697002 - Feature detection using window.ontouchstart/.ontouchend/etc. does not work

Status: RESOLVED DUPLICATE of bug 659350

(Firefox for Android Graveyard :: General, defect)

Description

[Séamus O'Connor]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:9.0a2) Gecko/20111024 Firefox/9.0a2
Build ID: 20111024042025

Steps to reproduce:

Tried to use JS to test for presence of 'touchstart', 'touchmove' or 'touchend' events on window, document or any HTML element.


Actual results:

'ontouchstart' in window is false
'ontouchmove' in window is false
'ontouchstart' in window is false

'ontouchstart' in document is false
'ontouchmove' in document is false
'ontouchstart' in document is false

'ontouchstart' in document.body is false
'ontouchmove' in document.body is false
'ontouchstart' in document.body is false


Expected results:

http://perfectionkills.com/detecting-event-support-without-browser-sniffing/

Comment 1

[Matt Brubeck (:mbrubeck)]

We'll have to make sure these properties are present only when the "dom.w3c_touch_events.enabled" preferences is true.  Smaug, can you point me to the right way to do this?  (Or feel free to steal this bug if you have time to work on it.)

Comment 2

[Matt Brubeck (:mbrubeck)]

Note: For now, you can detect touch event support in Firefox and other browsers with this test: ("createTouch" in document)

Comment 3

[Matt Brubeck (:mbrubeck)]

It looks like this is already fixed in Firefox 9 by bug 659350, which also made the same type of feature detection work for other events, like: ("onclick" in document)