Re: Class with internal callback referencing itself.

Path	csiph.com!optima2.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!newsfeed.fsmpi.rwth-aachen.de!newsfeed.straub-nv.de!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail
From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.javascript
Subject	Re: Class with internal callback referencing itself.
Date	Wed, 29 Jul 2015 10:49:45 +0100
Organization	A noiseless patient Spider
Lines	28
Message-ID	<87mvyf5m4m.fsf@bsb.me.uk> (permalink)
References	<f7ab5abb-4bbc-4e22-9b5d-dc347d500f82@googlegroups.com>
Mime-Version	1.0
Content-Type	text/plain
Injection-Info	mx02.eternal-september.org; posting-host="017616aa25f81ec581c44d76d61ba2f3"; logging-data="8115"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+a3eniHBPXpH+GGtAF1KcGmD39iMgjpos="
Cancel-Lock	sha1:7ZF08pVRsiGAyNpzi+BLJOWGlJU= sha1:N0a7X2Mcmy1g0r3mTxUsQb3lDNk=
X-BSB-Auth	1.df83f2832bee404a914e.20150729104945BST.87mvyf5m4m.fsf@bsb.me.uk
Xref	csiph.com comp.lang.javascript:28478

Show key headers only | View raw

puritanpaul@gmail.com writes:

> Can someone offer a way around this problem?
>
> MyClass.prototype.selectClinic = function() { 
> 	this.otherClass.doSomething( this.selectClinicSuccess );
> }
>
> MyClass.prototype.selectClinicSuccess = function() { 
> 	this.getProperty()
> }
>
> MyClass.prototype.getProperty = function() { 
> // do some stuff
> }
>
> When I land in selectClinicSuccess, I'm getting this.getProperty is
> not a function.

You don't show enough code to be sure, but passing
this.selectClinicSuccess to doSomething is almost certainly wrong.
doSomething probably call calls its argument, in which case 'this' will
be undefined inside selectClinicSuccess.  You might want

  this.otherClass.doSomething( this.selectClinicSuccess.bind(this) );

-- 
Ben.

Thread

Class with internal callback referencing itself. puritanpaul@gmail.com - 2015-07-29 00:50 -0700
  Re: Class with internal callback referencing itself. "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2015-07-29 10:13 +0200
  Re: Class with internal callback referencing itself. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-07-29 10:49 +0100
    Re: Class with internal callback referencing itself. Jonathan Price <puritanpaul@gmail.com> - 2015-07-29 11:48 -0700

csiph-web