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Groups > comp.lang.javascript > #31382

Re: Differentiate between touch start and click

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Andrew Poulos <ap_prog@hotmail.com> writes:

> I have a touchstart event and a click event both triggering this function
>
> function checkTrigger(e){
>   if (e.type != "click") {
>     e = e.touches[0];
>   }
>
>   var elem = document.elementFromPoint(e.pageX - window.pageXOffset,
>                                        e.pageY - window.pageYOffset);
>   ...
> }
>
> To tell whether it was a touchstart or a click I'm using
>   (e.type != "click")
> is that the right way to differentiate between the two or should I
> have two smaller functions (one for each event) which then pass on the
> relevant values to checkTrigger?

I don't think it matters much but I would, in general, make the test
positive (logically you are doing something when it's a touch event, not
when it isn't a click event).  Indeed, you might even want to test for
the touches property itself.

I'd be more concerned about the pageX/pageY stuff which is not
standardised (though I may be behind the times on that).  You usually
get the target element using "e.target" and "this" will usually refer to
the element to which the listener was added.

-- 
Ben.

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Thread

Differentiate between touch start and click Andrew Poulos <ap_prog@hotmail.com> - 2016-09-16 18:26 +1000
  Re: Differentiate between touch start and click Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-09-16 11:25 +0100
  Re: Differentiate between touch start and click Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-17 00:06 +0200
    Re: Differentiate between touch start and click Andrew Poulos <ap_prog@hotmail.com> - 2016-09-18 19:25 +1000

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