Sounds like it'd be a lot easier to just fire the first request with a
handler function that fires the next request, and so on, using
onreadystatechange.
L.
Frank W. Zammetti wrote:
No Wendy, you are correct in your explanation :) I see Ajax in Action
is serving you well :)
I wouldn't expect it to be the best answer though because that parameter
blocks *all* Javascript, not just further XMLHttpRequest's.
What you will probably want to do Michael is build up a queue on the
client and write some code to ensure the order the handlers fire. This
could be pretty tricky to say the least.
Take a look at the RequestSender tag in AjaxTags in Java Web Parts...
AjaxTags builds up such a queue so that multiple requests can fire
simultaneously without stepping on each other. I suspect you would be
able to extend this to ensure firing order. Off the top of my head, I
would think you would need to set up a timer, and when the responses
come back, instead of processing them on the spot in the callback,
instead set a flag in the call structure that says "yes, this request
completed, but don't process it until the previous one completes"...
fire the timer every half a second or something like that to examine all
the call structures in the queue and fire them as appropriate.
Probably not a trivial exercise, but should be doable.
Frank
Wendy Smoak wrote:
On 2/1/06, Michael Jouravlev <[EMAIL PROTECTED]> wrote:
Hi, Ajax gurus, I have an OT question: how to ensure the proper order
of several XHRs? I found how to create several XHRs simultaneously,
but I have a requirement: to wait for the first request to return
before firing the second,
(Hardly an expert but...) the third parameter of
XMLHttpRequest.open(...) is a flag that says whether the request
should be asynchronous. It's usually true. Set it to false and I
think it will block until the response is received. Frank will now
correct me if I'm wrong. :)
And lets move to the user list if this gets any further off topic,
shall we?
--
Wendy
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