I was not aware of the "call" method. Thanks!
-deech
On Thu, Oct 8, 2009 at 4:11 AM, Matthew Gregory
<[email protected]<matthew%[email protected]>
> wrote:
> Hi Again,
> You need to change context.func(resp); to func.call(context, reps);
> This has nothing to with it being a static class the orriginal code
> won't work.
>
> Also in your calling code you do not have any closures so you don't need
> to sore 'this' in 'that' simply do this:
>
> var callback = Utility.makeCallBack(this.setAndPrintResponse, this);
>
> I can't say for sure without looking at the rest of your code put your
> makeCallBack function is the same as qx.lang.Function.bind
>
> aditya siram wrote:
> > 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]> <mailto:
> matthew%[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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