有没有办法将SingleUploader添加到DynamicForm对象? 我使用dynamicFormObj.setField()添加了一些小部件(Radiobutton,TextBox等)。我想将SingleUploader对象与我使用setField添加的小部件一起添加到dynamicFormObj。如果有任何解决方案,请告诉我。 注意:SingleUploader允许我们异步上传文件到服务器。这就是我无法使用UploadItem的原因。如果有任何替代解决方案使用DynamicForm上传文件也会被邀请。
答案 0 :(得分:0)
我建议你看看FileItem。此外,不是在构造之后尝试将其添加到表单中,而是在开头添加它,然后在要显示或不显示时显示/隐藏。显示/隐藏的另一个建议是使用showIfFunction。
答案 1 :(得分:0)
我有一个解决方案,通过使用隐藏的Gwt小部件将上传逻辑绑定到IButton。
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler;
import com.smartgwt.client.util.ValueCallback;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
/**
* The FileUploadButton widget class is a class that implements the same APIs as the
* {@link com.smartgwt.client.widgets.IButton} class. Once the button is clicked, a "Open" dialog will be shown. After a
* file is selected, the file content will be uploaded to the destination. The response will be shown, if a callback
* function is assigned.
*
* Depending on the current skin, <code>IButton</code>s may be on the
* {@link com.smartgwt.client.widgets.StretchImgButton} component, which renders via images, or may be based on the
* {@link com.smartgwt.client.widgets.Button} component, which renders via CSS styles.
*/
public class FileUploadButton extends IButton {
private String filename;
private ValueCallback callback;
public FileUploadButton(String action, String fieldName, String title) {
setTitle(title);
createAndInitUploadForm(action, fieldName);
}
/**
* Set the accept types (e.g. text/plain) of files, which will affect the file extension filter of "Open" dialog.
*/
public void setAccpetTypes(String types) {
fileUpload.getElement().setAttribute("accept", types);
}
/**
* Set the callback when the submission is completed.
*/
public void setCallback(ValueCallback callback) {
this.callback = callback;
}
/**
* Return the filename that has been chosen or an empty string.
*/
public String getFileName() {
return filename;
}
private FormPanel form; // GWT widget
private FileUpload fileUpload; // GWT widget
private static native void clickOnInputFile(Element elem) /*-{
elem.click();
}-*/;
private void createAndInitUploadForm(String action, String fieldName) {
form = new FormPanel();
form.setAction(action);
form.setMethod(FormPanel.METHOD_POST);
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.addSubmitCompleteHandler(new SubmitCompleteHandler() {
public void onSubmitComplete(SubmitCompleteEvent event) {
setDisabled(false);
if (callback != null) {
callback.execute(event.getResults());
}
}
});
fileUpload = new FileUpload();
fileUpload.setName(fieldName);
fileUpload.addChangeHandler(new ChangeHandler() {
public void onChange(ChangeEvent event) {
filename = fileUpload.getFilename();
if (!filename.isEmpty()) {
setDisabled(true);
form.submit();
}
}
});
form.setWidget(fileUpload);
// Trick to draw an invisible form on the button canvas. Note that the width and the height cannot be a
// negative or zero, because it will cause the form not to be created onto the canvas!
form.setVisible(false);
form.setWidth("1px");
form.setHeight("1px");
addChild(form);
addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
clickOnInputFile(fileUpload.getElement());
}
});
}
}
您可以根据需要将IButton更改为任何其他SmartGwt小部件。它适合我,周末愉快。