jQuery promises also aren't interoperable with other promise-consuming
libraries, because they do not transform errors thrown in callbacks into
rejection reasons, violating Promises/A. So e.g.
function doOperationAndDontGiveUp(operation) {
return operation().then(null, function (error) {
if (error instanceof TemporaryNetworkError) {
return doOperationAndDontGiveUp(operation);
}
throw error;
});
}
doOperationAndDontGiveUp(whatever).then(console.log, function (error) {
console.log("A non-temporary error: ", error);
});
will not work, because you can't re-throw errors in jQuery to stay in a
rejected state; the error will end up uncaught by any handlers except
window.onerror/process.on("uncaughtException"), and so the rejection
handler will never be called.
There's also the issue where jQuery promises can be resolved with multiple
values, which other libraries cannot consume.
You're better off using a different promise library, like Kris Kowal and
myself's Q, or Mariusz's deferred, or When, in both the browser and the
server, and immediately converting any jQuery promises to real Promises/A
promises using e.g. Q.when(jQueryPromise).
On Tuesday, October 2, 2012 12:01:03 PM UTC-4, Jeff Barczewski wrote:
>
> Mariusz,
>
> I was using an old version of your deferred module, Deferred@0.1.1 which
> was API compatible with jQuery.
>
> I guess for upgrading many things have changed since then:
>
> - .promise() becomes .promise
> - Deferred.when() - I will have to create my own, right?
>
> Anything else that you remember which will need to change? (I know this
> was a long time ago when you changed it so not a big deal if you don't
> remember)
>
>
> If I want to keep the jQuery.Deferred style API (for consistency on all
> client and server code) but use your latest module, then I guess I need to
> create some light adapters which will use your api under the covers.
>
> If you have any other ideas or thoughts on this let me know.
>
> Thanks in advance!
>
> Jeff
>
>
>
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