Re: How to feature test for window.ActiveXObject?

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Message-ID	<1523422.xR7oMBUoa9@PointedEars.de> (permalink)
From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To	Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
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Date	Fri, 22 Nov 2013 15:51:29 +0100
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Subject	Re: How to feature test for window.ActiveXObject?
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Michael Haufe (TNO) wrote:

> Thomas 'PointedEars' Lahn wrote:
>> However, I do not see how that could be be used to detect support for a
>> certain COM class.  The element is there no matter whether the class is
>> supported.
> 
> While the element will exist, if you inspect the variables, you'll noticed
> they are augmented with the members of the COM object if it loaded
> properly:
> 
> wmv.cdromcollection
> 
> xhr.responseBody

ACK.

>> Besides, does there have to be a CLSID for each server type?
> 
> I believe you can use progids as well, but IME this is pretty unreliable.

AFAIK you have to use ProgIDs ("server.type") when calling ActiveXObject, 
and:

,-<http://msdn.microsoft.com/en-us/library/aa911706.aspx‎>
| 
| A programmatic identifier (ProgID) is a registry entry that can be
| associated with a CLSID.

“Can”, not “must”/“are”.

>> What about non-HTML use?
> 
> I don't understand what you're referring to exactly, but there is
> basically a similar mechanism in WSH and classic ASP.

Current libraries using ActiveXObject do not have to have elements in HTML 
documents in order to do XHR, for example.  And if elements are created on 
the fly for the test, there is both another DOM dependency and a race 
condition.

-- 
PointedEars

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

Thread

How to feature test for window.ActiveXObject? Christoph Michael Becker <cmbecker69@arcor.de> - 2013-11-16 20:24 +0100
  Re: How to feature test for window.ActiveXObject? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-17 00:08 +0100
    Re: How to feature test for window.ActiveXObject? Christoph Michael Becker <cmbecker69@arcor.de> - 2013-11-18 13:25 +0100
      Re: How to feature test for window.ActiveXObject? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-18 18:52 +0100
        Re: How to feature test for window.ActiveXObject? Christoph Michael Becker <cmbecker69@arcor.de> - 2013-11-21 23:44 +0100
          Re: How to feature test for window.ActiveXObject? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-22 00:32 +0100
      Re: How to feature test for window.ActiveXObject? Martin Honnen <mahotrash@yahoo.de> - 2013-11-18 19:29 +0100
        Re: How to feature test for window.ActiveXObject? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-18 19:35 +0100
    Re: How to feature test for window.ActiveXObject? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2013-11-21 19:13 -0800
      Re: How to feature test for window.ActiveXObject? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-22 11:56 +0100
        Re: How to feature test for window.ActiveXObject? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2013-11-22 06:33 -0800
          Re: How to feature test for window.ActiveXObject? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-22 15:51 +0100
            Re: How to feature test for window.ActiveXObject? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2013-11-22 07:44 -0800
  Re: How to feature test for window.ActiveXObject? JJ <duh@nah.meh> - 2013-11-17 07:27 +0700
    Re: How to feature test for window.ActiveXObject? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2013-11-21 18:38 -0800

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