I have some queries when trying to implement a fileupload widget in my application. After many tries, it just doesn't seem to work.
Hence, I tried getting working solutions to see if I can understand anything from there.
http://code.google.com/p/faculty-gwt/source/checkout
However, I tried uploading a file using this and it seems that I am getting error messages too. and what is that textbox and listbox suppose to do? It is meant for showing an example of validating an input bef开发者_如何学编程ore submitting?
Can someone guide me along to solve this? Thanks.
Never tried to use the link you provided, but this is what i did to use a a GWT FileUpload widget:
I built a File Upload widget using the uibinder:
<g:FormPanel ui:field="docForm">
<g:FlowPanel ui:field="inputPane">
/*other displayed info*/
<g:FileUpload ui:field="DocPath"/>
/*other displayed info*/
</g:FlowPanel>
</g:FormPanel>
(Per the GWT api, FileUpload widgets can only be used from a FormPanel)
Make sure you set these in the FormPanel, otherwise you'll probably have issues:
yourFormPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
yourFormPanel.setMethod(FormPanel.METHOD_POST);
That widget is dropped into my container page, then added to the display panel:
private FileUploadWidget createNewUploader(){
FileUploadWidget uploader = new FileUploadWidget(/*my constructor params*/);
uploader.addChangeHandler(new ChangeHandler() {
@Override
public void onChange(ChangeEvent event) {
DocPanel.add(createNewUploader());
}
});
return uploader;
}
My OnChange event is so that I have a new, blank uploader available when i use the current one.
and when I'm ready to submit:
private void processUpload(FileUploadWidget upload, int id) {
upload.setId(id);
//Don't bother to submit an empty one.
if (upload.IsFileSelected())
upload.Submit();
}
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