Thanks for the reply Matt and Axel - those solutions worked. However I do
have a further question.
I wanted to take that function that creates a callback and move it to a
static utility class.
class Utility:
type : 'static'
members :
makeCallback(func, context) {
var _func = function (resp) {context.func(resp);};
return _func;
}
And then pass it a function from Class A like :
var that = this;
car callback = Utility.makeCallBack(this.setAndPrintResponse, that);
But this doesn't work - Firebug complains that 'context.func' is not a
function.
What is the difference between this code being in the 'ask' function as
below, and in a static class?
-deech
On Fri, Oct 2, 2009 at 7:14 AM, Matthew Gregory
<[email protected]<matthew%[email protected]>
> wrote:
> Axel's suggestion will work, but you need to pass the parameter
>
> class A:
> members :
> response : null,
> ask : function () {
> var that = this;
> var callback = function(resp) {
> that.setAndPrintResponse(resp);
> };
> util.makeServerRequest(callback)
> },
> setAndPrintResponse : function (resp) {
> this.debug(resp);
> this.response = resp;
> }
>
>
> Also have a look at the api for qx.lang.Function.bind. You can think of
> it as returning a function pointer where the context is bound to the
> object that you passed into the bind function.
>
> HTH,
> Matt
>
> Axel wrote:
> > Hi aditya,
> >
> >> Suppose I have the following class A (pseudo-code) :
> >> class A:
> >> members :
> >> response : null,
> >> ask : function () { util,makeServerRequest
> >> (this.setAndPrintResponse)},
> >> setAndPrintResponse : function (resp) {
> >> this.debug(resp);
> >> this.response = resp;
> >> }
> >>
> >> The "ask" function sends the server a request asynchronously and when
> >> the reply is received, prints it to the console and updates the instance
> >> variable "response".
> >>
> >> Unfortunately this doesn't work, because the makeServerRequest is part
> >> of a static class and looks like this:
> >
> > I would try this:
> >
> > class A:
> > members :
> > response : null,
> > ask : function () {
> > var that = this;
> > var callback = function() {
> > that.setAndPrintResponse();
> > };
> > util.makeServerRequest(callback)
> > },
> > setAndPrintResponse : function (resp) {
> > this.debug(resp);
> > this.response = resp;
> > }
> >
> > see also
> >
> http://qooxdoo.org/documentation/0.8/snippets#problems_with_this_in_event_handlers
> .
> >
> > Cheers,
> > Axel
> >
> >
> >
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