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Re: removing event listener

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From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.javascript
Subject Re: removing event listener
Date Mon, 11 Oct 2021 16:42:22 +0100
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Andrew Poulos <ap_prog@hotmail.com> writes:

> I Have this
>
> Interaction = function() {
>  ...
> };
>
> Interaction.prototype.action = function() {
>   let me = this;
>   ...
>   document.addEventListener('keydown', me.action.bind(me));
> };
>
> Interaction.prototype.reaction = function() {
>   let me = this;
>   ...
>   document.removeEventListener('keydown', me.action.bind(me));
> };
>
> but when 'reaction' gets called the 'keydown' event listener doesn't
> get removed. How can I remove the event listener within 'reaction'?

bind creates a new anonymous function but you can only remove an event
function by passing in the exact same function you passed when calling
addEventListener.  You'll have to store that function value somewhere.

-- 
Ben.

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Thread

removing event listener Andrew Poulos <ap_prog@hotmail.com> - 2021-10-11 10:37 +1100
  Re: removing event listener Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-10-11 16:42 +0100
    Re: removing event listener Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2021-10-12 22:43 +0200
  Re: removing event listener Julio Di Egidio <julio@diegidio.name> - 2021-10-11 09:46 -0700
    Re: removing event listener JJ <jj4public@gmail.com> - 2021-10-12 22:21 +0700
      Re: removing event listener Julio Di Egidio <julio@diegidio.name> - 2021-10-12 09:57 -0700
    Re: removing event listener John Harris <niam@jghnorth.org.uk.invalid> - 2021-10-12 18:13 +0100
      Re: removing event listener Julio Di Egidio <julio@diegidio.name> - 2021-10-12 16:05 -0700
        Re: removing event listener John Harris <niam@jghnorth.org.uk.invalid> - 2021-10-13 18:10 +0100
    Re: removing event listener John Harris <niam@jghnorth.org.uk.invalid> - 2021-10-12 18:15 +0100
  Re: removing event listener Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2021-10-12 22:55 +0200

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