"Arnar Birgisson" <[EMAIL PROTECTED]> writes:
> Hi there,
Hi Arnar.
> I believe you are on the right track. You should be able to get a
> deferred by calling loadJSONDoc and adding your callbacks:
I can't do that. I have to call two different "loadJSONDoc"s, one in each
callback to build some DOM and swap what I have on HTML while in the third
callback.
> var d = loadJSONDoc('someurl');
> d.addCallback(func1);
> d.addCallback(func1);
> d.addCallback(processResults);
>
> function func1 (x) {
> // do some processing, calculate y
> return y;
> }
>
> function func2 (y) {
> // do some calculation, find z
> return [y, z];
> }
>
> function processResults(result) {
> y = result[0];
> z = result[1];
> // do something with y and z
> }
My case is more like:
d = new Deferred()
d.addCallback(func1);
d.addCallback(func1);
d.addCallback(processResults);
function func1 (x) {
var d = loadJSONDoc('someurl');
// do some processing, calculate y
return y;
}
function func2 (y) {
var d = loadJSONDoc('someurl');
// do some calculation, find z
return [y, z];
}
function processResults(result) {
y = result[0];
z = result[1];
// do something with y and z
}
I tried this approach, but I only got data in "result[0]", with "result[1]"
being an "unfired" callback (this is what I got from the log messages.
> Once the JSON request is loaded, func1 is called with the result
> (already evaluated to a Javascript object, no need for
> evalJSONRequest), func2 is called with the result of func1 - which
(I'm not using loadJSONDoc. It didn't work here while the normal
getXMLHttpRequest did... So, I still have to evalJSONRequest :-()
> combines it with its own result. processResults is then called with
> the result of func2.
This is what I tried but didn't work...
> There's no need for globals. Seems to me you are using three callbacks
> to deferred, using the first one to initiate the AJAX request.
Nope. I use three callbacks using the first two to initiate two different
AJAX requests.
> The problem you have I think is here:
> var d = new Deferred();
> d.addCallback(get_amostras_analises);
> d.callback();
> d.addCallback(get_analises_fator_correcao);
> d.addCallbacks(monta_tabela_resultados, metadataFetchFailed);
>
> What happens is that when you add the last two callbacks, they get
> called immediately since you already called d.callback() (see
> MochiKit.Async manual).
This is no problem... What can't happen is the third being called without a
return from both the first and the second AJAX requests. Since callbacks were
called in the order they were added, I thought they would solve the problem.
> The deferred you return from the first callback is thus not ready when
> it's passed to the second and third one.
>
> If you're simply loading a JSON document, there's no need to create
> the Deferred yourself, just use loadJSONDoc(url) which creates and
> returns the Deferred for you. You rarely have to create Deferreds
> yourself at all - that's what the functions in Async are for
> (loadJSONDoc, callLater, wait, etc.)
>
> Hope I'm understanding your problem correctly :o)
>
> I found Deferred confusing at first since you "addCallbacks" _after_
> you initiate the request (like with loadJSONDoc). The important thing
> to remember is that Javascript events are processed in loops, so you
> Deferred won't change it's state until the next event-loop - so you
> have ample time to add callbacks.
If I could add a callback to the next function while in the function, then
maybe I could get what I want, right?
What I want? It might be described byt the following "pseudocode" sequence:
result1 = doAjax1()
result2 = doAjax2()
func3(result1, result1)
I just need the results when the third callback (func3 here) is called.
--
Jorge Godoy <[EMAIL PROTECTED]>
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