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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Move a div with mouse
Date: Sat, 25 Jul 2015 14:07:28 +0200
Organization: PointedEars Software (PES)
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danca (Daniele Campagna) wrote:

> Il 07/24/2015 08:36 PM, Thomas 'PointedEars' Lahn ha scritto:
>> danca (Daniele Campagna) wrote:
>
> […]
> I TRIED to copy-and-paste and then to adjust the [horrible] result.

I think you know what to do now.

> So it is not correct to infer[It exists? I mean make a deduction] that
> if document.addEventListener does not exist <something>.addEventListener
> couldn't instead exist?

Yes.

> Hummmmm...
> (Ubi major minus cessat).

_maior_

>>> […]
>>>     }else{ alert("no event")// just in case}
>>
>> This may be a syntax error.  Your code is so unreadable that it is
>> difficult to tell without copying and reformatting it.
>>
>>>     document.onmouseup = function() {
>>>      document.onmousemove = null;
>>>      document.onmouseup = null;
>>>     }
>>
>> Nonsense.
> 
> Ehm... it should cancel the event listeners - and it seems to work in IE
> and FF. What's wrong with canceling eventListeners that simple way?

*Events* are canceled, not event listeners.

You are defining and _undefining_ event listeners here.  It makes no sense 
to define/*overwrite* an event listener for an event, that may not have been 
defined in the first place, just to undefine it when the event is fired.

-- 
PointedEars
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