self['@name']

Richard Eng wrote:

> I have an app with the following class:
>
> ||
> Objectsubclass:#Stressrelief
>  instanceVariableNames:'mySound currentTrack tracks mute cursor images
> scheduled'
> package:'Stressrelief'
>
> I'm trying to access mySound from within JavaScript. Just to verify
> access, I pop up an alert:
>
> ||
> alert('mySound is '+self['@mySound']);

Well, this seems to be ok. Not to mentioned the error message "mySound is undefined" refers to 'mySound'. not '@mySound'. Is it the error message regarding that alert? Is that alert in the JS type method (there is no online JS inside ST any more, for maybe three years - inline JS only work in dedicated JS method.

Or is it that you have:

<inlineJS: ' alert('mySound is '+self['@mySound']);'>

In which case the apostrophe ends the string, thus it does not fit into parse rule for new inlineJS, so it represents it as legacy JS statement of:

  inlineJS: 'alert'; // inlineJS in JS label
  mySound; // here it should have blow
n with 'ReferenceError: mySound is undefined'
  is;
  '+ self';
  @mySound; // well, this is really strange in JS and would blow but did not get there
  ']);';

Seems likely. The inlineJS: '....' needs '....' to be proper Smalltalk string and nothing else should be present there. So either using two apostrophes to escape it or use quote.

>
> Everywhere in my code, it tells me that "mySound is undefined". What
> have I missed from this document, "From smalltalk to javascript and
> back
> <<a href="https://github.com/amber-smalltalk/amber/wiki/From-smalltalk-to-javascript-and-back" target="_blank" rel="nofollow" onmousedown="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Famber-smalltalk%2Famber%2Fwiki%2FFrom-smalltalk-to-javascript-and-back\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFEoAvzKjJ20Ozb5129ypzW2j5ZSw&#39;;return true;" onclick="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Famber-smalltalk%2Famber%2Fwiki%2FFrom-smalltalk-to-javascript-and-back\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFEoAvzKjJ20Ozb5129ypzW2j5ZSw&#39;;return true;">https://github.com/amber-smalltalk/amber/wiki/From-smalltalk-to-javascript-and-back>"?
>
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Richard Eng wrote:
> I have a separate JS file containing special routines I need: <script
> type="text/javascript" src="js/index.js"></script>

Well, then you do something wrong. How do you want to use 'self' outside
of the method?

>
>
> On Monday, 21 November 2016 15:03:51 UTC-5, Herby wrote:
>
>     Richard Eng wrote:
>      > I have an app with the following class:
>      >
>      > ||
>      > Objectsubclass:#Stressrelief
>      >  instanceVariableNames:'mySound currentTrack tracks mute cursor
>     images
>      > scheduled'
>      > package:'Stressrelief'
>      >
>      > I'm trying to access mySound from within JavaScript. Just to verify
>      > access, I pop up an alert:
>      >
>      > ||
>      > alert('mySound is '+self['@mySound']);
>
>     Well, this seems to be ok. Not to mentioned the error message
>     "mySound is undefined" refers to 'mySound'. not '@mySound'. Is it
>     the error message regarding that alert? Is that alert in the JS type
>     method (there is no online JS inside ST any more, for maybe three
>     years - inline JS only work in dedicated JS method.
>
>     Or is it that you have:
>
>     <inlineJS: ' alert('mySound is '+self['@mySound']);'>
>
>     In which case the apostrophe ends the string, thus it does not fit
>     into parse rule for new inlineJS, so it represents it as legacy JS
>     statement of:
>
>        inlineJS: 'alert'; // inlineJS in JS label
>        mySound; // here it should have blow
>     n with 'ReferenceError: mySound is undefined'
>        is;
>     '+ self';
>        @mySound; // well, this is really strange in JS and would blow
>     but did not get there
>     ']);';
>
>     Seems likely. The inlineJS: '....' needs '....' to be proper
>     Smalltalk string and nothing else should be present there. So either
>     using two apostrophes to escape it or use quote.
>
>      >
>      > Everywhere in my code, it tells me that "mySound is undefined". What
>      > have I missed from this document, "From smalltalk to javascript and
>      > back
>      >
>     <<a href="https://github.com/amber-smalltalk/amber/wiki/From-smalltalk-to-javascript-and-back" target="_blank" rel="nofollow" onmousedown="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Famber-smalltalk%2Famber%2Fwiki%2FFrom-smalltalk-to-javascript-and-back\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFEoAvzKjJ20Ozb5129ypzW2j5ZSw&#39;;return true;" onclick="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Famber-smalltalk%2Famber%2Fwiki%2FFrom-smalltalk-to-javascript-and-back\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFEoAvzKjJ20Ozb5129ypzW2j5ZSw&#39;;return true;">https://github.com/amber-smalltalk/amber/wiki/From-smalltalk-to-javascript-and-back
>     <<a href="https://github.com/amber-smalltalk/amber/wiki/From-smalltalk-to-javascript-and-back" target="_blank" rel="nofollow" onmousedown="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Famber-smalltalk%2Famber%2Fwiki%2FFrom-smalltalk-to-javascript-and-back\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFEoAvzKjJ20Ozb5129ypzW2j5ZSw&#39;;return true;" onclick="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Famber-smalltalk%2Famber%2Fwiki%2FFrom-smalltalk-to-javascript-and-back\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFEoAvzKjJ20Ozb5129ypzW2j5ZSw&#39;;return true;">https://github.com/amber-smalltalk/amber/wiki/From-smalltalk-to-javascript-and-back>>"?
>
>      >
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Richard Eng wrote:
> Okay, that's my problem. I'm trying to access mySound not from a method.
> So there is no way to access it from outside a method?

Well, whoever wrote that JS->ST->JS text just wrote "you use
self['@name']" and the conclusions:

   1. It uses self - so it is what I would use inside the method where
self is known.
   2. It means that Amber objects hold their 'name' ivar in JS property
'@name', so if I have an instance in variable foo, I can do foo['@name'].

are left to the reader.

So, yes, you can. Using conclusion 2.

> I thought I might try calling a Smalltalk method (*doMute*, which
> accesses mySound) from a JS function:
>
> ||
> functionmyFunc(){
> require("amber/helpers").globals.Stressrelief._doMute();
> }

You surely did not presume that when you get the class Stressrelief via
`require("amber/helpers").globals.Stressrelief` and append `._doMute()`
you are calling anything else than the class method doMute of class
Stressrelief.

> But this doesn't appear to work.

And I am sure it works. Maybe you do not have such class method in the
first place (or you do not want to call a class method in fact).

Herby

> On Monday, 21 November 2016 16:41:12 UTC-5, Herby wrote:
>
>     Richard Eng wrote:
>      > I only want to access the *mySound* instance variable. The
>     document says
>      > self['@mySound'] should do the trick. /What can possibly go
>     wrong???/
>
>     Nothing. If you use it in method. How do you want 'self' to be defined
>     otherwise?
>
>      >
>      >
>      > On Monday, 21 November 2016 16:27:16 UTC-5, Herby wrote:
>      >
>      >     Richard Eng wrote:
>      > > I have a separate JS file containing special routines I need:
>      > <script
>      > > type="text/javascript" src="js/index.js"></script>
>
>     And this does not seem to be a method.
>
>     OTOH, if the error message is really 'mySound is undefined', then it
>     must occur somewhere else, not in self['@mySound'].
>
>     Find out where it fails. In compiled JS. And reverse engineer yourself
>     into the cause. From what you described, you are doing things in very
>     strange way (with the <script>). There is no 'self' at all there.
>
>     Herby
>
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