Re: Script work with windows XP, "opera,chrome" but not in Windows 10 something changed in the midi API?

Newsgroups	comp.lang.javascript
Date	2018-05-21 05:21 -0700
References	(1 earlier) <XnsA8E97C6C37AA1eejj99@194.109.6.166> <b86980b5-3681-414c-87c7-3c8a23ef105a@googlegroups.com> <9f7495e2-528f-47c2-86d4-fda88b87bfc9@googlegroups.com> <412057a0-04a2-4bff-aecd-0b5ce38fd86b@googlegroups.com> <b3b3548e-5448-4967-b70e-4cd4a757d6af@googlegroups.com>
Message-ID	<0f4ab2aa-42c8-4384-bcaf-5a26f18df4bd@googlegroups.com> (permalink)
Subject	Re: Script work with windows XP, "opera,chrome" but not in Windows 10 something changed in the midi API?
From	Jonas Thörnvall <jonas.thornvall@gmail.com>

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Den måndag 21 maj 2018 kl. 14:21:26 UTC+2 skrev Jonas Thörnvall:
> Den måndag 21 maj 2018 kl. 14:11:30 UTC+2 skrev Jonas Thörnvall:
> > Den måndag 21 maj 2018 kl. 13:46:28 UTC+2 skrev Jonas Thörnvall:
> > > Den måndag 21 maj 2018 kl. 13:24:29 UTC+2 skrev Jonas Thörnvall:
> > > > Den måndag 21 maj 2018 kl. 12:13:56 UTC+2 skrev Evertjan.:
> > > > > =?UTF-8?Q?Jonas_Th=C3=B6rnvall?= <jonas.thornvall@gmail.com> wrote on 21
> > > > > May 2018 in comp.lang.javascript: 
> > > > > 
> > > > > > I get errors when i run the code that slip thru on XP using windows 10,
> > > > > > it is probably not the same version of browser and javascript API. 
> > > > > > 
> > > > > > TypeError: Cannot read property 'send' of undefined"
> > > > >  
> > > > > > function sendProgram(){
> > > > > >     //Set program on the track
> > > > > >     programC=document.getElementById("prog_sel").value;
> > > > > >     sysexC=192+channelC-1;
> > > > > >     output = mid.outputs.get(outportindex);
> > > > > >     settingChange = [sysexC,programC];
> > > > > >     output.send(settingChange);
> > > > > >}
> > > > > 
> > > > > It means that 'output' is not defined here.
> > > > > 
> > > > > And that is because 'mid' is not defined in this function,
> > > > > wouldn't you say?
> > > > > 
> > > > > 'mid' surely is noty a global value,
> > > > > as it is defined in another not-parenting function.
> > > > 
> > > > By the way what do you mean by not parenting function?
> > > > 
> > > > I try to understand could i use window.mid?
> > > > 
> > > > https://developer.mozilla.org/en-US/docs/Glossary/Global_object
> > > > 
> > > > 
> > > > 
> > > > > 
> > > > > ==============
> > > > > 
> > > > > Get into the habit of using 'let' and 'const'
> > > > > in your code using 'use strict',
> > > > > and hopefully you get earlier warning of such errors.
> > > > > 
> > > > > btw, why do you programme on an XP machine,
> > > > > when W10 is within your reach?
> > > > > 
> > > > > Do you cut your firewood with a stone ax?
> > > > > 
> > > > > 
> > > > > -- 
> > > > > Evertjan.
> > > > > The Netherlands.
> > > > > (Please change the x'es to dots in my emailaddress)
> > > 
> > > In short if anyone can show me howto access the midi object that i copied into mid from other functions, it would be nice.
> > 
> > I think i can see where this is going do i really have 
> > A(midi){B(midi){C(midi){D(midi)}}}}
> > 
> > If so who come up with that to be better then a global variable?
> 
> No that strategy did not work either, should it?
> How can i reach either my copied mid or the original midi object from other functions, further down in the function hierarchy see above?

Why does it work in XP?

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