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Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas"

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=?UTF-8?Q?Jonas_Th=C3=B6rnvall?= <jonas.thornvall@gmail.com> wrote on 29
Oct 2019 in comp.lang.javascript: 

> I thought that when you refered to something by get elementById it was
> part of HTML DOM-object. 

You did, I didn't.

> Well i tried to add the listener to ctm first but it said not defined,

You can only add a listener to a/some DOM element, so you can first use the 
debugger to see if ctm points to the element you think it points to.

> although it just was defined right above the code that added the
> listener.

If it says "not defined" I would assume it was not defined,
so do some testing. 

===========

Perhaps some DOM-elements do not allow a listener.

I can imagine <br> doesn't and <title></title> doesn't,
but <script> could. Maybe that is even implmentation-dependent.


-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" Jonas Thörnvall <jonas.thornvall@gmail.com> - 2019-10-29 02:18 -0700
  Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2019-10-29 10:42 +0100
    Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" Jonas Thörnvall <jonas.thornvall@gmail.com> - 2019-10-29 03:07 -0700
      Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2019-10-29 11:32 +0100
        Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" Jonas Thörnvall <jonas.thornvall@gmail.com> - 2019-10-29 06:10 -0700
          Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2019-10-29 23:11 +0100
            Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" Jonas Thörnvall <jonas.thornvall@gmail.com> - 2019-10-29 23:18 -0700
              Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" luserdroog <luser.droog@gmail.com> - 2019-10-30 00:10 -0700
                Re: Where does it make sense to put the mouseOver "canvas" mouseOut "canvas" Jonas Thörnvall <jonas.thornvall@gmail.com> - 2019-10-30 01:01 -0700

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