Tobia Conforto wrote:
Hello
I'm trying to implement in Cocoon a somewhat standard web behaviour: at
the end of a form (final POST request, form fully validated, etc.) I'd
like to redirect the user to a GET request before showing him the final
'Thank you' page.
This is often done in web programming, so that in case the user reloads
the result page, he will just reload the page itself, and not execute
the form logic twice. The browsers use this interpretation too, by
showing the user a warning "The form action will be executed again if
you reload. Are you sure? Yes/No" when you try to reload a POST page.
I thought this would be easy to accomplish with continuations, but I'm
hitting a strange bug. This is the utility function I'm calling from my
flows, AFTER the form has been processed (DB inserts, emails sent, etc),
just BEFORE doing the sendPage() with the result page:
function redirectToGet() {
var done = false;
var cont = cocoon.createWebContinuation();
if (! done) {
done = true;
cocoon.redirectTo('/cont=' + cont.id, true);
cocoon.exit();
}
}
The problem is:
- if I leave out the cocoon.exit(), I get:
IllegalStateException: Pipeline has already been processed for this request
- if I put the cocoon.exit() as shown, I get:
ProcessingException: Attempted to process incomplete pipeline
What gives?
I'm using Cocoon 2.1.10
I'm not sure about the specific errors you're getting, but here's how I
accomplish the double-submit prevention:
var finished = false;
form.showForm(...);
if(!finished) {
form.save(bean);
myJavaService.doDatabaseUpdate(bean);
finished = true;
}
cocoon.sendPage("confirmation-page");
So if the user reloads the confirmation page, the block that performs
the database update will be skipped, and the confirmation page
redisplayed. It's not a GET redirect, but performs the same function
quite well. Sorry to not answer your specific question, but perhaps the
alternate approach will help.
--Jason
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