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Message-ID: <3001757.SPkdTlGXAF@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 17 Nov 2011 21:06:51 +0100
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Subject: Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions
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Eric Bednarz wrote:

> Thomas 'PointedEars' Lahn <PointedEars@web.de> writes:
>> This is actually one case where property inference (window.opera) is
>> useful and acceptable; […]
> 
> var opera = 'Der Ring des Nibelungen';

Don't be ridiculous.  Oh wait, it's you.

> On the other hand, Opera has a proper way of dealing with
> (version-)detection (unless the opera object is shadowed, and I’d rather
> have a false negative than a false positive; but surely YMWD), e.g.:
> 
> var OPERA = (function (global) {
>     var dom_window = global.window,

AISB.

>         opera,
>         version,
>         subversion,
>         build;
>     if ('object' == typeof dom_window.opera) {

You have overlooked the case of dom_window.opera === null.  Also, it is a 
host object, so all bets (other than it would have to be a true-value to be 
useful) are off.

>         opera = dom_window.opera;
>         // the version method was introduced in Opera 8
>         if (('function' == typeof opera.version) &&
>             ('function' == typeof opera.buildNumber)

You have overlooked the case where a host object's method would not yield 
`function', which might be the case with Opera's DOM implementation.


PointedEars
-- 
When all you know is jQuery, every problem looks $(olvable).