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Message-ID: <1506321.WIFe3XHvss@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Wed, 26 Jun 2013 02:39:27 +0200
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Subject: Re: How can javascript detect a fieldset in an array of elements
Newsgroups: comp.lang.javascript
References: <379ks8thdutnrglv34mc63mr95kgbglopo@4ax.com> <2529079.e95EOKG17B@PointedEars.de>
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Thomas 'PointedEars' Lahn wrote:

> The reason of the error is most likely not that there is a “fieldset”
> element, but that there are several controls that have the same name.  For
> example, it is common to put a radiobutton group into a “fieldset”
> element. All radiobuttons of a group must have the same name to be
> dependent on one another.
> 
> In that case,
> 
>   elements[i]
> 
> refers to a NodeList of references to those controls.

But that probably does not apply here.  It applies when you access controls 
by name instead of by index.

> An object implementing the NodeList interface does not have a “type”
> property.  As the property does not exist, accessing it results in
> “undefined”, and “undefined” has no properties.
> 
> You can use the fact above to your advantage to find out whether there is
> a group of same-named controls that need to be processed differently:
> 
>   var control = elements[i];
>   if (typeof control.type == "undefined")
>   {

But the second part of the explanation should apply and this approach should 
work regardless.

-- 
PointedEars

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