Deferred is happening asynchronous, so you can't think in incremental,
imperative code. You pseuodosample could f.ex. be written as:
<div id="out"></div>
<input type="button" id="btn" value="clickme" />
<script>
var onClick = function() {
var onCheck = function(data) {
getElement("out").innerHTML = data;
}
var d = loadJSONDoc("/foo/bar");
d.addCallback(onCheck);
}
connect(getElement("btn"), "onclick", onClick);
</script>
When The button is clicked, onClick is called. This calls loadJSONDoc.
When loadJSONDoc is done, it calls local function onCheck.
Hope this helps.
On 11/13/06, .M. <[EMAIL PROTECTED]> wrote:
>
> Hi there. I'm having trouble using Deferreds to do some basic AJAX
> calls. Something fundamental I'm not clear on yet.
>
> With re. to the following fragment
>
> Q) Where does the callback function return its variable to? How can you
> access it?
>
> Q) How can you check whether the callback has happened yet from another
> function (e.g. business() below so that you don't continue until it's
> taken place?
>
> function check() {
> d.loadJSON("/foo/bar");
> d.addCallback(resultsItem);
> }
>
> function resultsItem() {
> // record the results of the checking someplace - where?
>
> checks = something;
> return checks;
> }
>
> function business() {
> check();
>
> // don't go forward until results of check are handled
>
> do something reliant on check() being accurate;
> }
>
> Any help would be great!
>
> Thanks
> .M.
>
>
> >
>
--
troels
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