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Re: intercept an alert

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Stefan Ram wrote:

> "Evertjan." <exxjxw.hannivoort@inter.nl.net> writes:
>> Simon Lewis […] wrote […]:
>>> People tag things on to "window" in each and every JS project.
>> You cannot know my JS projects, nor that of my neighbours,
>> so such utterances make your js-credulity go below 1% here.
> 
>   When one just defines a global function (which happens
>   often) or variable, it becomes a property of the windows
>   object.

You meant _window_, and no.  It becomes a property of the ECMAScript global 
object with the attribute [[DontDelete]] (ES3) or lacking the [[Writable]] 
attribute (ES5.1+); see ES 5.1, §§10.2.3 and 10.4.1 [0].  Anything more 
depends on the runtime environment and is not reliable (cross-frame 
referencing excluded).

The ECMAScript global object can be referred to in the global execution 
context with “this” because it is its /this/ value.  Since there is no other 
standards-compliant way, particularly not a built-in property, to refer to 
the global object (yet) (returning the “this” value from an instantly called 
anonymous function does not work in strict mode), it is recommended to 
define a variable or property that can be used instead.  For example:

  var _global = this;

JSX provides “jsx.global” since several revisions in order to avoid another 
global variable. [1]  (The main compatibility layer, JSX:compat.js, can 
still provide the old “_global” if needed. [2])  Of course, in properly 
structured code it is only seldom necessary to refer to the global object 
from local context in the first place.

____________
[0] <http://ecma-international.org/ecma-262/5.1/#sec-10.2.3>
    <http://ecma-international.org/ecma-262/5.1/#sec-10.4.1>
[1] <http://PointedEars.de/wsvn/JSX/trunk/object.js>
[2] <http://PointedEars.de/wsvn/JSX/trunk/compat.js>
-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
Please do not Cc: me. / Bitte keine Kopien per E-Mail.

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intercept an alert Andrew Poulos <ap_prog@hotmail.com> - 2014-05-12 14:38 +1000
  Re: intercept an alert Andrew Poulos <ap_prog@hotmail.com> - 2014-05-12 15:35 +1000
    Re: intercept an alert Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-12 11:32 +0200
      Re: intercept an alert Simon Lewis <simonlewis2001@gmail.com> - 2014-05-12 12:29 +0200
        Re: intercept an alert Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-12 13:30 +0200
        Re: intercept an alert "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-05-12 14:54 +0200
          Re: intercept an alert "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-05-12 15:36 +0200
            Re: intercept an alert Simon Lewis <simonlewis2001@gmail.com> - 2014-05-12 15:40 +0200
              Re: intercept an alert Simon Lewis <simonlewis2001@gmail.com> - 2014-05-12 15:43 +0200
                Re: intercept an alert "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-05-12 16:19 +0200
          Re: intercept an alert Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-12 19:35 +0200
    Re: intercept an alert garrett.smith@acxiom.com - 2014-05-14 09:57 -0700
  Re: intercept an alert Dr J R Stockton <reply1400@merlyn.demon.co.uk.invalid> - 2014-05-13 18:00 +0100
  Re: intercept an alert garrett.smith@acxiom.com - 2014-05-14 09:57 -0700

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