Re: Using getElementsByName on a DIV ?

Newsgroups	comp.lang.javascript
Subject	Re: Using getElementsByName on a DIV ?
From	"Evertjan." <exxjxw.hannivoort@inter.nl.net>
References	<571e5590$0$5835$e4fe514c@news.xs4all.nl> <JpqLf9bYw+HXFw8E@invalid.uk.co.demon.merlyn.invalid>
Date	2016-04-27 10:34 +0200
Message-ID	<XnsA5F76BA273933eejj99@194.109.6.166> (permalink)

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Dr J R Stockton <reply1600@merlyn.demon.co.uk.invalid> wrote on 27 Apr 2016 
in comp.lang.javascript:

> In comp.lang.javascript message <571e5590$0$5835$e4fe514c@news.xs4all.nl
>>, Mon, 25 Apr 2016 19:37:21, R.Wieser <address@not.available> posted:
> 
>>Now I think of it, I've got pretty-much the same question in regard to
>>finding an "ancestor" element:  I've written some code which moves up the
>>DOM tree until it finds the sought for element, but maybe there is a
>>simpler, single command available for that too.
> 
> One should consider how often, and how quickly, this needs to be done.
> 
> If it is only needed a few times, and the DOM tree is not vast, you
> might as well just scan the whole DOM tree on every occasion until the
> desired point is found.
> 
> If it is to be done sufficiently frequently on an unchanging tree, it
> seems to me likely that it would be worth-while to scan the whole DOM
> tree initially, building a parallel tree or list or array containing
> only the elements which might be wanted; and scan only that when an
> element is wanted.

You are absolutely right, John.

However, perhaps 'we' sometimes forget that to the younger ones,
programme-efficiency is not so much factual execution efficiency 
as imagined programming ease. 

The whole JQuery worship is based on such fallacy.

-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

Thread

Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-25 19:37 +0200
  Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-25 20:57 +0200
    Re: Using getElementsByName on a DIV ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-04-25 20:10 +0100
      Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-25 21:42 +0200
        Re: Using getElementsByName on a DIV ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-04-25 23:07 +0100
          Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 09:32 +0200
            Re: Using getElementsByName on a DIV ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-04-26 11:28 +0100
              Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 14:52 +0200
                Re: Using getElementsByName on a DIV ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-04-26 14:40 +0100
                Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 18:37 +0200
                Re: Using getElementsByName on a DIV ? "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-04-26 19:12 +0200
                Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 20:44 +0200
                Re: Using getElementsByName on a DIV ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-04-26 19:17 +0200
                Re: Using getElementsByName on a DIV ? Stefan Weiss <krewecherl@gmail.com> - 2016-04-26 19:56 +0200
                Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 22:11 +0200
                Re: Using getElementsByName on a DIV ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-04-26 19:40 +0100
                Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 21:43 +0200
                Re: Using getElementsByName on a DIV ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-04-27 00:14 +0100
                Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-27 11:05 +0200
                Re: Using getElementsByName on a DIV ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-04-28 01:10 +0100
                Re: Using getElementsByName on a DIV ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-05-05 00:46 +0200
                Re: Using getElementsByName on a DIV ? "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-05-06 12:56 +0200
                Re: Using getElementsByName on a DIV ? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-05-06 05:14 -0700
                Re: Using getElementsByName on a DIV ? John Harris <niam@jghnorth.org.uk.invalid> - 2016-05-05 14:36 +0100
                Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 20:38 +0200
        Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 08:57 +0200
  Re: Using getElementsByName on a DIV ? Stefan Weiss <krewecherl@gmail.com> - 2016-04-25 23:41 +0200
    Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 08:59 +0200
  Re: Using getElementsByName on a DIV ? JJ <jj4public@vfemail.net> - 2016-04-26 19:03 +0700
    Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-26 14:56 +0200
    Re: Using getElementsByName on a DIV ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-04-26 20:13 +0200
      Re: Using getElementsByName on a DIV ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-04-26 20:19 +0200
  Re: Using getElementsByName on a DIV ? Dr J R Stockton <reply1600@merlyn.demon.co.uk.invalid> - 2016-04-26 23:30 +0100
    Re: Using getElementsByName on a DIV ? "R.Wieser" <address@not.available> - 2016-04-27 09:29 +0200
    Re: Using getElementsByName on a DIV ? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-04-27 10:34 +0200
    Re: Using getElementsByName on a DIV ? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-05-04 19:04 -0700

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