Re: AJAX update and file download on Wicket 1.5
Hi,
the browser sends in a separate request to fetch the resource. You
cannot show any feedback from there.
You can add an error to the session, and let the web page poll with ajax
requests for any problems.
Regards
Sven
On 06/13/2014 03:35 AM, msalman wrote:
Hi,
Suppose there is some problem or exception in the file download. Let's say
in the following method:
protected IResourceStream getResourceStream() {
return new AbstractResourceStreamWriter() {
public void write(Response output) {
WebResponse response = (WebResponse)output;
byte[] buffer = new byte[256];
try {
int read;
while((read = is.read(buffer)) != -1) {
response.write(buffer, 0, read);
response.flush();
}
response.close();
} catch (Exception e) {
response.write(e.toString().getBytes());
response.close();
}
}
};
}
And I want to show the error in the feedback panel for the page. How can I
do that? The AjaxRequestTarget is not available here. I tried to do
something like the following but it did not work:
parentPage.getSession().error(error);
WebApplication app = (WebApplication)getComponent().getApplication();
AjaxRequestTarget target = app.newAjaxRequestTarget(parentPage);
target.add(parentPage.getFeedback());
I also tried saving the AjaxRequestTarget passed in the initiate method as a
member variable of the class and use it later for posting the error. Well,
for one it did not work. For second, I got the non serializable error for
the target in the log.
Thanks
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Re: AJAX update and file download on Wicket 1.5
Thanks for your response. Can you please kindly provide an outline or a few lines of code to get me started. My particular concerns are: 1. How do I create an Ajax request and AjaxRequestTarget. Will this be another Ajaxbehaviour. Sorry I should have learned this by now but... 2. How and when do I stop this polling and end the original onSubmit call. Thanks. -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/AJAX-update-and-file-download-on-Wicket-1-5-tp4095241p4666260.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: AJAX update and file download on Wicket 1.5
You can always redirect to an error page incase of exceptions / errors. -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/AJAX-update-and-file-download-on-Wicket-1-5-tp4095241p4666261.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: AJAX update and file download on Wicket 1.5
Well, that is exactly what we are trying to avoid. An error page is a must fix bug. Thanks. -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/AJAX-update-and-file-download-on-Wicket-1-5-tp4095241p4666262.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: AJAX update and file download on Wicket 1.5
Hi,
Suppose there is some problem or exception in the file download. Let's say
in the following method:
protected IResourceStream getResourceStream() {
return new AbstractResourceStreamWriter() {
public void write(Response output) {
WebResponse response = (WebResponse)output;
byte[] buffer = new byte[256];
try {
int read;
while((read = is.read(buffer)) != -1) {
response.write(buffer, 0, read);
response.flush();
}
response.close();
} catch (Exception e) {
response.write(e.toString().getBytes());
response.close();
}
}
};
}
And I want to show the error in the feedback panel for the page. How can I
do that? The AjaxRequestTarget is not available here. I tried to do
something like the following but it did not work:
parentPage.getSession().error(error);
WebApplication app = (WebApplication)getComponent().getApplication();
AjaxRequestTarget target = app.newAjaxRequestTarget(parentPage);
target.add(parentPage.getFeedback());
I also tried saving the AjaxRequestTarget passed in the initiate method as a
member variable of the class and use it later for posting the error. Well,
for one it did not work. For second, I got the non serializable error for
the target in the log.
Thanks
--
View this message in context:
http://apache-wicket.1842946.n4.nabble.com/AJAX-update-and-file-download-on-Wicket-1-5-tp4095241p4666243.html
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Re: AJAX update and file download on Wicket 1.5
So I modified my AjaxFileDownload init method to eliminate the abstraction of
getResourceStream. Code as follows:
AjaxFileDownload.java... Similar to AJAXDownload described in the Wiki
https://cwiki.apache.org/WICKET/ajax-update-and-file-download-in-one-blow.html
except for the following modifications:
/**
* Call this method to initiate the download.
*/
public void initiate(AjaxRequestTarget target, String fileName,
InputStream is) {
this.fileName = fileName;
this.is = is;
String url = getCallbackUrl().toString();
if (addAntiCache) {
url = url + (url.contains(?) ? : ?);
url = url + antiCache= + System.currentTimeMillis();
}
// the timeout is needed to let Wicket release the channel
target.appendJavaScript(setTimeout(\window.location.href=' + url
+ '\, 100););
}
/**
* Hook method providing the actual resource stream.
*/
protected IResourceStream getResourceStream() {
return new AbstractResourceStreamWriter() {
public void write(Response output) {
WebResponse response = (WebResponse)output;
byte[] buffer = new byte[256];
try {
int read;
while((read = is.read(buffer)) != -1) {
response.write(buffer, 0, read);
response.flush();
}
response.close();
} catch (Exception e) {
response.write(e.toString().getBytes());
response.close();
}
getComponent().getRequestCycle().setResponsePage(MCEVToolPage.class);
}
};
}
Implementation:
final AjaxFileDownload fileDownload = new AjaxFileDownload();
AjaxLink fileDownloadLink = new AjaxLink(fileDownloadLink) {
@Override
public void onClick(AjaxRequestTarget target) {
StringBuilder fileNameBuilder = new StringBuilder();
//Build filename
.
.
StringBuilder dataBuilder = new StringBuilder();
//builder data to be included in the file
..
..
fileDownload.initiate(target, fileNameBuilder.toString(), new
ByteArrayInputStream(dataBuilder.toString().getBytes()));
}
}
fileDownloadLink.add(fileDownload);
add(fileDownloadLink);
Now you can create a single instance of AjaxFileDownload and include that in
your Application file and request when ever needed.
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AJAX update and file download on Wicket 1.5
Hi,
I want to do an AJAX update and then start a file download.
I've found this solution for Wicket 1.4.x
https://cwiki.apache.org/WICKET/ajax-update-and-file-download-in-one-blow.html
This is not working on Wicket 1.5 because this deprecated code:
public void onRequest()
{
getComponent().getRequestCycle().setRequestTarget(
new ResourceStreamRequestTarget(getResourceStream(),
getFileName()));
}
Which is the best way to do this in 1.5 ?
Thanks!.
--
a10! i fins aviat.
J:-Deu
Re: AJAX update and file download on Wicket 1.5
On Tue, Nov 22, 2011 at 1:13 PM, Jordi Deu-Pons jo...@jordeu.net wrote:
Hi,
I want to do an AJAX update and then start a file download.
I've found this solution for Wicket 1.4.x
https://cwiki.apache.org/WICKET/ajax-update-and-file-download-in-one-blow.html
This is not working on Wicket 1.5 because this deprecated code:
public void onRequest()
{
getComponent().getRequestCycle().setRequestTarget(
new ResourceStreamRequestTarget(getResourceStream(),
getFileName()));
getComponent().getRequestCycle().scheduleRequestHandlerAfterCurrent(
new ResourceStreamRequestHandler(getResourceStream(),
getFileName()));
}
Which is the best way to do this in 1.5 ?
Thanks!.
--
a10! i fins aviat.
J:-Deu
--
Martin Grigorov
jWeekend
Training, Consulting, Development
http://jWeekend.com
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Re: AJAX update and file download on Wicket 1.5
Jordi,
Can you please update the wiki page with Martins suggestion for 1.5.x?
Regards,
Ernesto
On Tue, Nov 22, 2011 at 1:11 PM, Martin Grigorov mgrigo...@apache.org wrote:
On Tue, Nov 22, 2011 at 1:13 PM, Jordi Deu-Pons jo...@jordeu.net wrote:
Hi,
I want to do an AJAX update and then start a file download.
I've found this solution for Wicket 1.4.x
https://cwiki.apache.org/WICKET/ajax-update-and-file-download-in-one-blow.html
This is not working on Wicket 1.5 because this deprecated code:
public void onRequest()
{
getComponent().getRequestCycle().setRequestTarget(
new ResourceStreamRequestTarget(getResourceStream(),
getFileName()));
getComponent().getRequestCycle().scheduleRequestHandlerAfterCurrent(
new ResourceStreamRequestHandler(getResourceStream(),
getFileName()));
}
Which is the best way to do this in 1.5 ?
Thanks!.
--
a10! i fins aviat.
J:-Deu
--
Martin Grigorov
jWeekend
Training, Consulting, Development
http://jWeekend.com
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Re: AJAX update and file download on Wicket 1.5
Ok,
I'll test this solution and update the wiki.
Thanks.
On Tue, Nov 22, 2011 at 1:17 PM, Ernesto Reinaldo Barreiro
reier...@gmail.com wrote:
Jordi,
Can you please update the wiki page with Martins suggestion for 1.5.x?
Regards,
Ernesto
On Tue, Nov 22, 2011 at 1:11 PM, Martin Grigorov mgrigo...@apache.org
wrote:
On Tue, Nov 22, 2011 at 1:13 PM, Jordi Deu-Pons jo...@jordeu.net
wrote:
Hi,
I want to do an AJAX update and then start a file download.
I've found this solution for Wicket 1.4.x
https://cwiki.apache.org/WICKET/ajax-update-and-file-download-in-one-blow.html
This is not working on Wicket 1.5 because this deprecated code:
public void onRequest()
{
getComponent().getRequestCycle().setRequestTarget(
new ResourceStreamRequestTarget(getResourceStream(),
getFileName()));
getComponent().getRequestCycle().scheduleRequestHandlerAfterCurrent(
new ResourceStreamRequestHandler(getResourceStream(),
getFileName()));
}
Which is the best way to do this in 1.5 ?
Thanks!.
--
a10! i fins aviat.
J:-Deu
--
Martin Grigorov
jWeekend
Training, Consulting, Development
http://jWeekend.com
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--
a10! i fins aviat.
J:-Deu
