我正在使用这个课程：
/**
*
*/
package com.xerox.tclg.ejuror.ui.client;
import com.extjs.gxt.ui.client.Style.HorizontalAlignment;
import com.extjs.gxt.ui.client.event.ButtonEvent;
import com.extjs.gxt.ui.client.event.Events;
import com.extjs.gxt.ui.client.event.FormEvent;
import com.extjs.gxt.ui.client.event.Listener;
import com.extjs.gxt.ui.client.event.SelectionListener;
import com.extjs.gxt.ui.client.widget.LayoutContainer;
import com.extjs.gxt.ui.client.widget.MessageBox;
import com.extjs.gxt.ui.client.widget.button.Button;
import com.extjs.gxt.ui.client.widget.button.ButtonBar;
import com.extjs.gxt.ui.client.widget.form.FileUploadField;
import com.extjs.gxt.ui.client.widget.form.FormPanel;
import com.extjs.gxt.ui.client.widget.form.FormPanel.Encoding;
import com.extjs.gxt.ui.client.widget.form.FormPanel.Method;
import com.extjs.gxt.ui.client.widget.form.LabelField;
import com.extjs.gxt.ui.client.widget.form.TextField;
import com.extjs.gxt.ui.client.widget.layout.TableData;
import com.extjs.gxt.ui.client.widget.layout.TableLayout;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Image;
import com.xerox.tclg.ejuror.ui.client.service.PersonViewService;
import com.xerox.tclg.ejuror.ui.client.service.PersonViewServiceAsync;
import com.xerox.tclg.ejuror.ui.client.workbench.StyleHelper;
/**
* Form for uploading images to the main server
* @author Xerox Services
*/
public class UploadForm extends MessageEnabledContainer {
//instance variables
private String description;
private String cancel;
private String file;
private MessageResource messageResource;
private String ok;
private PersonViewServiceAsync personViewService = (PersonViewServiceAsync) GWT.create(PersonViewService.class);
//UI components
private Button btnOk;
private Button btnCancel;
private ButtonBar buttonBar;
private LabelField lblTitle;
private FormPanel form;
private LayoutContainer header;
private LayoutContainer layMain;
private TextField<String> textDescription;
private FileUploadField uploadFile;
/**
* Create a disclaimer page that will show disclaimers and return the results in a callback
* @param icon
* @param header1
* @param header2
* @param disclaimerText
* @param buttonFlags
*/
public UploadForm() {
String selectFile;
String title;
messageResource = ImageViewer.getImageViewer();
if(isDesignTime()){
cancel = "Cancel";
description = "Short Description<BR/>(e.g. Doctor's Letter)";
file = "File";
ok = "Ok";
selectFile = "Select a File to Upload";
title = "Upload a File";
}
else{
cancel = messageResource.getString(Messages.MSGKEY_CANCEL);
description = "Short Description<BR/>(e.g. Doctor's Letter)";
file = "File";
ok = messageResource.getString(Messages.MSGKEY_OK);
selectFile = "Select a File to Upload";
title = "Upload a File";
}
addStyleName("white-screen");
setWidth(MainLayout.FORM_WIDTH);
setLayout(new TableLayout());
header = new LayoutContainer();
TableLayout tl_header = new TableLayout(2);
tl_header.setCellSpacing(5);
header.setLayout(tl_header);
Image imageUpload = new Image(EjurorBundle.BUNDLE.uploadIcon());
header.add(imageUpload);
String str = StyleHelper.formatHeader(title);
lblTitle = new LabelField(str);
header.add(lblTitle);
layMain = new LayoutContainer();
TableLayout tl_layMain = new TableLayout();
tl_layMain.setCellPadding(5);
layMain.setLayout(tl_layMain);
layMain.add(header);
form = new FormPanel();
form.setHeading(selectFile);
layMain.add(form);
buildUploadForm();
buildButtonBar();
FooterContainer footer = new FooterContainer("50");
TableData td_footer = new TableData();
td_footer.setWidth("100%");
layMain.add(footer, td_footer);
footer.setSize("740", "");
add(layMain);
loadUrl();
}
/**
*
*/
private void buildButtonBar() {
// buttonBar = new ButtonBar();
// buttonBar.setAlignment(HorizontalAlignment.RIGHT);
// buttonBar.setHeight(MainLayout.BUTTON_BAR_HEIGHT);
// form.add(buttonBar);
btnOk = new Button(ok);
btnOk.setSize(MainLayout.BUTTON_WIDTH, MainLayout.BUTTON_HEIGHT);
btnOk.addSelectionListener(new SelectionListener<ButtonEvent>() {
@Override
public void componentSelected(ButtonEvent be) {
if(form.isValid()){
upload();
}
else{
MessageBox.info("Validation Error", "You must enter all required fields.", null);
}
}
});
// buttonBar.add(btnOk);
form.add(btnOk);
btnCancel = new Button(cancel);
btnCancel.setSize(MainLayout.BUTTON_WIDTH, MainLayout.BUTTON_HEIGHT);
btnCancel.addSelectionListener(new SelectionListener<ButtonEvent>() {
@Override
public void componentSelected(ButtonEvent be) {
exit();
}
});
// buttonBar.add(btnCancel);
form.add(btnCancel);
}
/**
*
*/
private void buildUploadForm() {
form.setFrame(true);
form.setEncoding(Encoding.MULTIPART);
form.setMethod(Method.POST);
form.setButtonAlign(HorizontalAlignment.CENTER);
form.setWidth(MainLayout.CONTENT_WIDTH);
form.addListener(Events.Submit, new Listener<FormEvent>() {
public void handleEvent(FormEvent fe) {
System.out.println(fe.getResultHtml());
};
});
String desc = StyleHelper.formatPrompt(description);
textDescription = new TextField<String>();
textDescription.setAllowBlank(false);
textDescription.setFieldLabel(desc);
form.add(textDescription);
String fileLabel = StyleHelper.formatPrompt(file);
uploadFile = new FileUploadField();
uploadFile.setAllowBlank(false);
uploadFile.setFieldLabel(fileLabel);
form.add(uploadFile);
}
/**
* Jump back to the landing page
*/
protected void exit(){
ImageViewer.getImageViewer().showLanding();
}
/**
*
*/
protected void upload(){
form.submit();
exit();
}
/**
* Load the URL from the person service
*/
private void loadUrl() {
personViewService.buildUploadUrl(new AsyncCallback<String>() {
@Override
public void onFailure(Throwable caught) {
System.err.println("Unable to construct URL");
caught.printStackTrace();
MainLayout.showError(caught.getMessage());
}
@Override
public void onSuccess(String url) {
form.setAction(url);
}
});
}
/**
* GWT-Designer will change to return true during design time
*
* @return
*/
private static final boolean isDesignTime() {
return false;
}
}
如您所见，URL是动态构建的。
问题是当我运行它并单击OK按钮时，servlet永远不会被调用。如果我查看呈现的HTML并复制操作中的URL，然后将其粘贴到我的浏览器中，它会调用servlet，因此URL正常。
我还确认正在调用提交。
有人能指出我正确的方向吗？我正在关注这个例子：
答案 0 :(得分：0)
尝试这个（或调试它）并查看是否曾调用过上传。也许你的表格无效：
//if(form.isValid()){
upload();
// }
答案 1 :(得分：0)
我认为问题是由于我在提交内容完成之前隐藏表单引起的。很难说，因为我从一个我认识的例子开始，这是一个对话，所以我重新开始并一次改变一两件事并进行测试。
因此，更改为对话框可能是其中的一部分，但如果我在提交FormPanel后立即隐藏表单，它肯定无效。我添加以下代码等待四分之一秒，它解决了问题。
Scheduler.get().scheduleFixedDelay(new RepeatingCommand() {
@Override
public boolean execute() {
hide(selectedButton);
return false;
}
}, 250);