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ontouchstart and iOS

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  ontouchstart and iOS Andrew Poulos <ap_prog@hotmail.com> - 2011-11-08 13:33 +1100
    Re: ontouchstart and iOS Andrew Poulos <ap_prog@hotmail.com> - 2011-11-08 14:22 +1100
      Re: ontouchstart and iOS David Mark <dmark.cinsoft@gmail.com> - 2011-11-08 03:26 -0800
    Re: ontouchstart and iOS David Mark <dmark.cinsoft@gmail.com> - 2011-11-08 03:13 -0800

#8119 — ontouchstart and iOS

I've set this handler

window.ontouchstart = myFunc;

and it triggers on iOS 5 devices but seems to be ignored on iOS 4 
devices. I don't get any errors it just seems to be ignored. Attaching 
ontouchstart to BODY gets ignored by both iOS 4 and 5.

Is there a reliable way to get iOS to recognise ontouchstart anywhere on 
the page?

Andrew Poulos

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#8120

On 8/11/2011 1:33 PM, Andrew Poulos wrote:
> I've set this handler
>
> window.ontouchstart = myFunc;
>
> and it triggers on iOS 5 devices but seems to be ignored on iOS 4
> devices. I don't get any errors it just seems to be ignored. Attaching
> ontouchstart to BODY gets ignored by both iOS 4 and 5.
>
> Is there a reliable way to get iOS to recognise ontouchstart anywhere on
> the page?

I'm now testing

document.ontouchstart = myFunc;

and

document.documentElement.ontouchstart = myFunc;

and both seem to work. Alas I don't understand why 'window' partly 
works, 'body' fails, and 'document' works.

Andrew Poulos

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#8125

On Nov 7, 10:22 pm, Andrew Poulos <ap_p...@hotmail.com> wrote:
> On 8/11/2011 1:33 PM, Andrew Poulos wrote:
>
> > I've set this handler
>
> > window.ontouchstart = myFunc;
>
> > and it triggers on iOS 5 devices but seems to be ignored on iOS 4
> > devices. I don't get any errors it just seems to be ignored. Attaching
> > ontouchstart to BODY gets ignored by both iOS 4 and 5.
>
> > Is there a reliable way to get iOS to recognise ontouchstart anywhere on
> > the page?
>
> I'm now testing
>
> document.ontouchstart = myFunc;

Unlike with window, I would expect that to work. I don't use document
for that either, so can't confirm.

>
> and
>
> document.documentElement.ontouchstart = myFunc;

Certainly that should work, though you'd think body would as well.

>
> and both seem to work. Alas I don't understand why 'window' partly
> works, 'body' fails, and 'document' works.

Can't imagine why body would fail in either version. Could be a bug.
You might ask Apple about it.

If I were looking into it, I'd set the ontouchstart attribute of the
body and look at the ontouchstart property. I assume it will be a
function. Also, does setting a global (or window) ontouchstart
property change the body (a la onload), perhaps that version of iOS
has some wires crossed behind the scenes.

If it turns out to be an undetectable bug, the only thing you can do
is avoid it (which shouldn't be hard in this case).

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#8124

On Nov 7, 9:33 pm, Andrew Poulos <ap_p...@hotmail.com> wrote:
> I've set this handler
>
> window.ontouchstart = myFunc;

The window object is virtually always the worst bet. There's never
been any standard for it. Though the HTML5 recommendation finally
mentions it, it hardly matters at this point.

>
> and it triggers on iOS 5 devices but seems to be ignored on iOS 4
> devices. I don't get any errors it just seems to be ignored.


> Attaching
> ontouchstart to BODY gets ignored by both iOS 4 and 5.

I don't attach touch listeners to the body, but would find it odd if
it didn't work like other elements.

>
> Is there a reliable way to get iOS to recognise ontouchstart anywhere on
> the page?

Every version on every object?  Probably not.  If you are going to
mess with those events, best to make the feature an optional
enhancement.

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