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Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions

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Message-ID <1669332.aK4W3vaeNJ@PointedEars.de> (permalink)
From Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization PointedEars Software (PES)
Date Mon, 14 Nov 2011 15:40:11 +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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J.R. wrote:

> On 14/11/2011 09:40, Thomas 'PointedEars' Lahn wrote:
>> J.R. wrote:
>>> Thomas 'PointedEars' Lahn wrote:
>>>> J.R. wrote:
>>>>> Thomas 'PointedEars' Lahn wrote:
>>>>>> J.R. wrote:
>>>>>>> On 10/11/2011 12:09, David Mark wrote:
>>>>>>>> if (document.documentElement&&     typeof
>>>>>>>> document.documentElement.clientWidth == 'number') {
>>>>>>>>       var getInnerDimensions = function(el) {
>>>>>>>>         return [el.clientHeight, el.clientWidth];
>>>>>>>>       };
>>>>>>>> }
>>>>>>>
>>>>>>> Considering an element having scrollbars, we might use:
>>>>>>>
>>>>>>>       return [el.scrollTop + el.clientHeight,
>>>>>>>               el.scrollLeft + el.clientWidth];
>>>>>>
>>>>>> Please explain what the scroll position has to do with the element
>>>>>> dimensions.
>> […]
>> Your approach is *junk*.  Because *again*, the *content* of the element
>> (scrollWidth/scrollHeight) does _not_ become wider or higher when I
>> scroll it right or down, so you MUST NOT add scrollTop or scrollLeft:
>>
>> [ASCII-Art: Element measures without and with scrolling]
>> 
>> See also:<http://msdn.microsoft.com/en-us/library/ms530302(VS.85).aspx>
> 
> You really don't seem to understand that a part of the content of a
> scrollable element may be hidden because it's wider and/or taller than
> the element's box.

No, *I* really do.  And −1 for full-quoting and still failing to understand 
what took me quite some time to get painted right:

  scrollWidth  != clientWidth + scrollLeft
  scrollHeight != clientHeight + scrollTop

> And that invisible part of the content cannot be
> measured with just element.clientHeight and element.clientWidth
> properties. If you want to get the element's content dimensions (not the
> box dimensions), you MUST USE (el.scrollTop + el.clientHeight) and
> (el.scrollLeft + el.clientWidth).

No, you MUST NOT use that because *inner dimensions* (i. e., that of the 
element's *content*) computed this way will vary depending on the element's 
scroll position, which is not measuring the inner dimensions *at all*.


Score adjusted

PointedEars
-- 
Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee

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David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-11-10 06:09 -0800
  Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "J.R." <groups_jr-1@yahoo.com.br> - 2011-11-10 16:57 -0200
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-11-10 11:54 -0800
  Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Ant" <not@home.today> - 2011-11-10 19:47 +0000
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-11-10 13:07 -0800
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Matt McDonald <matt@fortybelow.ca> - 2011-11-10 14:12 -0700
      Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-11-11 07:26 -0800
      Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 -   How to Measure Element Dimensions Frobernik <nospam@nospam.com> - 2011-11-17 22:43 +0000
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 16:08 -0800
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How   to Measure Element Dimensions Frobernik <nospam@nospam.com> - 2011-12-06 21:18 +0000
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-06 14:13 -0800
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Gene Wirchenko <genew@ocis.net> - 2011-11-10 13:17 -0800
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Evertjan." <exjxw.hannivoort@interxnl.net> - 2011-11-10 22:43 +0000
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Richard Cornford" <Richard@litotes.demon.co.uk> - 2011-11-11 00:36 +0000
      Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Gene Wirchenko <genew@ocis.net> - 2011-11-10 19:14 -0800
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Richard Cornford" <Richard@litotes.demon.co.uk> - 2011-11-11 09:59 +0000
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Gene Wirchenko <genew@ocis.net> - 2011-11-11 11:04 -0800
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-11-11 14:39 +0100
      Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-11-12 10:38 +0100
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Richard Cornford" <Richard@litotes.demon.co.uk> - 2011-11-12 19:19 +0000
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2011-11-12 21:07 +0100
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-11-13 00:42 +0100
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Richard Cornford" <Richard@litotes.demon.co.uk> - 2011-11-13 14:33 +0000
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2011-11-17 23:14 +0100
                Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Richard Cornford" <Richard@litotes.demon.co.uk> - 2011-11-17 23:55 +0000
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-11-13 20:22 +0100
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions RobG <rgqld@iinet.net.au> - 2011-11-13 08:29 +1000
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-11-13 20:25 +0100
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions RobG <rgqld@iinet.net.au> - 2011-11-13 23:05 -0800
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Tim Down <timdown@gmail.com> - 2011-11-14 03:41 -0800
                Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions RobG <rgqld@iinet.net.au> - 2011-11-16 16:18 -0800
                Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 16:03 -0800
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-11-15 16:52 +0100
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 15:54 -0800
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2011-11-13 10:38 +0200
  Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Dr J R Stockton <reply1145@merlyn.demon.co.uk> - 2011-11-11 21:33 +0000
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 15:00 -0800
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 18:38 -0800
      Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "J.R." <groups_jr-1@yahoo.com.br> - 2011-12-03 19:50 -0200
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-03 15:50 -0800
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-03 16:38 -0800
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-03 17:14 -0800
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-12-04 11:07 +0100
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-04 02:45 -0800
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-04 13:37 -0800
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-04 16:01 -0800
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-04 16:28 -0800
                Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-04 18:56 -0800
                Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions John G Harris <john@nospam.demon.co.uk> - 2011-12-05 14:39 +0000
                Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-05 11:00 -0800
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-03 19:17 -0800
  Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "J.R." <groups_jr-1@yahoo.com.br> - 2011-11-13 00:06 -0200
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-11-13 04:31 +0100
      Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "J.R." <groups_jr-1@yahoo.com.br> - 2011-11-13 13:44 -0200
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-11-13 18:35 +0100
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "J.R." <groups_jr-1@yahoo.com.br> - 2011-11-13 22:00 -0200
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-11-14 12:40 +0100
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions "J.R." <groups_jr-1@yahoo.com.br> - 2011-11-14 11:52 -0200
                Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-11-14 15:40 +0100
          Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2011-11-17 11:16 +0100
            Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-11-17 21:06 +0100
              Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2011-11-17 22:13 +0100
        Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 15:19 -0800
    Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 15:10 -0800
      Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions David Mark <dmark.cinsoft@gmail.com> - 2011-12-02 18:04 -0800

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