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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Using getElementsByName on a DIV ?
Supersedes: <1945521.Ox6yzQtThg@PointedEars.de>
Date: Thu, 05 May 2016 00:46:21 +0200
Organization: PointedEars Software (PES)
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Message-ID: <5472957.EtlMkCADSI@PointedEars.de>
References: <571e5590$0$5835$e4fe514c@news.xs4all.nl> <getElementsByTagName-20160425193302@ram.dialup.fu-berlin.de> <571e6847$0$5912$e4fe514c@news.xs4all.nl> <8760v5a4ic.fsf@bsb.me.uk> <571e72f0$0$5941$e4fe514c@news.xs4all.nl> <87zish8hqk.fsf@bsb.me.uk> <571f1936$1$5824$e4fe514c@news.xs4all.nl> <87d1pc8xzs.fsf@bsb.me.uk> <571f6433$0$5816$e4fe514c@news.xs4all.nl> <877ffk8p59.fsf@bsb.me.uk> <571f9907$0$5862$e4fe514c@news.xs4all.nl> <87shy86wo0.fsf@bsb.me.uk> <571fc489$1$5825$e4fe514c@news.xs4all.nl> <87a8kg6jz8.fsf@bsb.me.uk> <572080a7$0$5941$e4fe514c@news.xs4all.nl> <877ffi619z.fsf@bsb.me.uk>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
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Ben Bacarisse wrote:

> "R.Wieser" <address@not.available> writes:
   ^^         ^^^^^^^^^^^^^^^^^^^^^
WTF is this?  YTF are you people even talking to this guy?

> <snip>
>> Do I *really* need to spoon-feed the/a problem like in the below ?
> 
> No, you really have to provide an example document along with the code
> that doesn't work.
> 
>> [javascript]
>> Ancestor = this.parentNode;
>> aDescendants = Ancestor.getElementsByTagName("IMG");
>> // aDescendants = Ancestor.getElementsByName("foobar");
>> // aDescendants = Ancestor.getElementsByClassName("foobar");
>> // oDescendant = Ancestor.getElementByID("foobar");
                             ^^^^^^^^^^^^^^
>> [/javascript]
>>
>> I thought that should have been clear from my problem description.   But
>> I guess I expected too much ...

Enough niceties extended to the OP.  It takes a sharp axe to split a tough 
log¹:

This is not a free customer support forum; you are not a customer, and we 
are not the customer support team that needs to cater to your every whim in 
order to avoid losing you.  This is a technical newsgroup on software 
development for (aspiring) software developers.  Do your own homework and 
RTFFAQ, RTFM, STFW.  Or FOAD, luser.

> […]
> One thing is sure: if aDescendants is an element (as seems likely, but
> without a full example that's just a guess) the calls to
> getElementsByName and to getElementByID won't work.  These are methods
> that are part of the document interface, not the element interface.

getElementsByName() is a method of the *Document* (HTML5+) and 
*HTMLDocument* (W3C DOM Level 2 HTML, for [X]HTML < 5) interfaces only.

<http://www.w3.org/TR/2014/REC-html5-20141028/dom.html#the-document-object>

<http://www.w3.org/TR/2003/REC-DOM-Level-2-HTML-20030109/html.html#ID-26809268>
<http://www.w3.org/TR/2003/REC-DOM-Level-2-HTML-20030109/html.html#ID-011100101>
<https://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-745549614>
<https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#ID-745549614>

There is no getElementByID() method in the W3C DOM, which is probably the 
reason why the call fails.  getElementById(), however (note the letter 
case), is and has always been a method of the *Document* interface.

<https://www.w3.org/TR/2015/REC-dom-20151119/#interface-nonelementparentnode>

<https://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#i-Document>
<https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#i-Document>

  [“Note: The getElementById() method is not on elements for compatibility 
   with older versions of jQuery. …” – WTF?]

___________
¹  Thanks to the people at dict.leo.org for the approximate translation of 
   the German original, „Auf einen groben Klotz gehört ein grober Keil“.
-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
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