> I have two calls run asyncronously
> Two - is an example - they may be N-calls :)
I'd recommend avoiding that unless the async calls are to *different*
servers, and if you do two at once, certainly never do more than two
at once. Run just a single async request at a time, two if you
absolutely have to, and chain them using the `success` handler.
Why? Because browsers (and some servers) clamp down the number of
connections to a given server at the same time. Mostly, with modern
desktop browsers, you can expect the browser will allow four[1] (up
from the previous figure of two), but IE will drop down to only
allowing two if it detects a dial-up connection and you don't know
what the next "dot" rev of any browser may do. Also, mobile browsers
have lower limits.
In terms of mechanism, I'd probably have a pending count (no need for
global variables):
* * * *
// Start the requests defined in the array `requests`, call `callback`
// when they've all finished.
function sendMultipleRequests(requests, callback) {
var req, pending;
// Prep and start each request. We assume the objects have a `url`
// property and a `params` property.
pending = 0;
while (pending < requests.length) {
// Get this request
req = requests[pending];
// Hook into the onComplete, respecting the previous one if
any
req.params = req.params || {};
req.params.onComplete = req.params.onComplete
? req.params.onComplete.wrap(reqComplete)
: reqComplete;
// Start and count this request
new Ajax.Request(req.url, req.params);
++pending;
}
function reqComplete() {
--pending;
if (pending <= 0) {
// All done, call the callback.
// Note that there's no race condition with the loop above
(e.g.,
// there's no possibility we'll be called and decrement
`pending`
// to 0 while the loop above is still incrementing it)
because
// JavaScript on browsers is single-threaded unless you
explicitly
// use the web workers stuff, which we aren't.
callback();
}
}
}
[1] http://www.stevesouders.com/blog/2008/03/20/roundup-on-parallel-connections/
HTH,
--
T.J. Crowder
Independent Software Engineer
tj / crowder software / com
www / crowder software / com
On Nov 21, 8:40 pm, buda <[email protected]> wrote:
> I have two calls run asyncronously
> I need to wait when they both is comleted and only then do somthing
> Two - is an example - they may be N-calls :)
>
> What is the right method to do it?
> Is theere an object somthing AsyncWaitFor(AjaxCall1...AjaxCallN)?
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