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Message-ID: <2061545.QaVc4i2NtW@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Sat, 13 Apr 2013 11:45:24 +0200
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Subject: Re: trying to call onclick with document.getElement() - document.getElement() returns null
Newsgroups: comp.lang.javascript
References: <17650677-77bd-4bca-8e10-ed45772f2e9f@googlegroups.com> <87fvyv1r7q.fsf@gmail.com> <7902669.URqpOMyR7R@PointedEars.de> <kkb7dq$ggn$1@portraits.wsisiz.edu.pl>
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Cezary Tomczyk wrote:

> W dniu 2013-04-13 10:29, Thomas 'PointedEars' Lahn pisze:
>> Mikael Andersson wrote:
> [...]
>>>>          if (window.XMLHttpRequest) {
>>
>> Insufficient and error-prone, see isHostMethod().
> [...]
> 
> Just our of curiosity: in which environment / scenario this will not be
> properly evaluated?

Where “XMLHttpRequest” is not a property of the object referred to by 
“window”, but of another object in the scope chain.

Where the host object referred to by “window.XMLHttpRequest” does not take 
kindly (read: throws unrecoverable exceptions) on being subjected to a
type-converting test.

See previous discussions that lead to isHostMethod().

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.