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How do I set what "this" refers to?
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Glidos  
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 More options May 2 2012, 11:58 am
From: Glidos <goo...@glidos.net>
Date: Wed, 2 May 2012 08:58:33 -0700 (PDT)
Local: Wed, May 2 2012 11:58 am
Subject: How do I set what "this" refers to?
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I need to run scripts that use a convention of "this" refering to a
specific, otherwise-unnamed object. Is there a way to make v8 handle
that convention?

So far the only work-around I can think of is to provide the global
template with an explicit property to refer to the object
(implicitThisObj say). Then I'd alter the incoming  <script-text> to
be

implicitThisObj.tempFunc = function() { <script-text> };
implicitThisObj.tempFunc();

but that's a bit messy. Anyone know a better way?

Cheers,
   Paul.


 
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Andreas Rossberg  
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 More options May 2 2012, 12:07 pm
From: Andreas Rossberg <rossb...@google.com>
Date: Wed, 2 May 2012 18:07:52 +0200
Local: Wed, May 2 2012 12:07 pm
Subject: Re: [v8-users] How do I set what "this" refers to?
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On 2 May 2012 17:58, Glidos <goo...@glidos.net> wrote:

> I need to run scripts that use a convention of "this" refering to a
> specific, otherwise-unnamed object. Is there a way to make v8 handle
> that convention?

> So far the only work-around I can think of is to provide the global
> template with an explicit property to refer to the object
> (implicitThisObj say). Then I'd alter the incoming  <script-text> to
> be

> implicitThisObj.tempFunc = function() { <script-text> };
> implicitThisObj.tempFunc();

> but that's a bit messy. Anyone know a better way?

Rewrite to:

(function() { <script-text> }).call(implicitThisObj)

That's the easiest way. The global object is quite special, and cannot
just be replaced it with a random object.

/Andreas


 
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Stephan Beal  
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 More options May 2 2012, 1:07 pm
From: Stephan Beal <sgb...@googlemail.com>
Date: Wed, 2 May 2012 19:07:13 +0200
Local: Wed, May 2 2012 1:07 pm
Subject: Re: [v8-users] How do I set what "this" refers to?
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On Wed, May 2, 2012 at 6:07 PM, Andreas Rossberg <rossb...@google.com>wrote:

> (function() { <script-text> }).call(implicitThisObj)

See also Function.apply(). The only difference between apply() and call()
is how the 2nd+ argument(s) are passed to it:

myFunc.call( myObj, 1, 2 );
===
myFunc.apply( myObj, [1, 2] );

--
----- stephan beal
http://wanderinghorse.net/home/stephan/
http://gplus.to/sgbeal


 
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Glidos  
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 More options May 2 2012, 6:13 pm
From: Glidos <goo...@glidos.net>
Date: Wed, 2 May 2012 15:13:17 -0700 (PDT)
Local: Wed, May 2 2012 6:13 pm
Subject: Re: How do I set what "this" refers to?
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Thanks. Both apply and call are improvements over my attempt, but
maybe I don't need any tricks:
if I just get v8 to execute <script-text> directly, will "this" refer
to the global object?

 
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Ruben Rodriguez  
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 More options May 2 2012, 6:30 pm
From: Ruben Rodriguez <rubentb...@gmail.com>
Date: Wed, 2 May 2012 17:30:20 -0500
Local: Wed, May 2 2012 6:30 pm
Subject: Re: [v8-users] Re: How do I set what "this" refers to?
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Yes. The global object of the context within which you execute the script.

from my hacked android ;)
On May 2, 2012 5:13 PM, "Glidos" <goo...@glidos.net> wrote:


 
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Glidos  
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 More options May 9 2012, 10:02 am
From: Glidos <goo...@glidos.net>
Date: Wed, 9 May 2012 07:02:56 -0700 (PDT)
Local: Wed, May 9 2012 10:02 am
Subject: Re: How do I set what "this" refers to?
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Brilliant. That all works now. Thanks for the help.

On May 2, 11:30 pm, Ruben Rodriguez <rubentb...@gmail.com> wrote:


 
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