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Groups > comp.lang.javascript > #8794
| From | David Mark <dmark.cinsoft@gmail.com> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: David Mark's Javascript Tip Du Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions |
| Date | 2011-12-02 18:38 -0800 |
| Organization | http://groups.google.com |
| Message-ID | <24925190-dfd1-4c2c-a804-8b7fac1fc3ab@m10g2000vbc.googlegroups.com> (permalink) |
| References | <bd12b66f-33f5-43d2-8e22-6f81b42c3d8b@n14g2000vbn.googlegroups.com> <lKvGLxF5SZvOFwvl@invalid.uk.co.demon.merlyn.invalid> |
On Nov 11, 4:33 pm, Dr J R Stockton <reply1...@merlyn.demon.co.uk>
wrote:
>
> One Tip might be the answer to "I have an on-screen element, of known
> size, with an on[dbl]click method; how do I obtain the co-ordinates of a
> [double-]click with respect to a given position in the element itself?"
>
Tricky. :)
Your best bet is to see the tip of the day related to coordinates.
From that you should be able to get the coordinates of the element
relative to the viewport (or "window" as I think I referred to it in
that post). So you will need the mouse coordinates relative to the
viewport. Ironically enough, it's trivial to find those in the old IE
versions that lacked pageX/Y properties. But for everything else, you
have to have to subtract the scroll position as pageX/Y are relative
to the document. Depending on context, getting the scroll position is
either trivial (one-liner) or fairly complex. Frustratingly, it's IE
(all versions AFAIK) that needs most of the extra code in this case.
You also have to consider other factors like whether you will need
this to work in quirks mode (hopefully not)
It looks like:-
// No quirks mode, frames or other windows (just the one running the
script)
var getScrollPosition;
if ('number' == typeof window.pageXOffset) {
// Many "standards-based" browsers feature this non-standard
property
// No ambiguity about what this window property means
getScrollPosition = function() {
return [window.pageXOffset, window.pageYOffset];
};
} else if (document.documentElement && 'number' == typeof
document.documentElement.scrollTop) {
// Proprietary IE properties, copied widely by others; often 0,0 in
mobile browsers,
// Ambiguous as many mobiles represent an un-scrolled document (i.e.
scrollHeight == clientHeight), regardless of which portion of document
is viewable
getScrollPosition = function() {
return [document.documentElement.scrollLeft,
document.documentElement.scrollTop];
};
}
As usual, simplified feature detection (use isHost* functions) and
untested. Paste at your own risk.
One other thing, I wouldn't trust that you can get the mouse position
in a click or dblclick listener. Not sure what the standard
recommendation is, but I know I never retrieve the position from
anything but mousedown/move/up. ISTM that, at least traditionally,
that's all you can expect to work reliably. And by "work", I mean
across most browsers released this century. There's no way anything
like this can be considered cross-browser. There's at least a couple
of other pairs of properties where at least some mobiles insist on
stashing their "scroll" position (offsetLeft/Top comes to mind). So
there's at least one more prong and not based on any sort of logic,
just observation.
Needless to say, getting the "viewport" scroll position is something
to avoid whenever possible (most of the time). But as soon as you
start with the mouse position, at least for years to come, you
introduce that dependency.
Having said all of that, perhaps somebody out there who has actually
needed to tackle this problem has a cleaner, context-specific solution
that works in an acceptable subset of browsers. The big issue is that
there is no way to feature test the scroll position in advance, short
of actually setting the scroll position (which is clearly out of the
question).
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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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