Re: detect a phone

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From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups	comp.lang.javascript
Subject	Re: detect a phone
Date	Sun, 27 Aug 2017 03:33:35 +0200
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Andrew Poulos wrote:

> I've got a situation where it would be beneficial to know if the js is
> running on a phone and I thought "instead of parsing navigator.userAgent
> why not just check for the window screen size?"

First of all, because that is an oxymoron.  What is “window screen size” 
supposed to mean?  In a windowing system, windows are displayed on the 
screen, or more precisely on a desktop (area).  There is a *window* size, 
and a *screen* (precisely: desktop) size.

Second, none of them have anything to do with whether a Web application is 
running on a mobile device (smartphone or tablet): On a desktop PC or 
laptop/notebook, I can have a smaller window size for *any* reason – most 
importantly, cascaded or tiled window arrangement.  With virtual desktops, 
I can also have a "screen" (_desktop_) smaller than the display resolution.  
(This feature is now available on mobile devices, too, with standard 
firmware.)

Display resolution != desktop size != browser window size != viewport size. 
[psf 3.7]

> Currently no phone's viewport is larger than 600, in both width and
> height, so for the time being would something like
> 
> var isPhone = (window.screen.width < 600 || window.screen.height < 600)
> && ("ontouchstart" in window);
> 
> be a "safe" way test?

No.

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | <http://PointedEars.de/es-matrix>
<https://github.com/PointedEars> | <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | Please do not cc me./Bitte keine Kopien per E-Mail.

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Thread

detect a phone Andrew Poulos <ap_prog@hotmail.com> - 2017-08-26 19:23 +1000
  Re: detect a phone "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-08-26 11:44 +0200
    Re: detect a phone Andrew Poulos <ap_prog@hotmail.com> - 2017-08-27 00:09 +1000
      Re: detect a phone "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-08-26 20:02 +0200
  Re: detect a phone Richard Maher <maher_rjSPAMLESS@hotmail.com> - 2017-08-26 20:42 +0800
  Re: detect a phone "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-08-26 09:40 -0700
    Re: detect a phone Andrew Poulos <ap_prog@hotmail.com> - 2017-08-27 08:48 +1000
      Re: detect a phone "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-08-26 16:31 -0700
      Re: detect a phone Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-27 03:35 +0200
  Re: detect a phone JJ <jj4public@vfemail.net> - 2017-08-27 00:03 +0700
    Re: detect a phone Andrew Poulos <ap_prog@hotmail.com> - 2017-08-27 08:21 +1000
      Re: detect a phone Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-27 04:00 +0200
        Re: detect a phone Andrew Poulos <ap_prog@hotmail.com> - 2017-08-27 18:13 +1000
          Re: detect a phone Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-27 15:15 +0200
    Re: detect a phone Mark Lloyd <not@mail.invalid> - 2017-08-27 11:30 -0500
  Re: detect a phone Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-27 03:33 +0200

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