Thank you very much for responding that fast and clear. In fact you
are right, I misinterpreted the usage.
Thanks to you, this file is closed now ;)

On 7 Aug., 10:51, "T.J. Crowder" <t...@crowdersoftware.com> wrote:
> Hi,
>
> > When I change the line into "new PeriodicalExecuter
> > (myobject.unknownMethod(), 3);", firebug at once states correctly that
> > this function doesn't exist, which is right.
>
> And if it did exist, it would execute once, immediately, and the
> PeriodicalExecuter would fail three seconds later.  This line of code:
>
> new PeriodicalExecuter(obj.method(), 3);
>
> ...like any other function call runs obj.method _immediately_ and
> passes the return value of the method into the PeriodicalExecuter
> constructor.  Unless the method returns a function reference, that's
> not going to work.
>
> You probably want to do this:
>
> new PeriodicalExecuter(obj.method.bind(obj), 3);
>
> Note that we are *not* calling method here; we're calling bind and
> telling it to return a function that, when called, will call
> obj.method.
>
> If you're not using an object method, just a function, you don't need
> bind:
>
> new PeriodicalExecuter(someFunction, 3);
>
> Note, again, that we are not *calling* someFunction there (there are
> no parens after it), we're just passing a reference to it into the
> constructor.
>
> [1]http://prototypejs.org/api/periodicalExecuter
> [2]http://prototypejs.org/api/function/bind
>
> HTH,
> --
> T.J. Crowder
> tj / crowder software / com
> Independent Software Engineer, consulting services available
>
> On Aug 7, 1:30 am, Schweitzer <lul...@gmx.de> wrote:
>
> > Hi there!
>
> > Got an error with Prototypes PeriodicalExecuter() (Version 1.6.0.3):
> > When I use the "verified" (http://www.prototypejs.org/api/
> > periodicalExecuter) "new PeriodicalExecuter(myobject.testMethod(),
> > 3);", everything seems fine (no error in Firebug etc) but after 3
> > Seconds an error "this.callback is not a function [...]/prototype.js
> > Line 308" appears. testMethod was not started.
>
> > The line "new PeriodicalExecuter(function() { alert("test"); }, 3);"
> > works when written instead.
>
> > When I change the line into "new PeriodicalExecuter
> > (myobject.unknownMethod(), 3);", firebug at once states correctly that
> > this function doesn't exist, which is right.
>
> > Now I wonder about why this error appears. As you may imagine,
> > testMethod() is part of an Object, but the error appears outside as
> > inside the initialize()-function of the "Class" created by Class.create
> > (). Even outside the "class". The used testMethod() seems to exist
> > nonetheless.
>
> > I would like to read any hint or maybe solution to this problem,
> > please feel free to ask for more information, too.
>
> > Schweitzer
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