视图中创建了一个DataTable
:
private void initCellTable() {
pecMessageCellTable = new CellTable<>();
dataProvider = new ListDataProvider<>();
dataProvider.addDataDisplay(pecMessageCellTable);
pecMessageCellTable.setPageSize(DEFAULT_PAGE_SIZE);
pecMessageCellTable.setVisibleRange(0,DEFAULT_PAGE_SIZE);
pecMessageCellTable.setWidth("100%", true);
pecMessageCellTable.setAutoHeaderRefreshDisabled(true);
pecMessageCellTable.setAutoFooterRefreshDisabled(true);
pecMessageCellTable.setEmptyTableWidget(new NoResults());
//sort handler
ColumnSortEvent.ListHandler<PecMessage> sortHandler = new ColumnSortEvent.ListHandler<>(dataProvider.getList());
pecMessageCellTable.addColumnSortHandler(sortHandler);
SimplePager.Resources pagerResources = GWT.create(SimplePager.Resources.class);
pager = new SimplePager(SimplePager.TextLocation.CENTER, pagerResources, false, 0, true);
pager.setDisplay(pecMessageCellTable);
pager.setVisible(false);
//from
TextColumn<PecMessage> fromColumn = new TextColumn<PecMessage>() {
@Override
public String getValue(PecMessage message) {
return message.getFrom().iterator().next();
}
};
fromColumn.setSortable(true);
pecMessageCellTable.addColumn(fromColumn, "Mittente");
pecMessageCellTable.setColumnWidth(fromColumn, 18, Unit.PCT);
//subject
TextColumn<PecMessage> subjColumn = new TextColumn<PecMessage>() {
@Override
public String getValue(PecMessage message) {
return message.getSubject();
}
};
subjColumn.setSortable(true);
pecMessageCellTable.addColumn(subjColumn, "Oggetto");
//received date
TextColumn<PecMessage> sentDateColumn = new TextColumn<PecMessage>() {
@Override
public String getValue(PecMessage message) {
return DateTimeFormat.getFormat("dd/MM/yy hh:mm:ss").format(message.getReceived());
}
};
sentDateColumn.setSortable(true);
pecMessageCellTable.addColumn(sentDateColumn, "Data Ricezione");
pecMessageCellTable.setColumnWidth(sentDateColumn, 12, Unit.PCT);
ImageCell imageCell=new ImageCell();
Column<PecMessage,String> iconColumn = new Column<PecMessage, String>(imageCell){
@Override
public String getValue(PecMessage object) {
return object.getImageUrl(object);
}
};
pecMessageCellTable.addColumn(iconColumn,"Lock");
pecMessageCellTable.setColumnWidth(iconColumn, 46, Unit.PX);
//delete Message
ButtonCell buttonCell = new ButtonCell(ButtonType.DANGER, IconType.TRASH);
Column<PecMessage, String> deleteBtn = new Column<PecMessage, String>(buttonCell) {
@Override
public String getValue(PecMessage object) {
return "Elimina";
}
};
pecMessageCellTable.addColumn(deleteBtn, "Elimina");
pecMessageCellTable.setColumnWidth(deleteBtn, 9, Unit.PCT);
pecMessageCellTable.setVisible(false);
}
public void updateLock(PecMessage message){
int i=dataProvider.getList().indexOf(message);
message.setLockedState(0);
dataProvider.getList().set(i, message);
dataProvider.flush();
dataProvider.refresh();
}
当用户触发事件并修改数据表的某些元素时,我总是调用dataProvider.flush()
和dataProvider.refresh()
,但有时,数据表分页似乎不再有效,SimplePage会更改其范围值,但不会更改表页,表格已冻结,用户无法再更改页面。
它是随机发生的,所以很难修复
对这种奇怪的行为有什么建议吗
更新1:
我意识到错误应该在
setEmails()
方法中,因为只有在我完全修改dataProvider
中的列表时才会出现问题,希望这可以限制调查范围。我已经解决了问题。
我对浏览器控制台进行了更好的分析,发现了一个与java类相关的特定错误:
Mon Feb 13 14:59:29 GMT+100 2017 com.google.gwt.logging.client.LogConfiguration
SEVERE: (TypeError) : Cannot read property 'eQ' of nullcom.google.gwt.core.client.JavaScriptException: (TypeError) : Cannot read property 'eQ' of null
at Unknown.ER(Exceptions.java:36)
at Unknown.Nk(PecMessage.java:322)
at Unknown.X(Object.java:66)
at Unknown.VY(HasDataPresenter.java:1017)
at Unknown.aZ(HasDataPresenter.java:1139)
at Unknown.qZ(HasDataPresenter.java:984)
at Unknown.jt(SchedulerImpl.java:185)
at Unknown._s(SchedulerImpl.java:279)
at Unknown.Qs(Impl.java:323)
at Unknown.Ps(Impl.java:314)
at Unknown.anonymous(Impl.java:72)
在PecMessage.java:322
中,我发现equals()
方法不是最新的,不能控制空值。一些新属性被添加到对象中,其他属性也被修改,所以我更新了equals()
和hashCode()
方法,现在CellTable
似乎工作正常
Mon Feb 13 14:59:29 GMT+100 2017 com.google.gwt.logging.client.LogConfiguration
SEVERE: (TypeError) : Cannot read property 'eQ' of nullcom.google.gwt.core.client.JavaScriptException: (TypeError) : Cannot read property 'eQ' of null
at Unknown.ER(Exceptions.java:36)
at Unknown.Nk(PecMessage.java:322)
at Unknown.X(Object.java:66)
at Unknown.VY(HasDataPresenter.java:1017)
at Unknown.aZ(HasDataPresenter.java:1139)
at Unknown.qZ(HasDataPresenter.java:984)
at Unknown.jt(SchedulerImpl.java:185)
at Unknown._s(SchedulerImpl.java:279)
at Unknown.Qs(Impl.java:323)
at Unknown.Ps(Impl.java:314)
at Unknown.anonymous(Impl.java:72)