Hi Ismael,
here is the code for a non-cached download link. (I don't know whether
this really solves your problem but just in case.)
final NamesCsvStreamWriter stream = new NamesCsvStreamWriter();
ResourceStreamResource rsr = new ResourceStreamResource(stream) {
@Override
protected ResourceResponse newResourceResponse(Attributes attributes) {
stream.initContent(provider.getFilteredList());
return super.newResourceResponse(attributes);
}
@Override
protected void configureCache(ResourceResponse data,
Attributes attributes) {
Response response = attributes.getResponse();
((WebResponse)response).disableCaching();
}
};
rsr.setContentDisposition(ContentDisposition.ATTACHMENT);
rsr.setTextEncoding(UTF_8);
rsr.setFileName("export.csv");
form.add(new ResourceLink<ResourceStreamResource>("export", rsr));
Cheers,
Chantal
On Mon, 2011-11-14 at 12:39 +0100, Ismael Hasan wrote:
> Hello,
>
> I want to make a DownloadLink for a dynamic resource, a file generated on
> the fly; to do this, I overwrite the "onClick" method of DownloadLink so
> the file is generated whenever the link is clicked. In the context of my
> problem, it should happen that 2 clicks on the link should return different
> files without reloading the page.
>
> The problem I am facing is that the browser caches the link by its "src"
> attribute, so the "onClick" method is only called the first time: with the
> next clicks the browser directly returns the file generated in the first
> "onClick" (and previously downloaded).
>
> Is there a clean solution to this problem? The solutions I thought so far
> are pretty dirty:
>
> 1.- Instead of having a link, have a list of links, generate a new link
> whenever the link is clicked, and refresh the list via Ajax, so instead of
> a "dynamic" link there will be a new link each time.
> 2.- Add to the link a "foo" parameter each time it is clicked, so the
> browser sees it as a different link. I don't know how to do this, any
> insight will be appreciated.
>
>
> Thank you for your attention,
>
> Ismael.
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