Re: File download and Exception handling using a servlet.
Hi Appien Ho do you call the servlet ? http://www.html5bydemo.com/ -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/WeXfqz5OpVgJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: File download and Exception handling using a servlet.
Hi Bowie,
I use the code below. The PDF_HOST_URL variable is the url to my local
servlet. downloadFrame is a GWT Frame object.
pdfService.storeFormInSession(form, new AsyncCallbackEfPdfData() {
public void onSuccess(EfPdfData arg0) {
RootPanel.get().remove(downloadFrame);
downloadFrame.setUrl(PDF_HOST_URL);
downloadFrame.setVisible(false);
RootPanel.get().add(downloadFrame);
downloadFrame.addLoadHandler(new LoadHandler() {
public void onLoad(LoadEvent arg0) {
waitDialog.hide();
}
});
new ReadyStateWatch(downloadFrame, waitDialog).addReadyStateChangeHandler(
new ValueChangeHandlerReadyState() {
public void onValueChange(ValueChangeEventReadyState event) {
}
});
}
public void onFailure(Throwable exception) {
new EfDialog(exception.getMessage()).show();
waitDialog.hide();
}
});
On 14 March 2012 10:22, dodo dard keratonj...@gmail.com wrote:
Hi Appien
Ho do you call the servlet ?
http://www.html5bydemo.com/
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Re: File download and Exception handling using a servlet.
Hi Albert,
The way I did this is by reading SubmitCompleteEvent.getResults(), i.e.
uploadForm.addSubmitCompleteHandler(new SubmitCompleteHandler() {
public void onSubmitComplete(SubmitCompleteEvent event) {
if (event.getResults().contains(SizeException)
Window.alert(Data entry over limit);
}
}
You would just have to make sure that the servlet which handles the upload
generates some meaningful, machine readable output which you can parse on
the client
On Monday, March 12, 2012 12:19:29 PM UTC+2, Appien wrote:
Hi guys,
In my GWT application the user can download a PDF file by using a servlet.
To start the download I create in GWT a hidden Frame Object which calls the
servlet. The happy workflow path works great however I want give the user
some feedback when generating the PDF file fails. Since the result of the
servlet call gets ‘printed’ in the Frame object, the printed exception also
appears in the hidden Frame and not e.g. by a popup for the user.
Unfortunately I don’t see a way so the servlet throws directly exceptions
to the AsyncCallback of GWT.
I’ve the following pseudo code for handling my exception.
My questions are the following:
- Is this the right way to do exception handling for servlet exceptions
in GWT?
- If not, which approach should I use for this?
Many thanks for all the help!
Albert
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Re: File download and Exception handling using a servlet.
Hi Bowie, Im actually interested in how to read the error code or exception when setting an url in a frame object. When the servlet call goes correct correct, the browser shows a file download window. If the servlet call fails, the frontend needs to be aware of this somehow. Do I need somehow read the content of the frame object? If so, how can I achieve this? There is no AsyncCallback object since I just set an url of a frame. Thanks. Albert On 12 March 2012 15:29, dodo dard keratonj...@gmail.com wrote: Helo, Well it is a delicate subject to handle. There is no default method to deal with the error result. A way to approach this, is by testing the servlet response. The fastest is to make sure that there is no ERROR CODE (404, 503 ...) in resultHtml. But this make your application depends on your servlet container implementation. If you can rewritte your ServletReponse, then you can decide your own error code and how to handle it. Hope this help you, Bowie http://www.html5bydemo.com/ On Mar 12, 11:19 am, Appien appienvanv...@gmail.com wrote: Hi guys, In my GWT application the user can download a PDF file by using a servlet. To start the download I create in GWT a hidden Frame Object which calls the servlet. The happy workflow path works great however I want give the user some feedback when generating the PDF file fails. Since the result of the servlet call gets ‘printed’ in the Frame object, the printed exception also appears in the hidden Frame and not e.g. by a popup for the user. Unfortunately I don’t see a way so the servlet throws directly exceptions to the AsyncCallback of GWT. I’ve the following pseudo code for handling my exception. My questions are the following: - Is this the right way to do exception handling for servlet exceptions in GWT? - If not, which approach should I use for this? Many thanks for all the help! Albert -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
File download and Exception handling using a servlet.
Hi guys, In my GWT application the user can download a PDF file by using a servlet. To start the download I create in GWT a hidden Frame Object which calls the servlet. The happy workflow path works great however I want give the user some feedback when generating the PDF file fails. Since the result of the servlet call gets ‘printed’ in the Frame object, the printed exception also appears in the hidden Frame and not e.g. by a popup for the user. Unfortunately I don’t see a way so the servlet throws directly exceptions to the AsyncCallback of GWT. I’ve the following pseudo code for handling my exception. My questions are the following: - Is this the right way to do exception handling for servlet exceptions in GWT? - If not, which approach should I use for this? Many thanks for all the help! Albert -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/wh4QKEY6lPUJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: File download and Exception handling using a servlet.
Helo, Well it is a delicate subject to handle. There is no default method to deal with the error result. A way to approach this, is by testing the servlet response. The fastest is to make sure that there is no ERROR CODE (404, 503 ...) in resultHtml. But this make your application depends on your servlet container implementation. If you can rewritte your ServletReponse, then you can decide your own error code and how to handle it. Hope this help you, Bowie http://www.html5bydemo.com/ On Mar 12, 11:19 am, Appien appienvanv...@gmail.com wrote: Hi guys, In my GWT application the user can download a PDF file by using a servlet. To start the download I create in GWT a hidden Frame Object which calls the servlet. The happy workflow path works great however I want give the user some feedback when generating the PDF file fails. Since the result of the servlet call gets ‘printed’ in the Frame object, the printed exception also appears in the hidden Frame and not e.g. by a popup for the user. Unfortunately I don’t see a way so the servlet throws directly exceptions to the AsyncCallback of GWT. I’ve the following pseudo code for handling my exception. My questions are the following: - Is this the right way to do exception handling for servlet exceptions in GWT? - If not, which approach should I use for this? Many thanks for all the help! Albert -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
