Oops, forgot to set the method (not that it really matters); fixed:

-- T.J.

On Sep 12, 10:16 am, "T.J. Crowder" <t...@crowdersoftware.com> wrote:
> Hi,
> In this situation, I just do a normal (non-Ajax) form POST with the
> `target` attribute set to reference a hidden iframe, triggering the
> submit via code -- something like this:http://jsbin.com/omuge3(in
> that example the iframe is hidden in a somewhat naive way; I'm not at
> my main workstation and don't immediately recall the full markup I
> use). Since the iframe is hidden and therefore won't show the user any
> errors that may occur, I do two further things not shown in that JSBin
> post: 1. I send a cookie in the response that tells the client-side
> code the response has come back and gives a success flag or error
> message (polling for the cookie on the client), and 2. I poll the
> content of the iframe in case an error occurs even sending the request
> (in which case I won't see the cookie). Works a treat, all the user
> sees is a download dialog (on success) or an error message from my app
> (on failure). I only do stuff like this in apps where JavaScript is
> already a requirement, of course. Keep meaning to do a blog post on
> this technique, but the above covers the basics.
> HTH,
> --
> T.J. Crowder
> Independent Software Consultant
> mail: tj / crowder software / com
> web: www / crowder software / com
> On Sep 10, 7:19 pm, Blaine <blaine.simp...@admc.com> wrote:
> > When one assigns to window.location, the web browser automatically
> > invokes attachment-handling according to the contentType if the
> > response's Content-Disposition is set to "attachment".  The same thing
> > happens if the request is elicited by a traditional form submittal or
> > triggering an href linked to the Content-Disposition==attachment
> > target.
> > My use case seem pretty simple to me.  I need to post a bunch of data
> > via postBody, and the response will be an attachment.  Both parts are
> > prosaic and simple, but web searches find nothing on the Internet of
> > anybody trying to do both of these things.  Seems that as soon as Ajax
> > is introduced, you lose the ability for the browser to automatically
> > handle attachments, and I find no ability to handle them manually via
> > w3c DOM API or PrototypeJS API  (viz. to have the browser open the
> > Open/Save-As pop-up).
> > To maybe prevent a couple exchanges...  I do need to use "post" method
> > due to the nature of the data (that the attachment will be generated
> > from).  I do not want to hold/cache data on the server for a
> > subsequent traditional fetch:  This is clean and atomic as a single
> > post transaction and I don't want to introduce memory contention
> > issues and the opportunity for memory leaks.  I tried PrototypeJS's
> > form.request() in hopes that if no callback was specified maybe the
> > browser's default handler would be used... but it ain't.

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