1298825 - preventDefault doesn't work on simulated touch events

Status: RESOLVED FIXED

(DevTools :: Responsive Design Mode, defect, P3)

Description

[Pierre Ossman]

User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:47.0) Gecko/20100101 Firefox/47.0
Build ID: 20160606100313

Steps to reproduce:

1. Enabled responsive design mode
2. Enabled "simulate touch events"
3. Clicked an element that had this handler for both 'mousedown' and 'touchstart':

    handler: function(e) {
        e.preventDefault();
    }


Actual results:

The handler fired twice, once for 'touchstart' and once for 'mousedown'.


Expected results:

The handler should just have fired once, for 'touchstart'.

Comment 1

[Pierre Ossman]

See also bug 977226 which seems to have fixed this for real touch events (as opposed to simulated ones).

Comment 2

[Loic]

jryans, could you NI someone who is in charge of the API about simulating touch events.

Comment 3

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

I agree this appears to be missing from the current touch simulation support.  We could either extend the existing simulator (some JS that manually fires events) or resolve this via bug 1282089 which would use the platform's native touch support more directly.

Comment 4

[Micah [:mtigley] (she/her)]

Fixed by Bug 1623941