我想在我的项目中使用GWT DataGrid widget。我甚至找到了最简单的解决方案here。很遗憾，我收到了一条错误：Lcom_google_gwt_user_client_ui_IsWidget_2_classLit_0_g$ is not defined。我注意到只有当我有这行代码时才会出现这种情况：dataGrid.add(table);其中 dataGrid 变量为：
@UiField
SimplePanel dataGrid;
和表变量是：
DataGrid<Address> table = new DataGrid<Address>();
以下是来自网络浏览器控制台（Google Chrome）的完整堆栈跟踪：
Tue Mar 15 08:54:41 GMT+100 2016 com.google.gwt.logging.client.LogConfiguration
SEVERE: Exception caught: Exception caught: Exception caught: Exception caught: (ReferenceError) : Lcom_google_gwt_user_client_ui_IsWidget_2_classLit_0_g$ is not definedcom.google.gwt.user.client.ui.AttachDetachException: Exception caught: Exception caught: Exception caught: Exception caught: (ReferenceError) : Lcom_google_gwt_user_client_ui_IsWidget_2_classLit_0_g$ is not defined
at Unknown.fillInStackTrace_0_g$(cms-0.js@3:8683)
at Unknown.Throwable_3_g$(cms-0.js@8:8638)
at Unknown.Exception_3_g$(cms-0.js@18:8781)
at Unknown.RuntimeException_3_g$(cms-0.js@18:8822)
at Unknown.UmbrellaException_3_g$(cms-0.js@25:36781)
at Unknown.UmbrellaException_5_g$(cms-0.js@26:36842)
at Unknown.AttachDetachException_1_g$(cms-0.js@26:62116)
at Unknown.tryCommand_1_g$(cms-0.js@11:62172)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.setParent_2_g$(cms-0.js@12:53295)
at Unknown.adopt_0_g$(cms-0.js@14:61679)
at Unknown.add_14_g$(cms-0.js@8:61737)
at Unknown.add_13_g$(cms-0.js@8:61730)
at Unknown.add_66_g$(cms-0.js@8:89357)
at Unknown.add_11_g$(cms-0.js@8:61667)
at Unknown.add_65_g$(cms-0.js@43:89353)
at Unknown.setPanelContent_0_g$(cms-0.js@54:127158)
at Unknown.setInSlot_7_g$(cms-0.js@25:119945)
at Unknown.setInSlot_1_g$(cms-0.js@25:85174)
at Unknown.setInSlot_0_g$(cms-0.js@8:85163)
at Unknown.execute_27_g$(cms-0.js@30:88416)
at Unknown.$executeScheduled_0_g$(cms-0.js@40:11900)
at Unknown.runScheduledTasks_0_g$(cms-0.js@9:11622)
at Unknown.flushPostEventPumpCommands_0_g$(cms-0.js@5:11714)
at Unknown.execute_5_g$(cms-0.js@22:11853)
at Unknown.execute_4_g$(cms-0.js@19:11590)
at Unknown.apply_0_g$(cms-0.js@28:11085)
at Unknown.entry0_0_g$(cms-0.js@16:11141)
at Unknown.anonymous(cms-0.js@14:11121)
at Unknown.callback_0_g$(cms-0.js@45:11641)
Caused by: com.google.gwt.user.client.ui.AttachDetachException: Exception caught: Exception caught: Exception caught: (ReferenceError) : Lcom_google_gwt_user_client_ui_IsWidget_2_classLit_0_g$ is not defined
at Unknown.fillInStackTrace_0_g$(cms-0.js@3:8683)
at Unknown.Throwable_3_g$(cms-0.js@8:8638)
at Unknown.Exception_3_g$(cms-0.js@18:8781)
at Unknown.RuntimeException_3_g$(cms-0.js@18:8822)
at Unknown.UmbrellaException_3_g$(cms-0.js@25:36781)
at Unknown.UmbrellaException_5_g$(cms-0.js@26:36842)
at Unknown.AttachDetachException_1_g$(cms-0.js@26:62116)
at Unknown.tryCommand_1_g$(cms-0.js@11:62172)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.execute_9_g$(cms-0.js@10:62200)
at Unknown.tryCommand_1_g$(cms-0.js@14:62156)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.setParent_2_g$(cms-0.js@12:53295)
at Unknown.adopt_0_g$(cms-0.js@14:61679)
at Unknown.add_14_g$(cms-0.js@8:61737)
at Unknown.add_13_g$(cms-0.js@8:61730)
at Unknown.add_66_g$(cms-0.js@8:89357)
at Unknown.add_11_g$(cms-0.js@8:61667)
at Unknown.add_65_g$(cms-0.js@43:89353)
at Unknown.setPanelContent_0_g$(cms-0.js@54:127158)
at Unknown.setInSlot_7_g$(cms-0.js@25:119945)
at Unknown.setInSlot_1_g$(cms-0.js@25:85174)
at Unknown.setInSlot_0_g$(cms-0.js@8:85163)
at Unknown.execute_27_g$(cms-0.js@30:88416)
at Unknown.$executeScheduled_0_g$(cms-0.js@40:11900)
at Unknown.runScheduledTasks_0_g$(cms-0.js@9:11622)
at Unknown.flushPostEventPumpCommands_0_g$(cms-0.js@5:11714)
at Unknown.execute_5_g$(cms-0.js@22:11853)
at Unknown.execute_4_g$(cms-0.js@19:11590)
at Unknown.apply_0_g$(cms-0.js@28:11085)
at Unknown.entry0_0_g$(cms-0.js@16:11141)
at Unknown.anonymous(cms-0.js@14:11121)
at Unknown.callback_0_g$(cms-0.js@45:11641)
Caused by: com.google.gwt.user.client.ui.AttachDetachException: Exception caught: Exception caught: (ReferenceError) : Lcom_google_gwt_user_client_ui_IsWidget_2_classLit_0_g$ is not defined
at Unknown.fillInStackTrace_0_g$(cms-0.js@3:8683)
at Unknown.Throwable_3_g$(cms-0.js@8:8638)
at Unknown.Exception_3_g$(cms-0.js@18:8781)
at Unknown.RuntimeException_3_g$(cms-0.js@18:8822)
at Unknown.UmbrellaException_3_g$(cms-0.js@25:36781)
at Unknown.UmbrellaException_5_g$(cms-0.js@26:36842)
at Unknown.AttachDetachException_1_g$(cms-0.js@26:62116)
at Unknown.tryCommand_1_g$(cms-0.js@11:62172)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.execute_9_g$(cms-0.js@10:62200)
at Unknown.tryCommand_1_g$(cms-0.js@14:62156)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.execute_9_g$(cms-0.js@10:62200)
at Unknown.tryCommand_1_g$(cms-0.js@14:62156)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.setParent_2_g$(cms-0.js@12:53295)
at Unknown.adopt_0_g$(cms-0.js@14:61679)
at Unknown.add_14_g$(cms-0.js@8:61737)
at Unknown.add_13_g$(cms-0.js@8:61730)
at Unknown.add_66_g$(cms-0.js@8:89357)
at Unknown.add_11_g$(cms-0.js@8:61667)
at Unknown.add_65_g$(cms-0.js@43:89353)
at Unknown.setPanelContent_0_g$(cms-0.js@54:127158)
at Unknown.setInSlot_7_g$(cms-0.js@25:119945)
at Unknown.setInSlot_1_g$(cms-0.js@25:85174)
at Unknown.setInSlot_0_g$(cms-0.js@8:85163)
at Unknown.execute_27_g$(cms-0.js@30:88416)
at Unknown.$executeScheduled_0_g$(cms-0.js@40:11900)
at Unknown.runScheduledTasks_0_g$(cms-0.js@9:11622)
at Unknown.flushPostEventPumpCommands_0_g$(cms-0.js@5:11714)
at Unknown.execute_5_g$(cms-0.js@22:11853)
at Unknown.execute_4_g$(cms-0.js@19:11590)
at Unknown.apply_0_g$(cms-0.js@28:11085)
at Unknown.entry0_0_g$(cms-0.js@16:11141)
at Unknown.anonymous(cms-0.js@14:11121)
at Unknown.callback_0_g$(cms-0.js@45:11641)
Caused by: com.google.gwt.user.client.ui.AttachDetachException: Exception caught: (ReferenceError) : Lcom_google_gwt_user_client_ui_IsWidget_2_classLit_0_g$ is not defined
at Unknown.fillInStackTrace_0_g$(cms-0.js@3:8683)
at Unknown.Throwable_3_g$(cms-0.js@8:8638)
at Unknown.Exception_3_g$(cms-0.js@18:8781)
at Unknown.RuntimeException_3_g$(cms-0.js@18:8822)
at Unknown.UmbrellaException_3_g$(cms-0.js@25:36781)
at Unknown.UmbrellaException_5_g$(cms-0.js@26:36842)
at Unknown.AttachDetachException_1_g$(cms-0.js@26:62116)
at Unknown.tryCommand_1_g$(cms-0.js@11:62172)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.onAttach_14_g$(cms-0.js@46:67161)
at Unknown.onAttach_4_g$(cms-0.js@20:53405)
at Unknown.execute_9_g$(cms-0.js@10:62200)
at Unknown.tryCommand_1_g$(cms-0.js@14:62156)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.execute_9_g$(cms-0.js@10:62200)
at Unknown.tryCommand_1_g$(cms-0.js@14:62156)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.execute_9_g$(cms-0.js@10:62200)
at Unknown.tryCommand_1_g$(cms-0.js@14:62156)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.setParent_2_g$(cms-0.js@12:53295)
at Unknown.adopt_0_g$(cms-0.js@14:61679)
at Unknown.add_14_g$(cms-0.js@8:61737)
at Unknown.add_13_g$(cms-0.js@8:61730)
at Unknown.add_66_g$(cms-0.js@8:89357)
at Unknown.add_11_g$(cms-0.js@8:61667)
at Unknown.add_65_g$(cms-0.js@43:89353)
at Unknown.setPanelContent_0_g$(cms-0.js@54:127158)
at Unknown.setInSlot_7_g$(cms-0.js@25:119945)
at Unknown.setInSlot_1_g$(cms-0.js@25:85174)
at Unknown.setInSlot_0_g$(cms-0.js@8:85163)
at Unknown.execute_27_g$(cms-0.js@30:88416)
at Unknown.$executeScheduled_0_g$(cms-0.js@40:11900)
at Unknown.runScheduledTasks_0_g$(cms-0.js@9:11622)
at Unknown.flushPostEventPumpCommands_0_g$(cms-0.js@5:11714)
at Unknown.execute_5_g$(cms-0.js@22:11853)
at Unknown.execute_4_g$(cms-0.js@19:11590)
at Unknown.apply_0_g$(cms-0.js@28:11085)
at Unknown.entry0_0_g$(cms-0.js@16:11141)
at Unknown.anonymous(cms-0.js@14:11121)
at Unknown.callback_0_g$(cms-0.js@45:11641)
Caused by: com.google.gwt.core.client.JavaScriptException: (ReferenceError) : Lcom_google_gwt_user_client_ui_IsWidget_2_classLit_0_g$ is not defined
at Unknown.doAttachChildren_5_g$(cms-0.js@125:63399)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.onAttach_12_g$(cms-0.js@46:63237)
at Unknown.onAttach_13_g$(cms-0.js@46:63523)
at Unknown.execute_9_g$(cms-0.js@10:62200)
at Unknown.tryCommand_1_g$(cms-0.js@14:62156)
at Unknown.doAttachChildren_1_g$(cms-0.js@3:61692)
at Unknown.onAttach_2_g$(cms-0.js@8:53199)
at Unknown.onAttach_14_g$(cms-0.js@46:67161)
at Unknown.onAttach_4_g$(cms-0.js@20:53405)
这是视图类：
import java.util.Arrays;
import java.util.List;
import com.google.gwt.core.client.GWT;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.cellview.client.DataGrid;
import com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy.KeyboardSelectionPolicy;
import com.google.gwt.user.cellview.client.TextColumn;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.view.client.SelectionChangeEvent;
import com.google.gwt.view.client.SingleSelectionModel;
import com.gwtplatform.mvp.client.ViewWithUiHandlers;
public class FilesView extends ViewWithUiHandlers<FilesUiHandlers> implements FilesPresenter.MyView {
interface Binder extends UiBinder<Widget, FilesView> {
}
private static FilesViewUiBinder uiBinder = GWT.create(FilesViewUiBinder.class);
interface FilesViewUiBinder extends UiBinder<Widget, FilesView> {
}
@UiField
SimplePanel dataGrid;
public FilesView() {
initWidget(uiBinder.createAndBindUi(this));
loadTable();
}
/**
* A simple data type that represents an Address.
*/
private static class Address {
private final String houseNumber;
private final String streetName;
private final String county;
private final String postCode;
private final String country;
public Address(String houseNumber, String streetName, String county, String postCode, String country) {
this.houseNumber = houseNumber;
this.streetName = streetName;
this.county = county;
this.postCode = postCode;
this.country = country;
}
}
/*
* The list of data to display.
*/
private static final List<Address> ADDRESS = Arrays.asList(new Address("123", "Lloyds Road", "Middlesex", "TE0 6NB", "United Kingdom"), new Address("456", "Oxford Street", "Oxford", "LK9 0CV",
"United Kingdom"));
public void loadTable() {
DataGrid<Address> table = new DataGrid<Address>();
table.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);
TextColumn<Address> houseNumber = new TextColumn<Address>() {
@Override
public String getValue(Address object) {
return object.houseNumber;
}
};
table.addColumn(houseNumber, "House Number");
TextColumn<Address> streetName = new TextColumn<Address>() {
@Override
public String getValue(Address object) {
return object.streetName;
}
};
table.addColumn(streetName, "Street Name");
TextColumn<Address> county = new TextColumn<Address>() {
@Override
public String getValue(Address object) {
return object.county;
}
};
table.addColumn(county, "County");
TextColumn<Address> postCode = new TextColumn<Address>() {
@Override
public String getValue(Address object) {
return object.postCode;
}
};
table.addColumn(postCode, "Post Code");
TextColumn<Address> country = new TextColumn<Address>() {
@Override
public String getValue(Address object) {
return object.country;
}
};
table.addColumn(country, "Country");
// Add a selection model to handle user selection.
final SingleSelectionModel<Address> selectionModel = new SingleSelectionModel<Address>();
table.setSelectionModel(selectionModel);
selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
@Override
public void onSelectionChange(SelectionChangeEvent event) {
Address selected = selectionModel.getSelectedObject();
if (selected != null) {
Window.alert("You selected: " + selected.houseNumber + " " + selected.streetName + " " + selected.county + " " + selected.postCode + " " + selected.country);
}
}
});
table.setRowCount(ADDRESS.size(), true);
table.setRowData(0, ADDRESS);
table.setWidth("100%");
// SimpleLayoutPanel slp = new SimpleLayoutPanel();
dataGrid.add(table);
// Add it to the root panel.
// RootLayoutPanel.get().add(slp);
}
}
和视图绑定视图类：
<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
xmlns:g="urn:import:com.google.gwt.user.client.ui" xmlns:m="urn:import:gwt.material.design.client.ui"
>
<m:MaterialRow>
<g:HTMLPanel>
<h2>Your files</h2>
<g:SimplePanel ui:field="dataGrid" />
</g:HTMLPanel>
</m:MaterialRow>
</ui:UiBinder>
演示者不要做任何特别的事情。
我使用GWT 2.7
请帮忙。
答案 0 :(得分：0)
这很奇怪，但它应该是：