Hello again,
thanks for your help, Gene. No, fixing the typo did not solve the
problem. But there was second typo (a ";" at the end of the line of the
if-statement) which _did_ solve the problem. Thanks!
Michael
Gene Amtower schrieb:
> So, did fixing the typo fix the problem? You didn't say, but I
> suspect that might affect things negatively! ;-)
>
> On Thu, 2009-06-11 at 00:04 +0200, Michael Helwig wrote:
>> Sorry, there is a typo in the source. It should read:
>>
>> "qx.event.message.Bus.unsubscribe("CONFIG LOADED",this.buildGUI,this);"
>>
>> instead of
>>
>> "qx.event.message.Bus.unsubscribe("CONFIG_LOADED",this.buildGUI,this);"
>>
>> Greets,
>> Michael
>>
>> Michael Helwig schrieb:
>> > Hi Gene,
>> >
>> > thanks, you are right, this at least works in the Playground. But I'm
>> > still having problems in my actual code. My Application.js contains in
>> > its members section:
>> > [CODE]
>> >
>> > members : {
>> >
>> > buildGUI : function () {
>> >
>> > if(hbtables.Application.messageBus.checkSubscription("CONFIG LOADED"));
>> >
>> > qx.event.message.Bus.unsubscribe("CONFIG_LOADED",this.buildGUI,this);
>> > }
>> > main : function () {
>> >
>> > hbtables.Application.messageBus =
>> > qx.event.message.Bus.getInstance();
>> > hbtables.Application.messageBus.subscribe("CONFIG LOADED",
>> > this.buildGUI,this);
>> > }
>> >
>> > }
>> > [/CODE]
>> >
>> > This does not work. Checking the output of
>> >
>> > [CODE]
>> > qx.dev.Debug.debugObject(hbtables.Application.messageBus.getSubscriptions());
>> > [/CODE]
>> >
>> > later in the source shows that the function is still in the subscriber's
>> > list - to be precise, I seem to get the whole document source in the
>> > output of the debugObject above, which irritates me. Is this the correct
>> > behavior?
>> >
>> > Furthermore, the api documentation says about
>> > qx.event.message.Bus.unsubscribe:
>> >
>> > "unsubscribe a listening method _if_ you supply the callback function
>> > and execution context, remove only this exact subscription _otherwise_
>> > remove all subscriptions"
>> >
>> > This, I think, suggests that the second and third parameter are
>> > optional. However, I'm not a native speaker.
>> >
>> > Greets,
>> > Michael
>> >
>> > Gene Amtower schrieb:
>> >
>> >> Michael,
>> >>
>> >> In my API docs, it lists 3 parameters for the Bus.subscribe and
>> >> Bus.unsubscribe methods...
>> >>
>> >> *subscribe(String **message**, Function **subscriber**, Object
>> >> **context**)*
>> >> *unsubscribe(String **message**, Function **subscriber**, Object
>> >> **context**)*
>> >>
>> >> where the 3rd parameter is probably going to be "this" and appears to
>> >> be required per the API docs.
>> >>
>> >> When I used all three parameters in my Playground for both subscribe
>> >> and unsubscribe, the error went away and both the subscibe and
>> >> unsubscribe work correctly. I moved the dispatch statement around to
>> >> test the functionality, and it only worked when placed between the
>> >> subscribe and unsubscribe calls.
>> >>
>> >>
>> >>
>> >>> var messageBus = qx.event.message.Bus.getInstance();
>> >>>
>> >>> var message = new qx.event.message.Message("TEST");
>> >>>
>> >>>
>> >>>
>> >>> var myfunction = function() {
>> >>>
>> >>> alert("Here I am");
>> >>>
>> >>> }
>> >>>
>> >>>
>> >>>
>> >>> messageBus.subscribe("TEST", myfunction, this);
>> >>>
>> >>> // messageBus.unsubscribe("TEST");
>> >>> messageBus.unsubscribe("TEST", myfunction, this);
>> >>>
>> >>> messageBus.dispatch(message);
>> >>>
>> >>>
>> >> HTH,
>> >>
>> >> Gene
>> >>
>> >>
>> >> On Wed, 2009-06-10 at 20:11 +0200, Michael Helwig wrote:
>> >>
>> >>> Hi,
>> >>>
>> >>> how can I unsubscribe a function from a message bus
>> >>> (qx.event.message.Bus)?
>> >>>
>> >>> Calling messageBus.unsubscribe("MESSAGE_TEXT") yields an error
>> >>> ("sub[msgName] is null")
>> >>> Running the following in the Playground app also yields an error:
>> >>>
>> >>> [CODE]
>> >>> var messageBus = qx.event.message.Bus.getInstance();
>> >>> var message = new qx.event.message.Message("TEST");
>> >>>
>> >>> var myfunction = function() {
>> >>> alert("Here I am");
>> >>> }
>> >>>
>> >>> messageBus.subscribe("TEST", myfunction);
>> >>> messageBus.unsubscribe("TEST");
>> >>> [/CODE]
>> >>>
>> >>> Error:
>> >>> playground.Application[p]: TypeError: k[l] is null
>> >>>
>> >>> The combinations
>> >>> [CODE]
>> >>> messageBus.unsubscribe("TEST", myfunction);
>> >>> //OR
>> >>> messageBus.unsubscribe(myfunction);
>> >>> [/CODE]
>> >>> have no effect, the function gets called if the message is dispatched
>> >>> anyway.
>> >>>
>> >>> Am I doing something wrong or is this a bug?
>> >>>
>> >>> Greetings,
>> >>>
>> >>> Michael
>> >>>
>> >>>
>> >>> ------------------------------------------------------------------------------
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>> >> Check out the new simplified licensing option that enables unlimited
>> >> royalty-free distribution of the report engine for externally facing
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>> >
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>> > Check out the new simplified licensing option that enables unlimited
>> > royalty-free distribution of the report engine for externally facing
>> > server and web deployment.
>> > http://p.sf.net/sfu/businessobjects
>> > _______________________________________________
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>>
>>
>> ------------------------------------------------------------------------------
>> Crystal Reports - New Free Runtime and 30 Day Trial
>> Check out the new simplified licensing option that enables unlimited
>> royalty-free distribution of the report engine for externally facing
>> server and web deployment.
>> http://p.sf.net/sfu/businessobjects
>> _______________________________________________
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> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> Crystal Reports - New Free Runtime and 30 Day Trial
> Check out the new simplified licensing option that enables unlimited
> royalty-free distribution of the report engine for externally facing
> server and web deployment.
> http://p.sf.net/sfu/businessobjects
> ------------------------------------------------------------------------
>
> _______________________________________________
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Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
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