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Re: removeEventListener why

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"Julio P. Di Egidio" <julio@diegidio.name> wrote on 07 Feb 2017 in
comp.lang.javascript: 

> "Andrew Poulos"  wrote in message 
> news:hbCdnUYE2rVRhQTFnZ2dnUU7-dvNnZ2d@westnet.com.au...
>>
>> If I use addEventListener on an element in the page should I then use 
>> removeEventListener before the page is unloaded?
>>
>> Is it good practice to remove all listeners I add or does it make no 
>> difference? I'm usually careful about removing all listeners I add but
>> I don't know if today it serves any real purpose.
>>
>> In the past I used to be worried about memory leaks. Is it still an
>> issue? 
> 
> Yes, you should destroy all event handlers before the page is unloaded, 
> browsers may, and AFAICT still do, leak memory otherwise.  There was an 
> article explaining the details which I cannot find now: it was about 
> orphaned references not getting automatically released... or something
> along that line.

No, you should not.

Any 'page' has so many listenters by default that you trust are destroyed 
when you leave the page, you could as well suspect a modern browser not 
keeping good care for that. btw, should you reset all variables before you 
exit a page too?

Memory-leakage is a task for the [individual browser]-maker to worry about, 
not for the page programmer.

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

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removeEventListener why Andrew Poulos <ap_prog@hotmail.com> - 2017-02-07 11:46 +1100
  Re: removeEventListener why "Julio P. Di Egidio" <julio@diegidio.name> - 2017-02-07 05:51 +0100
    Re: removeEventListener why "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-07 11:41 +0100
      Re: removeEventListener why Julio Di Egidio <julio@diegidio.name> - 2017-02-07 03:00 -0800
        Re: removeEventListener why "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-07 12:44 +0100
      Re: removeEventListener why JJ <jj4public@vfemail.net> - 2017-02-07 22:50 +0700
        Re: removeEventListener why "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-07 18:17 +0100
          Re: removeEventListener why JJ <jj4public@vfemail.net> - 2017-02-08 23:11 +0700
            Re: removeEventListener why "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-08 19:39 +0100
        Re: removeEventListener why Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-09 02:02 +0100
          Re: removeEventListener why Julio Di Egidio <julio@diegidio.name> - 2017-02-08 20:33 -0800
            Re: removeEventListener why "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-09 11:51 +0100
            Re: removeEventListener why Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-09 12:01 +0100
          Re: removeEventListener why JJ <jj4public@vfemail.net> - 2017-02-09 18:36 +0700
            Re: removeEventListener why Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-09 13:09 +0100
  Re: removeEventListener why "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-02-07 06:32 -0800
    Re: removeEventListener why Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-07 17:31 +0100
      Re: removeEventListener why Julio Di Egidio <julio@diegidio.name> - 2017-02-07 11:59 -0800
        Re: removeEventListener why Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-07 21:55 +0100
          Re: removeEventListener why Julio Di Egidio <julio@diegidio.name> - 2017-02-07 13:23 -0800
            Re: removeEventListener why "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-02-08 06:03 -0800
      Re: removeEventListener why "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-02-08 05:54 -0800

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